From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Fri Feb 2 08:10:28 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id IAA07386 for ; Fri, 2 Feb 2001 08:10:27 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id DAA09667 for ; Fri, 2 Feb 2001 03:53:21 -0800 (PST) From: homeloan1006@aol.com Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f12BrBh11881 for ; Fri, 2 Feb 2001 03:53:11 -0800 (PST) Received: from www.amcc.com.cn ([202.102.193.110]) by proxy3.cisco.com (8.11.2/8.11.2) with SMTP id f12Br4s21670 for ; Fri, 2 Feb 2001 03:53:04 -0800 (PST) Received: (qmail 16275 invoked by uid 101); 1 Feb 2001 01:55:53 -0000 Received: from unknown (HELO aol.com) (unknown) by unknown with SMTP; 1 Feb 2001 01:55:53 -0000 Subject: Buying a home? Self employed? Hard to qualify? 1326 Date: Wed, 31 Jan 2001 20:40:38 Message-Id: <597.11206.798128@aol.com> Reply-To: homeloan013101@aol.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" WE SOLVE MORTGAGE PROBLEMS !!! Specializing in loans for exceptional people Self-Employed Borrowers No Income or Asset Verification All Levels of Credit Quality Up to 100% Financing High Debt Ratios Non-Owner Occupied Properties Renovation Plus Purchase and Refinance $UPER $OLUTION$ ......... $UPER RE$ULT$ If you would like additional information please email us at wed1111@excite.com?Subject=MoreInformation Help a family member or a friend with their home loan needs by FORWARDING THIS EMAIL TO THEM! An Equal Housing Opportunity Lender If you wish to be removed from this advertiser's future mailings, please reply with the subject "Remove" and this software will automatically block you from their future mailings. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Sat Feb 3 00:20:02 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id AAA15998 for ; Sat, 3 Feb 2001 00:20:01 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id UAA27501 for ; Fri, 2 Feb 2001 20:15:43 -0800 (PST) From: hgrant@itio.net Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f134FUE15353 for ; Fri, 2 Feb 2001 20:15:30 -0800 (PST) Received: from mailer1.domain.com (HSE-Ottawa-ppp159137.sympatico.ca [64.229.137.30]) by proxy3.cisco.com (8.11.2/8.11.2) with SMTP id f134FRg22393 for ; Fri, 2 Feb 2001 20:15:28 -0800 (PST) To: Date: Fri, 2 Feb 2001 19:41:19 Message-Id: <752.54053.729756@mailer1.domain.com> Subject: New Year Millionaire! Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Dear Friends & Future Millionaire: AS SEEN ON NATIONAL TV: Making over half million dollars every 4 to 5 months right from your home !! THANK'S TO THE COMPUTER AGE AND THE INTERNET ! ================================================== BE A MILLIONAIRE LIKE OTHERS WITHIN A YEAR!!! Before you say ''Bull'', please read the following. This is the letter you have been hearing about on the news lately. Due to the popularity of this letter on the Internet, a national weekly news program recently devoted an entire show to the investigation of this program described below, to see if it really can make people money. The show also investigated whether or not the program was legal. Their findings proved once and for all that there are ''absolutely NO Laws prohibiting the participation in the program and if people can -follow the simple instructions, they are bound to make some mega bucks with only $25 out of pocket cost''. DUE TO THE RECENT INCREASE OF POPULARITY & RESPECT THIS PROGRAM HAS ATTAINED, IT IS CURRENTLY WORKING BETTER THAN EVER. This is what one had to say: ''Thanks to this profitable opportunity. I was approached many times before but each time I passed on it. I am so gladI finally joined just to see what one could expect in return for the minimal effort and money required. To my astonishment, I received total $610,470.00 in 21 weeks, with money still coming in." Pam Hedland, Fort Lee, New Jersey. =================================================== Here is another testimonial: "This program has been around for a long time but I never believed in it. But one day when I received this again in the mail I decided to gamble my $25 on it. I followed the simple instructions and walaa ..... 3 weeks later the money started to come in. First month I only made $240.00 but the next 2 months after that I made a total of $290,000.00. So far, in the past 8 months by re-entering the program, I have made over $710,000.00 and I am playing it again. The key to success in this program is to follow the simple steps and NOT change anything.'' More testimonials later but first, ===== PRINT THIS NOW FOR YOUR FUTUREREFERENCE ====== $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ If you would like to make at least $500,000 every 4 to 5 months easily and comfortably, please read the following...THEN READ IT AGAIN and AGAIN!!! $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ FOLLOW THE SIMPLE INSTRUCTION BELOW AND YOUR FINANCIAL DREAMS WILL COME TRUE, GUARANTEED! INSTRUCTIONS: =====Order all 5 reports shown on the list below ===== For each report, send $5 CASH, THE NAME & NUMBER OF THE REPORT YOU ARE ORDERING and YOUR E-MAIL ADDRESS to the person whose name appears ON THAT LIST next to the report. MAKE SURE YOUR RETURN ADDRESS IS ON YOUR ENVELOPE TOP LEFT CORNER in case of any mail problems. === When you place your order, make sure you order each of the 5 reports. You will need all 5 reports so that you can save them on your computer and resell them. YOUR TOTAL COST $5 X 5=$25.00. Within a few days you will receive, vie e-mail, each of the 5 reports from these 5 different individuals. Save them on your computer so they will be accessible for you to send to the 1,000's of people who will order them from you. Also make a floppy of these reports and keep it on your desk in case something happen to your computer. IMPORTANT - DO NOT alter the names of the people who are listed next to each report, or their sequence on the list, in any way other than what is instructed below in step '' 1 through 6 '' or you will loose out on majority of your profits. Once you understand the way this works, you will also see how it does not work if you change it. Remember, this method has been tested, and if you alter, it will NOT work !!! People have tried to put their friends/relatives names on all five thinking they could get all the money. But it does not work this way. Believe us, we all have tried to be greedy and then nothing happened. So Do Not try to change anything other than what is instructed. Because if you do, it will not work for you. Remember, honesty reaps the reward!!! 1.... After you have ordered all 5 reports, take this advertisement and REMOVE the name & address of the person in REPORT # 5. This person has made it through the cycle and is no doubt counting their fortune. 2.... Move the name & address in REPORT # 4 down TO REPORT # 5. 3.... Move the name & address in REPORT # 3 down TO REPORT # 4. 4.... Move the name & address in REPORT # 2 down TO REPORT # 3. 5.... Move the name & address in REPORT # 1 down TO REPORT # 2 6.... Insert YOUR name & address in the REPORT # 1 Position. PLEASE MAKE SURE you copy every name & address ACCURATELY! ========================================================== **** Take this entire letter, with the modified list of names, and save it on your computer. DO NOT MAKE ANY OTHER CHANGES. Save this on a disk as well just in case if you loose any data. To assist you with marketing your business on the internet, the 5 reports you purchase will provide you with invaluable marketing information which includes how to send bulk e-mails legally, where to find thousands of free classified ads and much more. There are 2 Primary methods to get this venture going: METHOD # 1: BY SENDING BULK E-MAIL LEGALLY ========================================================== Let's say that you decide to start small, just to see how it goes, and we will assume You and those involved send out only 5,000 e-mails each. Let's also assume that the mailing receive only a 0.2% response (the response could be much better but lets just say it is only 0.2%. Also many people will send out hundreds of thousands e-mails instead of only 5,000 each). Continuing with this example, you send out only 5,000 e-mails. With a 0.2% response, that is only 10 orders for report # 1. Those 10 people responded by sending out 5,000 e-mail each for a total of 50,000. Out of those 50,000 e-mails only 0.2% responded with orders. That's=100 people responded and ordered Report # 2. Those 100 people mail out 5,000 e-mails each for a total of 500,000 e-mails. The 0.2% response to that is 1000 orders for Report # 3. Those 1000 people send out 5,000 e-mails each for a total of 5 million e-mails sent out. The 0.2% response to that is 10,000 orders for Report # 4. Those 10,000 people send out 5,000 e-mails each for a total of 50,000,000 (50 million) e-mails. The 0.2% response to that is 100,000 orders for Report # 5 THAT'S 100,000 ORDERS TIMES $5 EACH=$500,000.00 (half million). Your total income in this example is: 1..... $50 + 2..... $500 + 3..... $5,000 + 4 .... $50,000 + 5..... $500,000 ........ Grand Total=$555,550.00 NUMBERS DO NOT LIE. GET A PENCIL & PAPER AND FIGUREOUT THE WORST POSSIBLE RESPONSES AND NO MATTER HOW YOU CALCULATE IT, YOU WILL STILL MAKE A LOT OF MONEY ! ========================================================= REMEMBER FRIEND, THIS IS ASSUMING ONLY 10 PEOPLE ORDERING OUT OF 5,000 YOU MAILED TO. Dare to think for a moment what would happen if everyone or half or even one 4th of those people mailed 100,000e-mails each or more? There are over 150 million people on the Internet worldwide and counting. Believe me, many people will do just that, and more! METHOD # 2 : BY PLACING FREE ADS ON THE INTERNET ======================================================= Advertising on the net is very very inexpensive and there are hundreds of FREE places to advertise. Placing a lot of free ads on the Internet will easily get a larger response. We strongly suggest you start with Method # 1 and dd METHOD # 2 as you go along. For every $5 you receive, all you must do is e-mail them the Report they ordered. That's it. Always provide same day service on all orders. This will guarantee that the e-mail they send out, with your name and address on it, will be prompt because they can not advertise until they receivethe report. =========== AVAILABLE REPORTS ==================== ORDER EACH REPORT BY ITS NUMBER & NAME ONLY. Notes: Always send $5 cash (U.S. CURRENCY) for each Report. Checks NOT accepted. Make sure the cash is concealed by wrapping it in at least 2 sheets of paper. On one of those sheets of paper, Write the NUMBER & the NAME of the Report you are ordering, YOUR E-MAIL ADDRESS and your name and postal address. PLACE YOUR ORDER FOR THESE REPORTS NOW : ==================================================== REPORT # 1: "The Insider's Guide to Advertising for Free on the Net" Order Report #1 from: S. Cranke 1503-1500 Walkley Rd Ottawa, ON K1V 0H8 Canada ___________________________________________________________ REPORT # 2: "The Insider's Guide to Sending Bulk e-mail on the Net" Order Report # 2 from: T. Richardson P.O. Box 753 Richland, MO. 65556 USA ____________________________________________________________ REPORT # 3: "Secret to Multilevel Marketing on the Net" Order Report # 3 from : C.J. Kalata P.O. Box 130157 Roseville, MN 55113-0002 USA ____________________________________________________________ REPORT # 4: "How to Become a Millionaire Utilizing MLM & the Net" Order Report # 4 from: R. B. Box. 21115, Grande Prairie Alberta, T8V-6W7 Canada ____________________________________________________________ REPORT #5: "How to Send Out 0ne Million e-mails for Free" Order Report # 5 from: B. Taylor P.O.Box 26001 Fredericton, N.B. E3A 5V8 Canada _____________________________________________________________ $$$$$$$$$ YOUR SUCCESS GUIDELINES $$$$$$$$$$$ Follow these guidelines to guarantee your success: === If you do not receive at least 10 orders for Report #1 within 2 weeks, continue sending e-mails until you do. === After you have received 10 orders, 2 to 3 weeks after that you should receive 100 orders or more for REPORT # 2. If you did not, continue advertising or sending e-mails until you do. === Once you have received 100 or more orders for Report # 2, YOU CAN RELAX, because the system is already working for you, and the cash will continue to roll in ! THIS IS IMPORTANT TO REMEMBER: Every time your name is moved down on the list, you are placed in front of a Different report. You can KEEP TRACK of your PROGRESS by watching which report people are ordering from you. IF YOU WANT TO GENERATE MORE INCOME SEND ANOTHER BATCH OF E-MAILS AND START THE WHOLE PROCESS AGAIN. There is NO LIMIT to the income you can generate from this business !!! ====================================================== FOLLOWING IS A NOTE FROM THE ORIGINATOR OF THIS PROGRAM: You have just received information that can give you financial freedom for the rest of your life, with NO RISK and JUST A LITTLE BIT OF EFFORT. You can make more money in the next few weeks and months than you have ever imagined. Follow the program EXACTLY AS INSTRUCTED. Do Not change it in any way. It works exceedingly well as it is now. Remember to e-mail a copy of this exciting report after you have put your name and address in Report #1 and moved others to #2 ..........# 5 as instructed above. One of the people you send this to may send out 100,000 or more e-mails and your name will be on every one of them. Remember though, the more you send out the more potential customers you will reach. So my friend, I have given you the ideas, information, materials and opportunity to become financially independent. IT IS UP TO YOU NOW ! ============ MORE TESTIMONIALS ================ "My name is Mitchell. My wife, Jody and I live in Chicago. I am an accountant with a major U.S. Corporation and I make pretty good money. When I received this program I grumbled to Jodyaboutreceiving ''junk mail''. I made fun of the whole thing,spoutingmy knowledge of the population and percentages involved. I ''knew'' it wouldn't work. Jody totally ignored my supposed intelligence and few days later she jumped in with both feet. I made merciless fun of her, and was ready to lay the old ''I told you so'' on her when the thing didn't work. Well, the laugh was on me! Within 3 weeks she had received 50 responses. Within the next 45 days she had received total $ 147,200.00 ........... all cash! I was shocked. I have joined Jody in her ''hobby''. Mitchell Wolf M.D., Chicago, Illinois ====================================================== ''Not being the gambling type, it took me several weeks to make up my mind to participate in this plan. But conservative that I am, I decided that the initial investment was so little that there was just no way that I wouldn't get enough orders to at least get my money back''. '' I was surprised when I found my medium size post office box crammed with orders. I made $319,210.00in the first 12 weeks. The nice thing about this deal is that it does not matter where people live. There simply isn't a better investment with a faster return and so big." Dan Sondstrom, Alberta, Canada ======================================================= ''I had received this program before. I deleted it, but later I wondered if I should have given it a try. Of course, I had no idea who to contact to get another copy, so I had to wait until I was e-mailed again by someone else.........11 months passed then it luckily came again...... I did not delete this one! I made more than $490,000 on my first try and all the money came within 22 weeks." Susan De Suza, New York, N.Y. ======================================================= ''It really is a great opportunity to make relatively easy money with little cost to you. I followed the simple instructions carefully and within 10 days the money started to come in. My first month I made $20,560.00 and by the end of third month my total cash count was $362,840.00. Life is beautiful, Thanx to internet.". Fred Dellaca, Westport, New Zealand ======================================================= ORDER YOUR REPORTS TODAY AND GET STARTED ON 'YOUR' ROAD TO FINANCIAL FREEDOM ! ======================================================= If you have any questions of the legality of this program, contact the Office of Associate Director for Marketing Practices, Federal Trade Commission, Bureau of Consumer Protection, Washington, D.C. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Mon Feb 5 06:47:10 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id GAA03377 for ; Mon, 5 Feb 2001 06:47:09 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id CAA04708 for ; Mon, 5 Feb 2001 02:52:48 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f15AaUq05727 for ; Mon, 5 Feb 2001 02:36:32 -0800 (PST) Received: from relay1.alcatel.be (alc119.alcatel.be [195.207.101.119]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f15AaBM28621 for ; Mon, 5 Feb 2001 02:36:11 -0800 (PST) Received: from Bemail06.net.alcatel.be (localhost [127.0.0.1]) by relay1.alcatel.be (8.10.1/8.10.1) with SMTP id f15ALQD00873; Mon, 5 Feb 2001 11:21:26 +0100 (MET) Received: from alcatel.be ([138.203.65.20]) by Bemail06.net.alcatel.be (Lotus SMTP MTA v4.6.7 (934.1 12-30-1999)) with SMTP id C12569EA.0038E360; Mon, 5 Feb 2001 11:21:22 +0100 Message-ID: <3A7E7E28.F319258B@alcatel.be> Date: Mon, 05 Feb 2001 11:19:20 +0100 From: Dirk Ooms X-Mailer: Mozilla 4.61 [en] (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: "ssm-interest@external.cisco.com" , "maddogs@ietf.org" Subject: multicast-transition Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Hi all, I was wondering whether anyone ever considered to apply techniques, similar to the ones defined in ngtrans for ipv6, to ip multicast. At the moment one needs to configure static tunnels to connect to the MBone over a non-multicast network. Wouldn't it be good to investigate how senders and/or receivers can hook up automatically to the MBone (without the requirement of somebody in the MBone configuring a tunnel to your network). So, the concept of tunnel brokers might be useful: potential senders or receivers can request a tunnel to a tunnel broker. This requires some boxes at the border of the MBone that are willing to encapsulate/decapsulate, possibly take the role of DR (maybe one can find broadcasters that want to sponsor such boxes). Automatic tunneling might be another mechanism helping the deployment of multicast. In SSM, one could consider mechanisms as the following one (I know it impacts the current model, but I think it's also pretty cool, so maybe someone else might come up with variants that diminish the impact): At the SSM meeting in Pittsburg Doron Rajwan presented the idea to extend IGMP to enable SSM-senders to check whether there are any receivers for their data. As an alternative one could consider to terminate the PIM messages on the senders themselves (this would be a scaled down PIM-stub with very limited functionality). Once this principle of terminating PIM at the SSM-sender would be accepted, one can easily create automatic tunnels: again a number of special boxes are placed at the border of the MBone, which will inject a default route into the Mbone (the MRIBs will have a default route). So (S,G) PIM Joins with an S that is not part of the multicast topology will follow the default route and will end up in this special border box. The box consults its RIB and tunnels the PIM Join to the sender S. By looking at the source of the outer IP header the sender knows where it has to tunnel its multicast data to. The above mechanism would allow that anyone can send to the MBone by just downloading an application (no need to have a multicast router or to configure a tunnel). In ISM it was required that a sender sends its data to the DR of the sender to be able to be discovered by the receivers (via flooding or via an RP), but in SSM this is not necessary anymore since out-of-band signaling is used. In ngtrans there is another group of mechanisms beside tunneling, which are the translators. This could be another topic to investigate: how can a unicast-only host hook up to a multicast distribution via a special translator box. Any comment? dirk -- Dirk Ooms mailto:dirk.ooms@alcatel.be tel:+32 3 2404732 Network Strategy Group (NSG) http://www.rc.bel.alcatel.be/nsg Alcatel http://www.alcatel.com From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Mon Feb 5 09:11:25 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id JAA06098 for ; Mon, 5 Feb 2001 09:11:24 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id FAA23530 for ; Mon, 5 Feb 2001 05:07:13 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f15D7At08564 for ; Mon, 5 Feb 2001 05:07:10 -0800 (PST) Received: from bells.cs.ucl.ac.uk (bells.cs.ucl.ac.uk [128.16.5.31]) by proxy3.cisco.com (8.11.2/8.11.2) with SMTP id f15D79x19623 for ; Mon, 5 Feb 2001 05:07:10 -0800 (PST) Received: from hocus.cs.ucl.ac.uk by bells.cs.ucl.ac.uk with local SMTP id ; Mon, 5 Feb 2001 13:01:40 +0000 To: Dirk Ooms cc: "ssm-interest@external.cisco.com" , "maddogs@ietf.org" Subject: Re: multicast-transition In-reply-to: Your message of "Mon, 05 Feb 2001 11:19:20 +0100." <3A7E7E28.F319258B@alcatel.be> Date: Mon, 05 Feb 2001 13:01:39 +0000 Message-ID: <1459.981378099@cs.ucl.ac.uk> From: Jon Crowcroft In message <3A7E7E28.F319258B@alcatel.be>, Dirk Ooms typed: >>In ngtrans there is another group of mechanisms beside tunneling, which >>are the translators. This could be another topic to investigate: how >>can a unicast-only host hook up to a multicast distribution via a >>special translator box. >>Any comment? dirk 1/ you may need to consider load balancing the tunnel brokers - this can be complex 2/ you will need to consider policy at the tunnel brokers (the same reason an ISP might not want multicast is why they wont be too fond of peope running tunnel brokers in the next door isp... 3/ see REUNITE (recursive unicast multicast ) from CMU as an approach to some of this... otherwise, i think it might be a nice idea... cheers jon From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Mon Feb 5 09:12:09 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id JAA06112 for ; Mon, 5 Feb 2001 09:12:08 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id FAA08944 for ; Mon, 5 Feb 2001 05:12:26 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f15DCD410404 for ; Mon, 5 Feb 2001 05:12:13 -0800 (PST) Received: from mailhub.fokus.gmd.de (mailhub.fokus.gmd.de [193.174.154.14]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f15DCCx21012 for ; Mon, 5 Feb 2001 05:12:13 -0800 (PST) Received: from dumbo.fokus.gmd.de (dumbo [193.175.132.239]) by mailhub.fokus.gmd.de (8.8.8/8.8.8) with ESMTP id NAA06764; Mon, 5 Feb 2001 13:59:28 +0100 (MET) Received: (from mis@localhost) by dumbo.fokus.gmd.de (8.8.8/8.8.8) id NAA00881; Mon, 5 Feb 2001 13:59:28 +0100 (MET) Date: Mon, 5 Feb 2001 13:59:28 +0100 (MET) From: Michael Smirnov Message-Id: <200102051259.NAA00881@dumbo.fokus.gmd.de> To: ssm-interest@external.cisco.com, maddogs@ietf.org, Dirk.Ooms@alcatel.be Subject: Re: multicast-transition X-Sun-Charset: US-ASCII Hi Dirk, On Mon Feb 5 12:28:54 2001 Dirk Ooms wrote: > I was wondering whether anyone ever considered to apply techniques, > similar to the ones defined in ngtrans for ipv6, to ip multicast. <...> are you suggesting another "multicast deployment bof" at ietf? Or, rather, you are in favour of application level multicast? cheers Michael From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Mon Feb 5 13:07:35 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id NAA13212 for ; Mon, 5 Feb 2001 13:07:34 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id IAA06921 for ; Mon, 5 Feb 2001 08:49:40 -0800 (PST) From: b4h443@arabia.com Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f15GnPS17222 for ; Mon, 5 Feb 2001 08:49:25 -0800 (PST) Received: from firsttech.co.za ([195.75.131.143]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f15Gn8226775 for ; Mon, 5 Feb 2001 08:49:09 -0800 (PST) Received: from ns.mobiletel.net ([63.46.223.184]) by firsttech.co.za with Microsoft SMTPSVC(5.0.2172.1); Mon, 5 Feb 2001 16:46:50 +0200 Message-ID: <0000712d5714$00000ac0$00003444@kate.ccohs.ca> To: Subject: Brand New E-Mail pager for FR-EE! 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No long term contract No activation fee No big prepayment of airtime No credit check PAGING AMERICA is going to give you absolutely Free the Brand new Motorola From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Mon Feb 5 14:53:39 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id OAA16022 for ; Mon, 5 Feb 2001 14:53:39 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id KAA27263 for ; Mon, 5 Feb 2001 10:39:23 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f15Id8114149 for ; Mon, 5 Feb 2001 10:39:08 -0800 (PST) Received: from snowstorm.mail.pipex.net (snowstorm.mail.pipex.net [158.43.192.97]) by proxy1.cisco.com (8.11.2/8.11.2) with SMTP id f15Id5R23784 for ; Mon, 5 Feb 2001 10:39:05 -0800 (PST) Received: (qmail 29070 invoked from network); 5 Feb 2001 18:31:04 -0000 Received: from userer75.uk.uudial.com (HELO vaionote) (62.188.16.116) by smtp-5.dial.pipex.com with SMTP; 5 Feb 2001 18:31:04 -0000 Message-ID: <00bf01c08f90$cbc4aa60$260dbc3e@vaionote> Reply-To: "Tony Ballardie" From: "Tony Ballardie" To: "Dirk Ooms" , , References: <3A7E7E28.F319258B@alcatel.be> Subject: Re: multicast-transition Date: Mon, 5 Feb 2001 16:29:09 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2919.6600 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 Content-Transfer-Encoding: 7bit Dirk, > Wouldn't it be good to investigate how > senders and/or receivers can hook up automatically to the MBone (without > the requirement of somebody in the MBone configuring a tunnel to your > network). I gave a short talk at mboned and ssm in San Diego about auto-tunnelling. It's a definite must, and real soon, if inter-domain IP multicast isn't going to completely wither. Although my proposal was only strawman-like, the concept at least was almost unanimously acknowledged as being needed. I proposed extending IGMP to additionally have receivers issue a special join to an anycast address which would create a tunnel between the receiver and closest multicast router. Whatever the mechanism, it has to be simple and not involve *any* 3rd party config, or ideally - user config. Of course, this implies host mods, but IGMP is evolving anyway, so it would be a good time (and chance) to integrate this. I think this capability is urgent for receivers, but less so for senders. "Broadcasters" should be - and probably are - prepared to go to greater lengths to ensure their content gets out there. I plan to write a draft but haven't had time yet, and I had a couple of offers to co-author, which might mean it gets done a bit quicker :-) cheers Tony From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Mon Feb 5 15:39:12 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id PAA16973 for ; Mon, 5 Feb 2001 15:39:11 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id LAA21137 for ; Mon, 5 Feb 2001 11:06:25 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f15J6D705444 for ; Mon, 5 Feb 2001 11:06:13 -0800 (PST) Received: from DF-INET-1.dogfoodinternet.com (df-inet1.exchange.microsoft.com [131.107.8.8]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f15J6AR09882 for ; Mon, 5 Feb 2001 11:06:10 -0800 (PST) Received: from df-virus1.platinum.corp.microsoft.com ([172.30.236.36]) by DF-INET-1.dogfoodinternet.com with Microsoft SMTPSVC(5.0.2195.1600); Mon, 5 Feb 2001 10:39:17 -0800 Received: from 172.30.236.11 by df-virus1.platinum.corp.microsoft.com (InterScan E-Mail VirusWall NT); Mon, 05 Feb 2001 10:40:01 -0800 (Pacific Standard Time) Received: from DF-BOWWOW.platinum.corp.microsoft.com ([172.30.236.100]) by yuri.dns.microsoft.com with Microsoft SMTPSVC(5.0.2195.2532); Mon, 5 Feb 2001 10:39:46 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.0.4638.0 content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Subject: RE: multicast-transition Date: Mon, 5 Feb 2001 10:39:44 -0800 Message-ID: <5B90AD65A9E8934987DB0C8C0762657405266B7E@DF-BOWWOW.platinum.corp.microsoft.com> Thread-Topic: multicast-transition Thread-Index: AcCPX7MlyI1w1iuWSJSCpq5s5KTzfQAQsWZg From: "Dave Thaler" To: "Dirk Ooms" , "Mohit Talwar" Cc: , X-OriginalArrivalTime: 05 Feb 2001 18:39:46.0441 (UTC) FILETIME=[03504F90:01C08FA3] Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by ietf.org id PAA16973 As Tony stated, he gave presentations at IETF on this topic that sparked a lot of discussion about how to do it. Mohit and I have talked about some mechansisms like this and are planning to write an I-D on this. If you're interested in spending cycles co-authoring with us (probably including Tony), send us email and we can follow up off-list. Two quick responses: 1) we propose using IGMP rather than PIM for the same reason we proposed it for ipv6 in draft-ietf-ngtrans-multicast-6to4-*.txt. 2) we prefer automatically creating network-layer tunnels not application-layer tunnels, just like how the various ngtrans technologies (tunnel brokers, 6to4, 6over4, etc) are implemented. -Dave > -----Original Message----- > From: Dirk Ooms [mailto:Dirk.Ooms@alcatel.be] > Sent: Monday, February 05, 2001 2:19 AM > To: ssm-interest@external.cisco.com; maddogs@ietf.org > Subject: multicast-transition > > > Hi all, > > I was wondering whether anyone ever considered to apply techniques, > similar to the ones defined in ngtrans for ipv6, to ip multicast. At > the moment one needs to configure static tunnels to connect > to the MBone > over a non-multicast network. Wouldn't it be good to investigate how > senders and/or receivers can hook up automatically to the > MBone (without > the requirement of somebody in the MBone configuring a tunnel to your > network). > > So, the concept of tunnel brokers might be useful: potential > senders or > receivers can request a tunnel to a tunnel broker. This requires some > boxes at the border of the MBone that are willing to > encapsulate/decapsulate, possibly take the role of DR (maybe one can > find broadcasters that want to sponsor such boxes). > > Automatic tunneling might be another mechanism helping the > deployment of > multicast. In SSM, one could consider mechanisms as the following one > (I know it impacts the current model, but I think it's also > pretty cool, > so maybe someone else might come up with variants that diminish the > impact): > > At the SSM meeting in Pittsburg Doron Rajwan presented the idea to > extend IGMP to enable SSM-senders to check whether there are any > receivers for their data. As an alternative one could consider to > terminate the PIM messages on the senders themselves (this would be a > scaled down PIM-stub with very limited functionality). Once this > principle of terminating PIM at the SSM-sender would be accepted, one > can easily create automatic tunnels: again a number of > special boxes are > placed at the border of the MBone, which will inject a default route > into the Mbone (the MRIBs will have a default route). So (S,G) PIM > Joins with an S that is not part of the multicast topology will follow > the default route and will end up in this special border box. The box > consults its RIB and tunnels the PIM Join to the sender S. By looking > at the source of the outer IP header the sender knows where it has to > tunnel its multicast data to. > > The above mechanism would allow that anyone can send to the MBone by > just downloading an application (no need to have a multicast router or > to configure a tunnel). In ISM it was required that a sender > sends its > data to the DR of the sender to be able to be discovered by the > receivers (via flooding or via an RP), but in SSM this is not > necessary > anymore since out-of-band signaling is used. > > In ngtrans there is another group of mechanisms beside > tunneling, which > are the translators. This could be another topic to investigate: how > can a unicast-only host hook up to a multicast distribution via a > special translator box. > > Any comment? > > dirk > > -- > Dirk Ooms mailto:dirk.ooms@alcatel.be > tel:+32 3 2404732 > Network Strategy Group (NSG) http://www.rc.bel.alcatel.be/nsg > Alcatel http://www.alcatel.com > From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Mon Feb 5 15:49:40 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id PAA17257 for ; Mon, 5 Feb 2001 15:49:39 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id KAA10139 for ; Mon, 5 Feb 2001 10:51:32 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f15IpHt23694 for ; Mon, 5 Feb 2001 10:51:17 -0800 (PST) Received: from mercury.Sun.COM (mercury.Sun.COM [192.9.25.1]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f15IpGx00139 for ; Mon, 5 Feb 2001 10:51:16 -0800 (PST) Received: from eastmail2.East.Sun.COM ([129.148.1.241]) by mercury.Sun.COM (8.9.3+Sun/8.9.3) with ESMTP id KAA27235; Mon, 5 Feb 2001 10:50:46 -0800 (PST) Received: from bcn.East.Sun.COM (bcn.East.Sun.COM [129.148.75.4]) by eastmail2.East.Sun.COM (8.9.3+Sun/8.9.3/ENSMAIL,v2.1p1) with ESMTP id NAA11291; Mon, 5 Feb 2001 13:50:44 -0500 (EST) Received: from elm (elm [129.148.75.61]) by bcn.East.Sun.COM (8.9.1b+Sun/8.9.1) with SMTP id NAA08322; Mon, 5 Feb 2001 13:50:44 -0500 (EST) Message-Id: <200102051850.NAA08322@bcn.East.Sun.COM> Date: Mon, 5 Feb 2001 13:50:43 -0500 (EST) From: Radia Perlman - Boston Center for Networking Reply-To: Radia Perlman - Boston Center for Networking Subject: Re: multicast-transition To: Dirk.Ooms@alcatel.be, ssm-interest@external.cisco.com, maddogs@ietf.org, ballardie@dial.pipex.com MIME-Version: 1.0 Content-Type: TEXT/plain; charset=us-ascii Content-MD5: gbLa11AmE6HuGh1ELFiGBA== X-Mailer: dtmail 1.3.0 @(#)CDE Version 1.3.4p_5 SunOS 5.7 sun4u sparc Actually, part of the Simple Multicast proposal involved automatic tunneling, with joins sent from the endnode or from a router that looked more or less like ordinary packets with destination=root. That way non-multicast routers just forward the message, and tunnels get automatically created between multicast routers or between the multicast endnodes and the routers. Some guys from Bandwiz attempted to get on the agenda to discuss this at a previous MADDOGs, but for some reason this was considered not important enough to make it onto the MADDOGs agenda, or perhaps the argument was that it was "too researchy", which doesn't make sense because my summer intern implemented it in 2 weeks, and there was a concrete proposal for it. Perhaps people didn't understand what the bandwiz people actually wanted to discuss. But the proposal is a better solution than IGMPv3 because it does not require a local multicast router, and because it can be deployed totally as a user process on the joining endnode, so it doesn't require getting a new version of the OS. So the advantages are: a) easy deployment...don't need new version of OS...deploying something at user level is always easier than waiting for new versions of the OS... e.g., SSL deployment vs IPSec...SSL happened "overnight" basically b) automatic tunneling so anyone, anywhere can join a multicast group (assuming an 8-byte multicast group, where the root is known to the joining node) c) the root of the tree gets at least one join if there are any listeners. So if there are no listeners, the root, if it's a sender, knows not to send. Radia From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Mon Feb 5 17:23:23 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id RAA19236 for ; Mon, 5 Feb 2001 17:23:22 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id NAA05215 for ; Mon, 5 Feb 2001 13:11:36 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f15LBWv07088 for ; Mon, 5 Feb 2001 13:11:32 -0800 (PST) Received: from multicasttech.com (IDENT:root@garcia.multicasttech.com [63.105.122.8]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f15LBVx08641 for ; Mon, 5 Feb 2001 13:11:32 -0800 (PST) Received: from [63.105.122.193] (HELO 21rst-century.com) by multicasttech.com (CommuniGate Pro SMTP 3.3.2) with ESMTP id 740777; Mon, 05 Feb 2001 15:46:06 -0500 Message-ID: <3A7F106E.5958A846@21rst-century.com> Date: Mon, 05 Feb 2001 15:43:26 -0500 From: Marshall Eubanks Reply-To: tme@21rst-century.com X-Mailer: Mozilla 4.7C-CCK-MCD {C-UDP; EBM-APPLE} (Macintosh; I; PPC) X-Accept-Language: en,pdf MIME-Version: 1.0 To: Dave Thaler CC: Dirk Ooms , Mohit Talwar , ssm-interest@external.cisco.com, maddogs@ietf.org, Tony Ballardie Subject: Re: multicast-transition References: <5B90AD65A9E8934987DB0C8C0762657405266B7E@DF-BOWWOW.platinum.corp.microsoft.com> Content-Type: text/plain; charset=us-ascii; x-mac-type="54455854"; x-mac-creator="4D4F5353" Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Dave Thaler wrote: > As Tony stated, he gave presentations at IETF on this topic that > sparked a lot of discussion about how to do it. Mohit and I > have talked about some mechansisms like this and are planning to > write an I-D on this. If you're interested in spending cycles > co-authoring with us (probably including Tony), send us email and > we can follow up off-list. Dave; As I was talking about this with Tony I will volunteer here. > > > Two quick responses: > 1) we propose using IGMP rather than PIM for the same reason > we proposed it for ipv6 in draft-ietf-ngtrans-multicast-6to4-*.txt. Is this the same as draft-thaler-ngtrans-6to4-multicast-01.txt ? ( http://www.ietf.org/internet-drafts/draft-thaler-ngtrans-6to4-multicast-01.txt ) I can't find it under the other name. > > 2) we prefer automatically creating network-layer tunnels > not application-layer tunnels, just like how the various ngtrans > technologies (tunnel brokers, 6to4, 6over4, etc) are implemented. > > -Dave It seems to me that if you go to the trouble of having IGMP or PIM set up, then you are likely to be multicast savvy, and so won't really need this. Otherwise, IGMP may be set up (or not) by your provider - if they don't do multicasting, they are unlikely to do IGMP. In fact, I know of at least one ISP that has PIM enabled backbones but does not IGMP enable edge routers just to keep multicasting under tight control. This all seems a lot different from the case of IPv6, where the provider may be assumed to be cooperative. Having application level auto-tunneling would really expand the usability of multicasting, I suspect a lot more than for network-layer tunnels. -- Regards Marshall Eubanks > > > > -----Original Message----- > > From: Dirk Ooms [mailto:Dirk.Ooms@alcatel.be] > > Sent: Monday, February 05, 2001 2:19 AM > > To: ssm-interest@external.cisco.com; maddogs@ietf.org > > Subject: multicast-transition > > > > > > Hi all, > > > > I was wondering whether anyone ever considered to apply techniques, > > similar to the ones defined in ngtrans for ipv6, to ip multicast. At > > the moment one needs to configure static tunnels to connect > > to the MBone > > over a non-multicast network. Wouldn't it be good to investigate how > > senders and/or receivers can hook up automatically to the > > MBone (without > > the requirement of somebody in the MBone configuring a tunnel to your > > network). > > > > So, the concept of tunnel brokers might be useful: potential > > senders or > > receivers can request a tunnel to a tunnel broker. This requires some > > boxes at the border of the MBone that are willing to > > encapsulate/decapsulate, possibly take the role of DR (maybe one can > > find broadcasters that want to sponsor such boxes). > > > > Automatic tunneling might be another mechanism helping the > > deployment of > > multicast. In SSM, one could consider mechanisms as the following one > > (I know it impacts the current model, but I think it's also > > pretty cool, > > so maybe someone else might come up with variants that diminish the > > impact): > > > > At the SSM meeting in Pittsburg Doron Rajwan presented the idea to > > extend IGMP to enable SSM-senders to check whether there are any > > receivers for their data. As an alternative one could consider to > > terminate the PIM messages on the senders themselves (this would be a > > scaled down PIM-stub with very limited functionality). Once this > > principle of terminating PIM at the SSM-sender would be accepted, one > > can easily create automatic tunnels: again a number of > > special boxes are > > placed at the border of the MBone, which will inject a default route > > into the Mbone (the MRIBs will have a default route). So (S,G) PIM > > Joins with an S that is not part of the multicast topology will follow > > the default route and will end up in this special border box. The box > > consults its RIB and tunnels the PIM Join to the sender S. By looking > > at the source of the outer IP header the sender knows where it has to > > tunnel its multicast data to. > > > > The above mechanism would allow that anyone can send to the MBone by > > just downloading an application (no need to have a multicast router or > > to configure a tunnel). In ISM it was required that a sender > > sends its > > data to the DR of the sender to be able to be discovered by the > > receivers (via flooding or via an RP), but in SSM this is not > > necessary > > anymore since out-of-band signaling is used. > > > > In ngtrans there is another group of mechanisms beside > > tunneling, which > > are the translators. This could be another topic to investigate: how > > can a unicast-only host hook up to a multicast distribution via a > > special translator box. > > > > Any comment? > > > > dirk > > > > -- > > Dirk Ooms mailto:dirk.ooms@alcatel.be > > tel:+32 3 2404732 > > Network Strategy Group (NSG) http://www.rc.bel.alcatel.be/nsg > > Alcatel http://www.alcatel.com > > T.M. Eubanks Multicast Technologies, Inc 10301 Democracy Lane, Suite 410 Fairfax, Virginia 22030 Phone : 703-293-9624 Fax : 703-293-9609 e-mail : tme@on-the-i.com tme@multicasttech.com http://www.on-the-i.com http://www.buzzwaves.com From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Mon Feb 5 17:48:42 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id RAA19799 for ; Mon, 5 Feb 2001 17:48:41 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id NAA03953 for ; Mon, 5 Feb 2001 13:46:46 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f15LkgP03871 for ; Mon, 5 Feb 2001 13:46:42 -0800 (PST) Received: from snowstorm.mail.pipex.net (snowstorm.mail.pipex.net [158.43.192.97]) by proxy1.cisco.com (8.11.2/8.11.2) with SMTP id f15LkbR12882 for ; Mon, 5 Feb 2001 13:46:38 -0800 (PST) Received: (qmail 1446 invoked from network); 5 Feb 2001 21:38:35 -0000 Received: from usereo94.uk.uudial.com (HELO vaionote) (62.188.15.92) by smtp-5.dial.pipex.com with SMTP; 5 Feb 2001 21:38:35 -0000 Message-ID: <012901c08faa$fcad4500$260dbc3e@vaionote> Reply-To: "Tony Ballardie" From: "Tony Ballardie" To: , "Dave Thaler" Cc: "Dirk Ooms" , "Mohit Talwar" , , References: <5B90AD65A9E8934987DB0C8C0762657405266B7E@DF-BOWWOW.platinum.corp.microsoft.com> <3A7F106E.5958A846@21rst-century.com> Subject: Re: multicast-transition Date: Mon, 5 Feb 2001 19:36:40 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2919.6600 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 Content-Transfer-Encoding: 7bit Marshall, > It seems to me that if you go to the trouble of having IGMP or PIM set up, then you > are likely to be multicast savvy, and so won't really need this. Otherwise, IGMP may > be set up (or not) by your provider - if they don't do multicasting, they are unlikely to > do IGMP. In fact, I know of at least one ISP that has PIM enabled backbones > but does not IGMP enable edge routers just to keep multicasting under tight control. > This all seems a lot different from the case of IPv6, where the provider may be > assumed to be cooperative. Having application level auto-tunneling would really > expand the usability of multicasting, I suspect a lot more than for network-layer tunnels. the idea, as I envisage it, is to have a special IGMP message anycast to a well-known (hard coded) anycast address, though probably changeable through a config option. Most OSs support IGMP, so the user would/can be oblivious, and similarly for intervening ISP(s). The other component to auto-tunnelling I forgot to mention is where a *router* has to get over non mcast infrastructure. My first suggestion for this was to alter the destn of PIM joins to the anycast addr, but I gather it affects other PIM behaviours. However, whether the trade-off of doing it anyway and altering PIM accordingly, is worth it?? My view is, that after all these years of not getting very far, we *need* transparent auto-tunnelling for the host AND router, else IP mcast will never fulfil its potential. As I see it that's not the end of the story either... then there's QoS, reliability (ok, dealt with by RMT, but still early days), and inter-provider pricing to solve before it can become commercially viable in itself. And I'm a fan of IP mcast, but these seem to be the harsh realities :-( The CDNs have overtaken IPM because their solutions plug the holes, although they tend to be less efficient in the network. Tony From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Mon Feb 5 19:07:11 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id TAA20938 for ; Mon, 5 Feb 2001 19:07:11 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id OAA00538 for ; Mon, 5 Feb 2001 14:57:06 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f15Mv3824883 for ; Mon, 5 Feb 2001 14:57:03 -0800 (PST) Received: from multicasttech.com (IDENT:root@garcia.multicasttech.com [63.105.122.8]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f15Mv1R23445 for ; Mon, 5 Feb 2001 14:57:01 -0800 (PST) Received: from [63.105.122.193] (HELO 21rst-century.com) by multicasttech.com (CommuniGate Pro SMTP 3.3.2) with ESMTP id 740824; Mon, 05 Feb 2001 17:18:30 -0500 Message-ID: <3A7F2614.AAD890E7@21rst-century.com> Date: Mon, 05 Feb 2001 17:15:48 -0500 From: Marshall Eubanks Reply-To: tme@21rst-century.com X-Mailer: Mozilla 4.7C-CCK-MCD {C-UDP; EBM-APPLE} (Macintosh; I; PPC) X-Accept-Language: en,pdf MIME-Version: 1.0 To: Tony Ballardie CC: Dave Thaler , Dirk Ooms , Mohit Talwar , ssm-interest@external.cisco.com, maddogs@ietf.org Subject: Re: multicast-transition References: <5B90AD65A9E8934987DB0C8C0762657405266B7E@DF-BOWWOW.platinum.corp.microsoft.com> <3A7F106E.5958A846@21rst-century.com> <012901c08faa$fcad4500$260dbc3e@vaionote> Content-Type: text/plain; charset=us-ascii; x-mac-type="54455854"; x-mac-creator="4D4F5353" Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Tony Ballardie wrote: > Marshall, > > > It seems to me that if you go to the trouble of having IGMP or PIM set up, > then you > > are likely to be multicast savvy, and so won't really need this. > Otherwise, IGMP may > > be set up (or not) by your provider - if they don't do multicasting, they > are unlikely to > > do IGMP. In fact, I know of at least one ISP that has PIM enabled > backbones > > but does not IGMP enable edge routers just to keep multicasting under > tight control. > > This all seems a lot different from the case of IPv6, where the provider > may be > > assumed to be cooperative. Having application level auto-tunneling would > really > > expand the usability of multicasting, I suspect a lot more than for > network-layer tunnels. > > the idea, as I envisage it, is to have a special IGMP message > anycast to a well-known (hard coded) anycast address, though > probably changeable through a config option. Most OSs support > IGMP, so the user would/can be oblivious, and similarly for > intervening ISP(s). > > The other component to auto-tunnelling I forgot to mention is > where a *router* has to get over non mcast infrastructure. > My first suggestion for this was to alter the destn of PIM joins > to the anycast addr, but I gather it affects other PIM behaviours. > However, whether the trade-off of doing it anyway and altering > PIM accordingly, is worth it?? My view is, that after all these years > of not getting very far, we *need* transparent auto-tunnelling > for the host AND router, else IP mcast will never fulfil its potential. > > As I see it that's not the end of the story either... then there's > QoS, reliability (ok, dealt with by RMT, but still early days), and > inter-provider pricing to solve before it can become commercially > viable in itself. And I'm a fan of IP mcast, but these seem to be the > harsh realities :-( The CDNs have overtaken IPM because their > solutions plug the holes, although they tend to be less efficient > in the network. > > Tony Yes, except for one little thing - they are way too expensive to make a profit from advertising. ALL unicast solutions for which I have pricing are too expensive to make a profit from advertising. There is a LOT of interest about multicasting in the (rather desperate) Internet broadcast community. If we can get it together, the market will be there. -- Marshall T.M. Eubanks Multicast Technologies, Inc 10301 Democracy Lane, Suite 410 Fairfax, Virginia 22030 Phone : 703-293-9624 Fax : 703-293-9609 e-mail : tme@on-the-i.com tme@multicasttech.com http://www.on-the-i.com http://www.buzzwaves.com From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Tue Feb 6 01:28:01 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id BAA28997 for ; Tue, 6 Feb 2001 01:28:00 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id VAA23781 for ; Mon, 5 Feb 2001 21:20:51 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f165KsS16193 for ; Mon, 5 Feb 2001 21:20:54 -0800 (PST) Received: from ns.live.com (ns.live.com [208.184.148.162]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f165KkR23968 for ; Mon, 5 Feb 2001 21:20:46 -0800 (PST) Received: (from rsf@localhost) by ns.live.com (8.9.3/8.9.3) id VAA93674; Mon, 5 Feb 2001 21:16:13 -0800 (PST) (envelope-from rsf) Message-Id: <4.3.1.1.20010205203521.00b8d620@localhost> X-Sender: rsf@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Mon, 05 Feb 2001 21:16:11 -0800 To: ssm-interest@external.cisco.com, maddogs@ietf.org From: Ross Finlayson Subject: Re: multicast-transition In-Reply-To: <3A7F2614.AAD890E7@21rst-century.com> References: <5B90AD65A9E8934987DB0C8C0762657405266B7E@DF-BOWWOW.platinum.corp.microsoft.com> <3A7F106E.5958A846@21rst-century.com> <012901c08faa$fcad4500$260dbc3e@vaionote> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed In considering a multicast tunneling solution, we need to be clear about exactly what environment(s) we are aiming for. As Tony noted, the immediate focus should be on mechanisms for supporting non-native-multicast *receivers*. (It might also be useful to concentrate first on *SSM* receivers, although I hope ISM can be supported as well.) Considering receivers, there seem to be four possibilities, based on two independent Boolean variables: - "OldOS" or "NewOS": Whether or not the receiver's OS supports (or can be upgraded to support) IGMPv3, and/or a IP-level multicast tunneling protocol. - "OldFHR" or "NewFHR": Whether or not the receiver's first-hop router supports (or can be upgraded to support) IGMPv3 and PIM, or failing that, a multicast tunneling protocol. So, the four cases to consider are: 1/ OldOS,OldFHR 2/ OldOS,NewFHR 3/ NewOS,OldFHR 4/ NewOS,NewFHR (Case 4 [NewOS,NewFHR] is the ideal case in which both the OS and FHR are doing 'the right thing', so no tunneling is needed.) Of the remaining 3 cases, the most frequently occurring (and thus the most important cases to consider) are probably [OldOS,OldFHR], [NewOS,OldFHR], and [OldOS,NewFHR], in that order. (Note that for most end users, their first-hop router is a legacy DSL router or dialup portmaster.) In any event, it seems clear that any useful tunneling solution can't ignore the [OldOS,OldFHR] case. For the two "OldOS" cases, we already have a well-defined (and implemented and deployed) tunneling protocol: UMTP . There's no reason why smart upstream routers couldn't be made smart enough to intercept UMTP "join"/"leave" requests, and act as a tunneling endpoint. For the [NewOS,OldFHR] case, we can (& probably should) do something smarter - perhaps some sort of IGMPv3-over-IP tunneling, tied in with the OS's IGMPv3 implementation somehow... From what I can tell, this is the case that Tony has been looking at. Orthogonal to this is the question of how to *find* tunnel endpoints. The simplest solution would be to have this happen automatically, under the assumption that tunnel endpoints will be implemented in (or at least, are colocated with) multicast routers. (Again, we might want to focus solely on SSM as a simplifying assumption here.) Ross. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Tue Feb 6 10:30:50 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id KAA18118 for ; Tue, 6 Feb 2001 10:30:49 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id GAA25656 for ; Tue, 6 Feb 2001 06:29:21 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f16ETDx16740 for ; Tue, 6 Feb 2001 06:29:13 -0800 (PST) Received: from multicasttech.com (IDENT:root@garcia.multicasttech.com [63.105.122.8]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f16ET4U14205 for ; Tue, 6 Feb 2001 06:29:04 -0800 (PST) Received: from [216.8.12.240] (HELO 21rst-century.com) by multicasttech.com (CommuniGate Pro SMTP 3.3.2) with ESMTP id 740997; Tue, 06 Feb 2001 09:26:38 -0500 Message-ID: <3A8009D6.3C71880E@21rst-century.com> Date: Tue, 06 Feb 2001 09:27:34 -0500 From: Marshall Eubanks Reply-To: tme@21rst-century.com Organization: Multicast Technologies X-Mailer: Mozilla 4.7C-CCK-MCD {C-UDP; EBM-APPLE} (Macintosh; I; PPC) X-Accept-Language: en MIME-Version: 1.0 To: Ross Finlayson , Bill Fenner , Dave Meyer CC: ssm-interest@external.cisco.com, maddogs@ietf.org Subject: Re: multicast-transition References: <5B90AD65A9E8934987DB0C8C0762657405266B7E@DF-BOWWOW.platinum.corp.microsoft.com> <3A7F106E.5958A846@21rst-century.com> <012901c08faa$fcad4500$260dbc3e@vaionote> <4.3.1.1.20010205203521.00b8d620@localhost> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Hi Ross; SSMinterest is not really the appropriate place to discuss this IMHO, as it is not really an SSM issue. MboneD or even IDMR might be better. Ross Finlayson wrote: > > In considering a multicast tunneling solution, we need to be clear about > exactly what environment(s) we are aiming for. As Tony noted, the > immediate focus should be on mechanisms for supporting non-native-multicast > *receivers*. (It might also be useful to concentrate first on *SSM* > receivers, although I hope ISM can be supported as well.) Why ? What's the difference here ? In both ISM and SSM you have a receiver receiving multicast traffic (maybe by unicast) and mirroring this traffic out to other receivers. Why should this system care what address block the traffic uses ? Or are you just saying that the first goal should be to support receivers, not senders ? That's OK, of course. Whether it's a IGMP v2 or v3 join, the real problem is source discovery, which is going to involve some out of band mechanism, so I do not see that SSM really buys you much in this case... > > Considering receivers, there seem to be four possibilities, based on two > independent Boolean variables: > - "OldOS" or "NewOS": Whether or not the receiver's OS supports (or can be > upgraded to support) IGMPv3, and/or a IP-level multicast tunneling protocol. > - "OldFHR" or "NewFHR": Whether or not the receiver's first-hop router > supports (or can be upgraded to support) IGMPv3 and PIM, or failing that, a > multicast tunneling protocol. > > So, the four cases to consider are: > 1/ OldOS,OldFHR > 2/ OldOS,NewFHR > 3/ NewOS,OldFHR > 4/ NewOS,NewFHR > > (Case 4 [NewOS,NewFHR] is the ideal case in which both the OS and FHR are > doing 'the right thing', so no tunneling is needed.) > > Of the remaining 3 cases, the most frequently occurring (and thus the most > important cases to consider) are probably [OldOS,OldFHR], [NewOS,OldFHR], > and [OldOS,NewFHR], in that order. (Note that for most end users, their > first-hop router is a legacy DSL router or dialup portmaster.) In any > event, it seems clear that any useful tunneling solution can't ignore the > [OldOS,OldFHR] case. > > For the two "OldOS" cases, we already have a well-defined (and implemented > and deployed) tunneling protocol: UMTP > . There's > no reason why smart upstream routers couldn't be made smart enough to > intercept UMTP "join"/"leave" requests, and act as a tunneling endpoint. > > For the [NewOS,OldFHR] case, we can (& probably should) do something > smarter - perhaps some sort of IGMPv3-over-IP tunneling, tied in with the > OS's IGMPv3 implementation somehow... From what I can tell, this is the > case that Tony has been looking at. > > Orthogonal to this is the question of how to *find* tunnel endpoints. The > simplest solution would be to have this happen automatically, under the > assumption that tunnel endpoints will be implemented in (or at least, are > colocated with) multicast routers. (Again, we might want to focus solely > on SSM as a simplifying assumption here.) > > Ross. The trouble I have with any sort of router based version of this is that the people who cannot get multicast largely cannot get it because their routers are not configured for it, and these routers are beyond their control. So a router based version really solves nothing, it just replaces one problem with another. At the ISP level, I think that the solution should be, _enable multicasting_, not, enable a work-around. I would argue that this problem has been solved already, and more than once, just not in the real time case, and at the application level. Think about Gnutella, or even Napster. What are these really but source discovery protocols ? And this problem is at heart a source discovery problem. Now, these are not appropriate / efficient solutions for this problem at hand, but they do show that a protocol for application layer multicasting as a standalone piece of software could find wide utility. Also, I regard the MDU/MTU market as the prime target of multicasting at present. Most of these people are on Ethernets. A very useful protocol, and a good first step, would be one to allow a receiver on a MDU/MTU LAN to mirror a received tunnel to others on the same LAN using layer 2 Ethernet multicast. Regards Marshall Eubanks Multicast Technologies, Inc. 10301 Democracy Lane, Suite 201 Fairfax, Virginia 22030 Phone : 703-293-9624 Fax : 703-293-9609 e-mail : tme@on-the-i.com http://www.on-the-i.com From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Tue Feb 6 10:45:23 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id KAA18775 for ; Tue, 6 Feb 2001 10:45:22 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id GAA26403 for ; Tue, 6 Feb 2001 06:41:50 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f16EflO05900 for ; Tue, 6 Feb 2001 06:41:47 -0800 (PST) Received: from isis.lip6.fr (IDENT:root@isis.lip6.fr [132.227.60.2]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f16Efk617884 for ; Tue, 6 Feb 2001 06:41:47 -0800 (PST) Received: from rp.lip6.fr (tibre.lip6.fr [132.227.74.2]) by isis.lip6.fr (8.11.0/jtpda-5.3.2) with ESMTP id f16EeiV32075 ; Tue, 6 Feb 2001 15:40:44 +0100 Received: from tyro.lip6.fr (tyro.lip6.fr [132.227.61.64]) by rp.lip6.fr (8.8.8/jtpda-5.2) with ESMTP id PAA28511 ; Tue, 6 Feb 2001 15:40:42 +0100 (MET) Received: from localhost (costa@localhost) by tyro.lip6.fr (8.9.3/8.8.6) with ESMTP id PAA01307; Tue, 6 Feb 2001 15:40:43 +0100 X-Authentication-Warning: tyro.lip6.fr: costa owned process doing -bs Date: Tue, 6 Feb 2001 15:40:43 +0100 (MET) From: Luis Costa To: Jon Crowcroft cc: Dirk Ooms , "ssm-interest@external.cisco.com" , "maddogs@ietf.org" Subject: Re: multicast-transition In-Reply-To: <1459.981378099@cs.ucl.ac.uk> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII On Mon, 5 Feb 2001, Jon Crowcroft wrote: > > In message <3A7E7E28.F319258B@alcatel.be>, Dirk Ooms typed: > > >>In ngtrans there is another group of mechanisms beside tunneling, which > >>are the translators. This could be another topic to investigate: how > >>can a unicast-only host hook up to a multicast distribution via a > >>special translator box. > > >>Any comment? > > dirk > > 1/ you may need to consider load balancing the tunnel brokers - this can > be complex > > 2/ you will need to consider policy at the tunnel brokers > (the same reason an ISP might not want multicast is why they wont be > too fond of peope running tunnel brokers in the next door isp... > > 3/ see REUNITE (recursive unicast multicast ) from CMU as an approach > to some of this... We are currently working on an evolution of REUNITE's idea, named HBH, that extends the ability to support unicast clouds, especially for asymmetric networks. We presented a poster at NGC'2000, you can also take a look at the technical report at http://www-rp.lip6.fr/publications/files/costa/hbh.ps.gz Comments are welcome! Luis ======================================================================= Luis Henrique MACIEL KOSMALSKI COSTA Luis.Costa@lip6.fr D.Sc. Student Laboratoire d'Informatique de Paris VI LIP6-UPMC - France Grupo de Teleinformatica e Automacao GTA-COPPE/UFRJ - Brasil WWW - http://www-rp.lip6.fr/~costa Tel. +33 1 44 27 87 72 Research Interests: QoS-based Routing and Multimedia Applications. ======================================================================= From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Tue Feb 6 13:32:16 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id NAA27323 for ; Tue, 6 Feb 2001 13:32:04 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id JAA18975 for ; Tue, 6 Feb 2001 09:29:44 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f16HTUc03953 for ; Tue, 6 Feb 2001 09:29:30 -0800 (PST) Received: from patan.sun.com (patan.Sun.COM [192.18.98.43]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f16HTQU27455 for ; Tue, 6 Feb 2001 09:29:27 -0800 (PST) Received: from eastmail2.East.Sun.COM ([129.148.1.241]) by patan.sun.com (8.9.3+Sun/8.9.3) with ESMTP id JAA17546; Tue, 6 Feb 2001 09:29:06 -0800 (PST) Received: from bcn.East.Sun.COM (bcn.East.Sun.COM [129.148.75.4]) by eastmail2.East.Sun.COM (8.9.3+Sun/8.9.3/ENSMAIL,v2.1p1) with ESMTP id MAA06841; Tue, 6 Feb 2001 12:29:04 -0500 (EST) Received: from elm (elm [129.148.75.61]) by bcn.East.Sun.COM (8.9.1b+Sun/8.9.1) with SMTP id MAA13061; Tue, 6 Feb 2001 12:29:04 -0500 (EST) Message-Id: <200102061729.MAA13061@bcn.East.Sun.COM> Date: Tue, 6 Feb 2001 12:29:03 -0500 (EST) From: Radia Perlman - Boston Center for Networking Reply-To: Radia Perlman - Boston Center for Networking Subject: Re: multicast-transition To: ssm-interest@external.cisco.com, maddogs@ietf.org, finlayson@live.com MIME-Version: 1.0 Content-Type: TEXT/plain; charset=us-ascii Content-MD5: SMtLbCc6gCBR8+JBPsrC2Q== X-Mailer: dtmail 1.3.0 @(#)CDE Version 1.3.4p_5 SunOS 5.7 sun4u sparc Re: Ross Finlayson said: Orthogonal to this is the question of how to *find* tunnel endpoints. The simplest solution would be to have this happen automatically, under the assumption that tunnel endpoints will be implemented in (or at least, are colocated with) multicast routers. (Again, we might want to focus solely on SSM as a simplifying assumption here.) ********** Here's a straightforward mechanism that does what you want, and the tunnel endpoint can either be a router or the Root of the tree, allowing someone to host a multicast group before the infrastructure around him is multicast enabled, and not change the mechanism as gradually the routers around him become multicast enabled. Likewise, you can join a group without being in a multicast enabled part of the world and use the same mechanism as you would when your world becomes multicast enabled. As I said, there was an internet draft from some people from a company called Bandwiz, but I don't remember their names, and it was also part of the Simple Multicast draft. But it's easier to understand if just the mechanism is summarized, rather than being part of another draft. Besides, I did a quick search for the Bandwiz internet draft and couldn't find it. So here is a summary. Think of a multicast group as an 8-byte quantity...Root address and group qualifier assigned by the Root. In the case of SSM, the resulting tree is unidirectional, but the important thing is that the Root address is known and the group qualifier need not be universally coordinated or unique...just unique to that Root which is hosting the group. An application layer process at the joining host sends the equivalent of a PIM join message saying "join (R,G)". That message has an IP header with destination=R (the tree root), and an IP option that might be slow-pathed by non-multicast routers, but will be forwarded (performance is not critical on a join message...once the tree is set up, data can be fast pathed). There are other encodings, like a new "protocol" (IPv4) or "next header" (IPv6 terminology)...just so long as an "old" router will forward it towards the Root, and a "new router" can know to trap the message and process it. The first multicast aware router along the path notices the message and creates a tunnel to the source address in the IP header. In the worst case, where only the Root and the joining endnodes are multicast enabled for this form of multicast, the tunnel is automatically formed between the receiver and the Root. The more routers that get upgraded, the fewer tunnels there are, so eventually it's really multicast rather than n unicast messages sent by the Root. And it's trivial to cause an endnode to be multicast enabled, since it's a user-level process that can send the join. The join can look the same as a router join. And this approach has the advantage, as the Bandwiz person pointed out, that the sender won't bother sending if nobody has joined the group. And this approach forms the minimal number of tunnels. This approach could also hop over routers that have run out of room to keep state. And I believe people have also proposed ways of reducing fanout at a node with too many tunnels by having a multiple tunnel endpoint tell some of the other nodes to tunnel to each other first to consolidate tunnels. Don't remember where that was written up. Perhaps only in an email message on some list. Radia From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Tue Feb 6 16:30:20 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id QAA02530 for ; Tue, 6 Feb 2001 16:30:19 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id MAA04393 for ; Tue, 6 Feb 2001 12:20:48 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f16KJnf27397 for ; Tue, 6 Feb 2001 12:19:49 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f16KJTb17161 for ; Tue, 6 Feb 2001 12:19:29 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id MAA17297; Tue, 6 Feb 2001 12:15:16 -0800 Date: Tue, 6 Feb 2001 12:15:16 -0800 Message-Id: <200102062015.MAA17297@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: radia@bcn.East.Sun.COM CC: ssm-interest@external.cisco.com, maddogs@ietf.org, finlayson@live.com In-reply-to: <200102061729.MAA13061@bcn.East.Sun.COM> (message from Radia Perlman - Boston Center for Networking on Tue, 6 Feb 2001 12:29:03 -0500 (EST)) Subject: Re: multicast-transition References: <200102061729.MAA13061@bcn.East.Sun.COM> >> The first multicast aware router along the path notices the message >> and creates a tunnel to the source address in the IP header. In most cases, a router doesn't know it is the first multicast router. With topology changes, you need the Join to be sent periodically so it can time out the tunnel state in the multicast router. Also this is not trivial to do in existing hardware from the multicast router's point of view. When a router is in it's replication loop, there are no changes to the IP header, just changes to the layer-2 header. This solution requires the destination IP address to be rewritten and an entire IP header checksum recalculation (partial checksum will be hard in this case). You effectively put NAT in the fast-path. So simple as it may seem, it really isn't. Dino From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Tue Feb 6 17:06:25 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id RAA03369 for ; Tue, 6 Feb 2001 17:06:23 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id NAA29708 for ; Tue, 6 Feb 2001 13:00:55 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f16L0et15437 for ; Tue, 6 Feb 2001 13:00:40 -0800 (PST) Received: from patan.sun.com (patan.Sun.COM [192.18.98.43]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f16L0Q604562 for ; Tue, 6 Feb 2001 13:00:26 -0800 (PST) Received: from eastmail1.East.Sun.COM ([129.148.1.240]) by patan.sun.com (8.9.3+Sun/8.9.3) with ESMTP id NAA10493; Tue, 6 Feb 2001 13:00:02 -0800 (PST) Received: from bcn.East.Sun.COM (bcn.East.Sun.COM [129.148.75.4]) by eastmail1.East.Sun.COM (8.9.3+Sun/8.9.3/ENSMAIL,v2.1p1) with ESMTP id QAA10750; Tue, 6 Feb 2001 16:00:01 -0500 (EST) Received: from elm (elm [129.148.75.61]) by bcn.East.Sun.COM (8.9.1b+Sun/8.9.1) with SMTP id QAA14585; Tue, 6 Feb 2001 16:00:00 -0500 (EST) Message-Id: <200102062100.QAA14585@bcn.East.Sun.COM> Date: Tue, 6 Feb 2001 16:00:00 -0500 (EST) From: Radia Perlman - Boston Center for Networking Reply-To: Radia Perlman - Boston Center for Networking Subject: Re: multicast-transition To: dino@procket.com Cc: ssm-interest@external.cisco.com, maddogs@ietf.org, finlayson@live.com MIME-Version: 1.0 Content-Type: TEXT/plain; charset=us-ascii Content-MD5: MXIMQK45tKi17vKC513gbw== X-Mailer: dtmail 1.3.0 @(#)CDE Version 1.3.4p_5 SunOS 5.7 sun4u sparc Re Dino's note: Not sure I understand your note, or maybe you misunderstood mine. >> The first multicast aware router along the path notices the message >> and creates a tunnel to the source address in the IP header. In most cases, a router doesn't know it is the first multicast router. With topology changes, you need the Join to be sent periodically so it can time out the tunnel state in the multicast router. The router doesn't have to decide whether it's the first multicast router. if it sees the join, then it's the first one that saw it. The only issue is on LANs, and maybe that's what you're talking about...the routers on a LAN have to decide which of them will forward packets off that LAN towards the set of IP addresses that include the root node. So for instance if the first endnode sends to the "wrong" router, that router has to forward it to the "right" router. But PIM does all this sort of stuff anyway. None of those mechanisms need to change. As for the paths changing...yes, you need periodic joins (keepalives), and old unused paths should atrophy. Again, doesn't PIM do all that anyway? I don't think there's anything different. Also this is not trivial to do in existing hardware from the multicast router's point of view. When a router is in it's replication loop, there are no changes to the IP header, just changes to the layer-2 header. This solution requires the destination IP address to be rewritten and an entire IP header checksum recalculation (partial checksum will be hard in this case). You effectively put NAT in the fast-path. Again, not sure what you're saying here. A tunnel is IP in IP. There's an outer IP header that specifies as the destination the tunnel endpoint. Routers on the "inside" of the tunnel just forward it like an ordinary IP packet. Routers on the end have to take off the IP header just as if the IP header is a layer 2 header. Any tunneling solution will have this problem. And once all the routers get upgraded to be multicast routers, multicast just gets forwarded like ordinary layer 3 multicast. THe IP header checksum doesn't need to be recalculated. The outer header just gets stripped off. If you have to forward across a tunnel rather than to a neighbor, then you have to add an IP header, including an IP checksum. But again, that's what tunnels do. One of the early encodings suggest for Simple Multicast spec tried to create a tunnel without an extra IP header by rewriting the dest address to be the tunnel endpoint, but after comments from router implementers, that cleverness turned out to be too much trouble (not sure I remember all the reasons why, perhaps it involved what you're talking about with recalculating the IP checksum), and merely putting on a complete extra IP header specifying the destination to be the tunnel endpoint was simpler. So maybe that's what you were referring to. Radia From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Tue Feb 6 20:56:13 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id UAA06173 for ; Tue, 6 Feb 2001 20:56:13 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id RAA07845 for ; Tue, 6 Feb 2001 17:06:12 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f17164n13540 for ; Tue, 6 Feb 2001 17:06:04 -0800 (PST) Received: from davis.bandwiz.com ([212.150.220.34]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1715db24765 for ; Tue, 6 Feb 2001 17:05:40 -0800 (PST) Received: by davis.bandwiz.com with Internet Mail Service (5.5.2650.21) id <1LSFDYMX>; Wed, 7 Feb 2001 03:02:13 +0200 Message-ID: <288F58308EFBD411B896006008F5DCAA3C14@davis.bandwiz.com> From: Meir Feder To: ssm-interest@external.cisco.com Cc: Radia Perlman - Boston Center for Networking , maddogs@ietf.org, finlayson@live.com, Doron Rajwan Subject: RE: multicast-transition (fwd) Date: Wed, 7 Feb 2001 03:02:12 +0200 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset="iso-8859-1" As the presentation of Doron Rajwan (Bandwiz CTO) in Pittsburgh on automatic tunneling came up in the recent discussion, here is what was submitted on the subject. As always, any comment is welcomed. We do hope that the automatic tunneling will be pushed forward in standardization and implementation, in any reasonable way. For this we also support Toni Ballardie's efforts. Automatic tunneling can definitely assist in rapid global multicast deployment. Meir ------------------------------------------- Professor Meir Feder Chief Scientist Bandwiz ==================================================== Automatic Tunneling for Rapid Multicast Deployment ==================================================== Introduction: ============= The intent of this document is to promote rapid multicast deployment. A recent consensus in the multicast community is that source specific multicast [SSM] will be easier to deploy and so it can accelerate multicast acceptance. In order to have rapid SSM deployment throughout the network, we suggest a protocol that will enable multicast even if the routers near the receivers do not support multicast protocols. Further more, this protocol will work from any host, running any operating system, using UDP only. It will discover the nearest SSM-enabled router in the path to a specific source, and create a tunnel between the joining host and that router. This tunnel will be used in order to transfer multicast data for (S,G), from the router to the joining host. Hardware support in routers: ============================ Each SSM-enabled router will have the hardware capability to create a tunnel to arbitrary number of hosts. When a multicast UDP packet is received, it will be duplicated and sent to each entry in the list of (S,G), which may contain both neighboring SSM-enabled routers and tunnels. In the later case, the destination class-D address of the UDP packet will be replaced with the tunnel exit address (A), and the destination port will be replaced with the tunnel exit port (P). There is no need to encapsulate the packet inside another UDP packet. The host can de-multiplex the group (G) from the port (P) by remembering each of the tunnels it created, and assigning different port number (P) for each tunnel coming from a specific source. The original destination port number is gone forever, and cannot be used by the transmitter in order to implement de-multiplexing of any kind at the receivers. This limitation seems to be reasonable, and we do not think that packets should be encapsulated just because of it. Software support in routers: ============================ In order to create tunnels, SSM-enabled routers will be able to receive UDP packets, containing join and leave commands, sent directly to them (using their IP address and a specific port number). These packets will contain the source (S), the group (G), the tunnel exit address (A) and port (P). Upon receiving it, the router will acknowledge the reception, by sending UDP packet to the joining host (A), and add this host to the olist for (S,G). Currently, we do not specify the suggested packet format. It can be [IGMPv3] in UDP, with additional port number. Also, the tunnel should be refreshed from time to time. ** Assuming there is interest in this protocol, we will write an Internet draft specifying the exact details of this tunneling process, and the exact requirements from routers. Detecting the optimal router: ============================= How can the joining host decide which is the optimal router to create a tunnel to? There can be many possible methods, e.g., use manual configuration, use hashing from a pre-defined set of routers, and so on. These methods while not optimal, will work at least as good as the methods for setting the Randevous Points (RP) in PIM-SM. Another method is to use directory services, that will be asked to map (client IP, source IP) to (router IP). The result will be a list of entries containing these fields: 1. Client IP, mask: The group of clients which this entry is applied to. The mask is needed because clients can have temporary IP addresses from the same subnet. 2. Source IP, mask: The source of the multicast packet. This will usually be rentier AS. 3. Router IP, mask: A group of routers that the host can round-robin. 4. Expiration: Time of expiration of this entry. ** Assuming there is an interest in this protocol, we will write an Internet draft specifying the exact details of this DNS process. We can also implement this DNS service world-wide. Detecting the optimal router using trace-route: =============================================== We now suggest an automatic router discovery method, using trace-route. The joining host will use standard trace-route algorithm in order to locate the first router towards the source. Then, it will send a UDP join massage to this router, as defined above. If the router does not acknowledge, the host will check the next router, and so on, until it finds a router that is SSM-enabled. This router will be used for tunneling. The application needs the ability to send UDP packets with small TTL, and the ability to receive ICMP error messages. If the current socket implementation on the host computer cannot support it, the application can spawn the trace-route program itself, and process it's output. This can be done by any host! Optimally, this protocol should be executed for every multicast source. For some applications there is only a single multicast source with a lot of groups, so, this problem doesn't exist. Also, in some cases, access ISPs are connected to the backbone using a single point. Assuming the backbone is SSM-enabled, the output of this process is independent of the source address. The routers can help in this process. When locating an optimal router for a given source, that router can include (in the tunnel acknowledgment message) a list of subnets that it supports. Then, if the host needs to locate a router for each of the subnets, it can use the same router. There is no need to execute this protocol again. In this case the routes might not be optimal, but they are still much better than the routes created using RP in PIM-SM. This protocol is only needed in cases that there is no other option. If there is a multicast enabled router on the host's LAN, it can be detected using limited broadcast of UDP packet to the LAN. This is needed if the operating system is old. If both the routers and the operating system is up-to-date, standard [IGMPv3] can be used. Changes to the applications: ============================ Each application should be linked with a library for multicast join and leave. This library will check whether the operating system supports [IGMPv3]. If it is supported, it will be used. If [IGMPv3] is not supported, the library will do limited broadcast of UDP packet in order to see if there is a SSM-enabled router on the LAN. If such a router exists, it will use it to join the multicast group. In all other cases, the optimal router will be detected, and a tunnel will be crated to that router. ** Assuming there is interest in this protocol, we will implement this library, as an open-source code. It will utilize the OS [IGMPv3], LAN limited broadcast, or create a tunnel. It will locate the router for the tunnel by using directory services or by the trace-route algorithm. Benefits: ========= From the application point of view, the automatic tunneling feature opens multicast immediately, even in the extreme case, where only the joining hosts and the source support it, and it is effectively unicast. All the application need to do is to call join / leave functions, and receive packets. Later, when the routers are updated, things will become more efficient, of course. Automatic tunneling can initiate a process and provide an incentive for wide spread multicast deployment at the routers. By enabling an immediate multicast to applications, routers that are not multicast enabled will suffer a larger load, while the multicast enabled routers will require less computational power since they receive a fewer number of packets from the next-hop router. This creates a positive-feedback that will cause most routers, especially in the critical areas, to be SSM-enabled. Acknowledgement ================ This document benefited a lot from discussions and specific comments of Radia Perlman and Jon Crowcroft. Useful discussion with Suchi Raman are also acknowledged. References: =========== [ISM] S. Deering, "Host Extensions for IP Multicasting". http://www.ietf.org/rfc/rfc1112.txt [IGMPv3] B. Cain, S. Deering, I. Kouvelas, A. Thyagarajan, "Internet Group Management Protocol, Version 3", Work in Progress. http://www.ietf.org/internet-drafts/draft-ietf-idmr-igmp-v3-04.txt [PIM-SM] B. Fenner, M. Handley, H. Holbrook, I. Kouvelas, "Protocol Independent Multicast - Sparse Mode (PIM-SM)", Work in Progress. http://www.ietf.org/internet-drafts/draft-ietf-pim-sm-v2-new-00.txt [SSM] H. Holbrook, B. Cain, "Source-Specific Multicast for IP", Work in Progress. http://www.ietf.org/internet-drafts/draft-holbrook-ssm-00.txt [PIM-SO] N. Bhaskar, I. Kouvelas, "Source-Specific Protocol Independent Multicast", Work in Progress. http://www.ietf.org/internet-drafts/draft-bhaskar-pim-ss-00.txt [PIM-SS] S. Bhattacharyya, C. Diot, L. Giuliano, R. Rockell, "Deployment of PIM-SO at Sprint", Work in Progress. http://www.ietf.org/internet-drafts/draft-bhattach-diot-pimso-00.txt Author's Address: ================= Doron Rajwan BandWiz Inc. doron@bandwiz.com Meir Feder BandWiz Inc. meir@bandwiz.com ---------- Forwarded message ---------- Date: Tue, 6 Feb 2001 12:29:03 -0500 (EST) From: Radia Perlman - Boston Center for Networking To: ssm-interest@external.cisco.com, maddogs@ietf.org, finlayson@live.com Subject: Re: multicast-transition Re: Ross Finlayson said: Orthogonal to this is the question of how to *find* tunnel endpoints. The simplest solution would be to have this happen automatically, under the assumption that tunnel endpoints will be implemented in (or at least, are colocated with) multicast routers. (Again, we might want to focus solely on SSM as a simplifying assumption here.) ********** Here's a straightforward mechanism that does what you want, and the tunnel endpoint can either be a router or the Root of the tree, allowing someone to host a multicast group before the infrastructure around him is multicast enabled, and not change the mechanism as gradually the routers around him become multicast enabled. Likewise, you can join a group without being in a multicast enabled part of the world and use the same mechanism as you would when your world becomes multicast enabled. As I said, there was an internet draft from some people from a company called Bandwiz, but I don't remember their names, and it was also part of the Simple Multicast draft. But it's easier to understand if just the mechanism is summarized, rather than being part of another draft. Besides, I did a quick search for the Bandwiz internet draft and couldn't find it. So here is a summary. Think of a multicast group as an 8-byte quantity...Root address and group qualifier assigned by the Root. In the case of SSM, the resulting tree is unidirectional, but the important thing is that the Root address is known and the group qualifier need not be universally coordinated or unique...just unique to that Root which is hosting the group. An application layer process at the joining host sends the equivalent of a PIM join message saying "join (R,G)". That message has an IP header with destination=R (the tree root), and an IP option that might be slow-pathed by non-multicast routers, but will be forwarded (performance is not critical on a join message...once the tree is set up, data can be fast pathed). There are other encodings, like a new "protocol" (IPv4) or "next header" (IPv6 terminology)...just so long as an "old" router will forward it towards the Root, and a "new router" can know to trap the message and process it. The first multicast aware router along the path notices the message and creates a tunnel to the source address in the IP header. In the worst case, where only the Root and the joining endnodes are multicast enabled for this form of multicast, the tunnel is automatically formed between the receiver and the Root. The more routers that get upgraded, the fewer tunnels there are, so eventually it's really multicast rather than n unicast messages sent by the Root. And it's trivial to cause an endnode to be multicast enabled, since it's a user-level process that can send the join. The join can look the same as a router join. And this approach has the advantage, as the Bandwiz person pointed out, that the sender won't bother sending if nobody has joined the group. And this approach forms the minimal number of tunnels. This approach could also hop over routers that have run out of room to keep state. And I believe people have also proposed ways of reducing fanout at a node with too many tunnels by having a multiple tunnel endpoint tell some of the other nodes to tunnel to each other first to consolidate tunnels. Don't remember where that was written up. Perhaps only in an email message on some list. Radia From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Wed Feb 7 19:43:48 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id TAA13114 for ; Wed, 7 Feb 2001 19:43:47 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id PAA03673 for ; Wed, 7 Feb 2001 15:37:34 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f17NbKZ16276 for ; Wed, 7 Feb 2001 15:37:20 -0800 (PST) Received: from mailweb17.rediffmail.com (IDENT:qmailr@[203.199.83.141]) by proxy3.cisco.com (8.11.2/8.11.2) with SMTP id f17NbKx25241 for ; Wed, 7 Feb 2001 15:37:20 -0800 (PST) Received: (qmail 12238 invoked by uid 510); 7 Feb 2001 23:28:05 -0000 Date: 7 Feb 2001 23:28:05 -0000 Message-ID: <20010207232805.12237.qmail@mailweb17.rediffmail.com> Received: from unknown (134.193.111.186) by rediffmail.com via HTTP; 07 Feb 2001 23:28:05 -0000 MIME-Version: 1.0 To: "ssm-interest@external.cisco.com" Subject: include me! From: "hitesh ruparel" Content-ID: Content-type: text/plain Content-Description: Body Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit dear sir.. i would like information on ssm as it is my area of interest... Kindly add me to this one... thanx cheers hitesh _____________________________________________________ Chat with your friends as soon as they come online. Get Rediff Bol at http://bol.rediff.com From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Wed Feb 7 20:55:24 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id UAA14100 for ; Wed, 7 Feb 2001 20:55:23 -0500 (EST) Received: from cisco.com (omega.cisco.com [171.69.26.42]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id QAA29729 for ; Wed, 7 Feb 2001 16:56:52 -0800 (PST) Received: (from eckert@localhost) by cisco.com (8.8.8-Cisco List Logging/8.8.8) id QAA11842; Wed, 7 Feb 2001 16:56:06 -0800 (PST) From: Toerless Eckert Message-Id: <200102080056.QAA11842@cisco.com> Subject: Re: include me! To: hruparel@rediffmail.com (hitesh ruparel) Date: Wed, 7 Feb 2001 16:56:06 -0800 (PST) Cc: ssm-interest@external.cisco.com (ssm-interest@external.cisco.com) In-Reply-To: <20010207232805.12237.qmail@mailweb17.rediffmail.com> from "hitesh ruparel" at Feb 07, 2001 11:28:05 PM X-Mailer: ELM [version 2.5 PL1] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit > dear sir.. > > i would like information on ssm as it is my area of interest... > > Kindly add me to this one... See http://www.ietf.org/html.charters/ssm-charter.html on how to subscribe, see http://www.aciri.org/fenner/mcast/ssm/html-archive/ for an archive of the mailing list. Thanks ------------------------------------------------------------------------------ Toerless Eckert cisco Systems Inc. Software Engineer IP Multicast 125 Rio Robles (Building N) IOS Network Protocols San Jose, 95134 CA, USA E-Mail: eckert@cisco.com Tel: +1 408 853 5856, FAX: +1 408 526 4952 From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 8 08:35:05 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id IAA06600 for ; Thu, 8 Feb 2001 08:35:04 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id EAA23027 for ; Thu, 8 Feb 2001 04:05:21 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f18C58e06790 for ; Thu, 8 Feb 2001 04:05:08 -0800 (PST) Received: from relay1.alcatel.be (alc119.alcatel.be [195.207.101.119]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f18C55U18620 for ; Thu, 8 Feb 2001 04:05:05 -0800 (PST) Received: from Bemail06.net.alcatel.be (localhost [127.0.0.1]) by relay1.alcatel.be (8.10.1/8.10.1) with SMTP id f18BoDh15837; Thu, 8 Feb 2001 12:50:14 +0100 (MET) Received: from alcatel.be ([138.203.253.241]) by Bemail06.net.alcatel.be (Lotus SMTP MTA v4.6.7 (934.1 12-30-1999)) with SMTP id C12569ED.0040F78B; Thu, 8 Feb 2001 12:49:37 +0100 Message-ID: <3A82824B.CF800EEE@alcatel.be> Date: Thu, 08 Feb 2001 12:26:03 +0100 From: Dirk Ooms X-Mailer: Mozilla 4.61 [en] (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: "ssm-interest@external.cisco.com" , "maddogs@ietf.org" Subject: Re: multicast-transition References: <3A7E7E28.F319258B@alcatel.be> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit As people start drafting 'multicast-transition' schemes, I would like to stress that it would be nice that the IGMP extensions at both ends of the 'multicast path' would be the same, so that in the case of the absence of a multicast network inbetween source and receiver it works transparantly. +- -+ +---+ | +---+ | +---+ +---+ +---+ +---+ |src|----|--|ucr|--|----|mcr|------|mcr|-----|ucr|-----|rcv| +---+ | +---+ | +---+ +---+ +---+ +---+ +- -+ Doron's IGMP++ MBone Tony's IGMP++ <---------------------><----------><-------------------> dirk From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Thu Feb 8 10:58:08 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id KAA11238 for ; Thu, 8 Feb 2001 10:58:08 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id GAA00908 for ; Thu, 8 Feb 2001 06:19:58 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f18EJt428001 for ; Thu, 8 Feb 2001 06:19:55 -0800 (PST) Received: from relay1.alcatel.be (alc119.alcatel.be [195.207.101.119]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f18EJqc05377 for ; Thu, 8 Feb 2001 06:19:52 -0800 (PST) Received: from Bemail06.net.alcatel.be (localhost [127.0.0.1]) by relay1.alcatel.be (8.10.1/8.10.1) with SMTP id f18E58Y17555; Thu, 8 Feb 2001 15:05:08 +0100 (MET) Received: from alcatel.be ([138.203.253.238]) by Bemail06.net.alcatel.be (Lotus SMTP MTA v4.6.7 (934.1 12-30-1999)) with SMTP id C12569ED.004D5A65; Thu, 8 Feb 2001 15:04:54 +0100 Message-ID: <3A82A708.A76785E9@alcatel.be> Date: Thu, 08 Feb 2001 15:02:48 +0100 From: Dirk Ooms X-Mailer: Mozilla 4.61 [en] (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: "ssm-interest@external.cisco.com" , "maddogs@ietf.org" Subject: Re: multicast-transition References: <3A7E7E28.F319258B@alcatel.be> <3A82824B.CF800EEE@alcatel.be> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Or even more general: IGMP could also be used between two non-connected multicast islands. Dirk Ooms wrote: > > As people start drafting 'multicast-transition' schemes, I would like to > stress that it would be nice that the IGMP extensions at both ends of > the 'multicast path' would be the same, so that in the case of the > absence of a multicast network inbetween source and receiver it works > transparantly. > > +- -+ > +---+ | +---+ | +---+ +---+ +---+ +---+ > |src|----|--|ucr|--|----|mcr|------|mcr|-----|ucr|-----|rcv| > +---+ | +---+ | +---+ +---+ +---+ +---+ > +- -+ > > Doron's IGMP++ MBone Tony's IGMP++ > <---------------------><----------><-------------------> > > dirk From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Fri Feb 9 05:11:42 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id FAA13291 for ; Fri, 9 Feb 2001 05:11:41 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id BAA22926 for ; Fri, 9 Feb 2001 01:04:44 -0800 (PST) From: w-itonaga@ab.jp.nec.com Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1994lV09068 for ; Fri, 9 Feb 2001 01:04:47 -0800 (PST) Received: from TYO201.gate.nec.co.jp (TYO201.gate.nec.co.jp [202.32.8.214]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1994eZ11902 for ; Fri, 9 Feb 2001 01:04:41 -0800 (PST) Received: from mailgate4.nec.co.jp ([10.7.69.193]) by TYO201.gate.nec.co.jp (8.9.3/3.7W00121312) with ESMTP id RAA07312 for ; Fri, 9 Feb 2001 17:59:38 +0900 (JST) Received: from mailsv4.nec.co.jp (mailgate51.nec.co.jp [10.7.69.190]) by mailgate4.nec.co.jp (8.9.3/3.7W-MAILGATE-NEC) with ESMTP id RAA29735 for ; Fri, 9 Feb 2001 17:58:30 +0900 (JST) Received: from ipnmail.ipn.abk.nec.co.jp (ipnmail.ipn.abk.nec.co.jp [10.42.124.102]) by mailsv4.nec.co.jp (8.9.3/3.7W-MAILSV4-NEC) with ESMTP id RAA01346 for ; Fri, 9 Feb 2001 17:59:16 +0900 (JST) Received: from mailsv2.ipn.abk.nec.co.jp by ipnmail.ipn.abk.nec.co.jp (8.8.8+2.7Wbeta7/3.6W05/29/98) id RAA03949 for ; Fri, 9 Feb 2001 17:57:46 +0900 (JST) Received: from ipnc091 (ipnc140.ipn.abk.nec.co.jp [10.42.72.140]) by mailsv2.ipn.abk.nec.co.jp (8.9.3/3.7W-mailsv2) with SMTP id RAA16736 for ; Fri, 9 Feb 2001 17:57:39 +0900 To: ssm-interest@external.cisco.com Subject: RE: multicast-transition (fwd) Date: Fri, 09 Feb 2001 17:55:26 +0900 Message-Id: <20010209175552w-itonaga@ab.jp.nec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: WeMail32[1.82] ID:DENSOU Content-Transfer-Encoding: 7bit I think the trace-route method is not useful because host has to send packets untill finding an edge multicast router. How about the IP alert option method? By this method, host will send an UDP packet to S only once. >Detecting the optimal router using trace-route: >=============================================== >We now suggest an automatic router discovery method, using trace-route. The >joining host will use standard trace-route algorithm in order to locate the >first router towards the source. Then, it will send a UDP join massage to >this router, as defined above. If the router does not acknowledge, the host >will check the next router, and so on, until it finds a router that is >SSM-enabled. This router will be used for tunneling. Wataru From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Fri Feb 9 08:15:45 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id IAA15654 for ; Fri, 9 Feb 2001 08:15:44 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id EAA07087 for ; Fri, 9 Feb 2001 04:12:26 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f19CC8b13896 for ; Fri, 9 Feb 2001 04:12:08 -0800 (PST) Received: from missouri.yamato.ibm.com (missouri.yamato.ibm.com [203.141.89.179]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f19CC7Z29260 for ; Fri, 9 Feb 2001 04:12:08 -0800 (PST) Received: from kyoto.yamato.ibm.com (kyoto.yamato.ibm.com [9.68.27.152]) by missouri.yamato.ibm.com (8.11.2/8.11.2) with ESMTP id f19C6sx29194 for ; Fri, 9 Feb 2001 21:06:54 +0900 Received: from localhost (ymtlogin1.yamato.ibm.com [9.68.80.207]) by kyoto.yamato.ibm.com (8.11.1/3.7W) with ESMTP id f19C6sP57216; Fri, 9 Feb 2001 21:06:54 +0900 To: ssm-interest@external.cisco.com Cc: asaeda@yamato.ibm.com Subject: RE: multicast-transition (fwd) In-Reply-To: Your message of "Fri, 09 Feb 2001 17:55:26 +0900" <20010209175552w-itonaga@ab.jp.nec.com> References: <20010209175552w-itonaga@ab.jp.nec.com> X-Mailer: Mew version 1.93 on Emacs 19.28 / Mule 2.3 (SUETSUMUHANA) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: <20010209210654Z.asaeda@yamato.ibm.com> Date: Fri, 09 Feb 2001 21:06:54 +0900 (JST) From: Hitoshi Asaeda X-Dispatcher: imput version 980905(IM100) Lines: 59 Content-Transfer-Encoding: 7bit It must be too early to tell my detail design, though. I've been doing my research around this topic, to implement SSM very easily. My idea just uses modified IGMP and may not require multicast routing protocol. Protocol changes are; o. Modified IGMP defines new three IGMP types, IGMP Reply, IGMP Ack, and IGMP Data. o. Modified IGMP can be sent as a unicast packet. e.g., as for receiver's join, followings are basic deals; o. Receiver just sends IGMP Report(Join) to an interesting sender by unicast. o. Sender tries to send IGMP Reply back toward the receiver after receiving IGMP Report(Join). o. A new-IGMP-capable-intermediate router located between sender and receiver steals this IGMP Reply and sends IGMP Ack back to the source address of the Reply packet. o. Above intermediate router creates (S,G) state which consists of iif, oif list, and destination list. (oif is given by unicast routing table, or MRIB if you want to use additional multicast routing protocol.) o. Above intermediate router sends IGMP Reply toward the receiver continuously. o. After sender receives IGMP Ack, he sends IGMP Data which encapsulates IGMP header and UDP data to Ack sender. o. Destination address of IGMP Data can be changed according to the next destination (i.e. neighbor node to forward Data). The destination is Ack sender if the neighbor is not on a same LAN, and it is G if the neighbor is on a same LAN. o. ... My proposal has several important points. 1. It doesn't require any multicast routing protocol. Only supporting new IGMP by sender and receiver is required. 2. If there is no intermediate router which supports new IGMP within a sender and receiver path, it looks like sender sends unicast packet whose protocol type (ip->ip_p) is IGMP (#2). So, it must be so easy to deploy. 3. Because only unicast route is used and data path is created from the sender toward each receiver, it is very scalable and bi-directional. 4. Not so difficult to implement. (I believe so.) 5. It is easy to implement on IPv6, too. (Specific needs.) 6. It doesn't require some tunneling mechanism. It requires simple encapsulation technique. (You may say I use tunneling but I don't like to say "tunnel", because, to me, tunnel just gives an image to make some stateful or keep track of the connection, anyway.:) Of course, there are some immature/unsolved points. 1. Interoperability between current multicast routing protocol. 2. Scalable timer management. 3. Security.:) ... and so on. Any comments, even objection, would be welcome. -- Hitoshi Asaeda From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Sun Feb 11 03:49:16 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id DAA06266 for ; Sun, 11 Feb 2001 03:49:15 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id XAA22581 for ; Sat, 10 Feb 2001 23:49:03 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1B7mnK00827 for ; Sat, 10 Feb 2001 23:48:49 -0800 (PST) Received: from davis.bandwiz.com ([212.150.220.34]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1B7mQD19231 for ; Sat, 10 Feb 2001 23:48:26 -0800 (PST) Received: by davis.bandwiz.com with Internet Mail Service (5.5.2650.21) id <130GGFYN>; Sun, 11 Feb 2001 09:45:18 +0200 Message-ID: <288F58308EFBD411B896006008F5DCAA3C79@davis.bandwiz.com> From: Doron Rajwan To: Tony Ballardie , Dirk Ooms , Dave Thaler Cc: ssm-interest@external.cisco.com, maddogs@ietf.org Subject: Re: multicast-transition Date: Sun, 11 Feb 2001 09:45:16 +0200 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset="iso-8859-1" Hi everyone, I would like to participate in the effort to define the automatic tunneling mechanism. I think that ANY tunneling method will do, as long as it gives incentive to ISPs to open their network to native multicast. We just need to agree and get it going... The tunneling mechanism I suggested at the SSM meeting in Pittsburgh is different from other tunneling mechanisms in few points / ideas. These ideas are independent, so, you can take whichever you think is right. The second thing I suggested in Pittsburgh was the multicast-on-demand, or, the reverse-IGMP, as Hugh called it. Since the PIM tree ends in the source DR, not the source itself, the source cannot know which groups has listeners. I consider it as a "hole" in the multicast protocols. A future, IGMP v3.1, can fix it. Dirk, I think that this problem is independent of the tunneling problem, and we shouldn't try to tie them together. Tunneling points: ================= 0. TARGET: All 4 cases Ross talked about: old or new OS, old or new first-hop-router. 1. POWERFUL: Every router in the multicast domain will have the ability to be a tunnel end-point. The router will simply "join" the group, and use the tunnel as the output interface. This will give a lot of horse-power to drive the tunnels. 2. NO-HOST-MODIFICATIONS: All the protocols will be user level protocols, i.e., above unicast UDP (including the tunnel creation and destruction). This will allow an application to use tunnels w/o modifying the OS kernel, using raw-sockets, and so. 3. EFFICIENT-DATA-DELIVERY: The IP-in-IP encapsulation method costs a lot of resources, and cause packet fragmentation. This degrades performance a lot. I suggest to simply replace 4 header fields: a. Source IP address will be set to the tunnel end-point address. The original source address is known in the SSM case, since the tunnel was created to deliver this (S,G). In the ASM it is lost forever (that's why I presented it in the SSM in the first place). b. Source port will be set to a well-known port number at the tunnel end-point. The original source port is lost forever, but I do not consider it as a problem. c. Destination IP address will be set to the receiver address. The original multicast group address is known, since the tunnel was created to deliver this address. d. Destination port will be set to a port specified by the receiver. Again, the original destination port is lost forever, but I do not consider it as a problem. 4. NO-MANUAL-CONFIGURATION: Automatic detection of tunnel end-point. Instead of using manual configuration or directory services, I suggested that the application will use the standard "trace-route" algorithm, and then ask each router in the path to the source be a tunnel end-point. The first router that will agree will be taken. In the worst case, the source will always agree. Again, this works only for SSM. thanks, Doron. ______________________________________________ Doron Rajwan, CTO, Bandwiz Inc. 8 Shaul Hameleh Blvd., Tel Aviv 64733, ISRAEL. mailto:doron@bandwiz.com Direct: +972-(3)-6941805 Bandwiz:+972-(3)-6941800 Cell: +972-(56)-507799 Fax: +972-(3)-6941818 Home: +972-(3)-6736614 From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Sun Feb 11 03:50:21 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id DAA06433 for ; Sun, 11 Feb 2001 03:50:21 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id XAA23733 for ; Sat, 10 Feb 2001 23:56:17 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1B7u3M07765 for ; Sat, 10 Feb 2001 23:56:03 -0800 (PST) Received: from davis.bandwiz.com ([212.150.220.34]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1B7u3417311 for ; Sat, 10 Feb 2001 23:56:03 -0800 (PST) Received: by davis.bandwiz.com with Internet Mail Service (5.5.2650.21) id <130GGFYQ>; Sun, 11 Feb 2001 09:52:29 +0200 Message-ID: <288F58308EFBD411B896006008F5DCAA3C7A@davis.bandwiz.com> From: Doron Rajwan To: w-itonaga@ab.jp.nec.com, ssm-interest@external.cisco.com Subject: RE: multicast-transition (fwd) Date: Sun, 11 Feb 2001 09:52:29 +0200 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset="iso-8859-1" I am not sure it is a good tradeoff myself. Still, you can use this method only once per day, and use that selected MBone router for all joins / leaves. IP alert seems better at first, but, it requires host modification. You will need a new version of the OS, a new device driver, or at least raw sockets. The trace-route method does not need it! From application point-of-view, it is better not to require administrator privileges, and reboot. If you do not care about it, the IP alert seems better. Please remember that we see it as a transition, nothing more. Doron. -----Original Message----- From: w-itonaga@ab.jp.nec.com [mailto:w-itonaga@ab.jp.nec.com] Sent: Friday, February 09, 2001 10:55 AM To: ssm-interest@external.cisco.com Subject: RE: multicast-transition (fwd) I think the trace-route method is not useful because host has to send packets untill finding an edge multicast router. How about the IP alert option method? By this method, host will send an UDP packet to S only once. >Detecting the optimal router using trace-route: >=============================================== >We now suggest an automatic router discovery method, using trace-route. The >joining host will use standard trace-route algorithm in order to locate the >first router towards the source. Then, it will send a UDP join massage to >this router, as defined above. If the router does not acknowledge, the host >will check the next router, and so on, until it finds a router that is >SSM-enabled. This router will be used for tunneling. Wataru From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Tue Feb 13 10:22:16 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id KAA21568 for ; Tue, 13 Feb 2001 10:22:16 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id GAA05221 for ; Tue, 13 Feb 2001 06:30:02 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1DEU5511308 for ; Tue, 13 Feb 2001 06:30:05 -0800 (PST) Received: from sky.irisa.fr (sky.irisa.fr [131.254.60.147]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1DETxb28132 for ; Tue, 13 Feb 2001 06:29:59 -0800 (PST) Received: from irisa.fr (rocha.irisa.fr [131.254.13.52]) by sky.irisa.fr (8.9.3/8.9.3) with ESMTP id PAA16119 for ; Tue, 13 Feb 2001 15:14:57 +0100 (MET) Message-ID: <3A894165.A1E6EE8C@irisa.fr> Date: Tue, 13 Feb 2001 15:15:01 +0100 From: Ali Boudani Organization: INRIA - RENNES X-Mailer: Mozilla 4.75 [en] (WinNT; U) X-Accept-Language: en, fr MIME-Version: 1.0 To: ssm-interest@external.cisco.com Subject: SSM Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit hello, what will happen if two source want to send messages to the same group ?? Isnt that the same case for many to many in ?? Thanx From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Tue Feb 13 11:56:22 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id LAA23993 for ; Tue, 13 Feb 2001 11:56:21 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id IAA24304 for ; Tue, 13 Feb 2001 08:09:36 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1DG9Ic25434 for ; Tue, 13 Feb 2001 08:09:18 -0800 (PST) Received: from multicasttech.com (IDENT:root@garcia.multicasttech.com [63.105.122.8]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1DG9EY27545 for ; Tue, 13 Feb 2001 08:09:15 -0800 (PST) Received: from [63.105.122.212] (HELO 21rst-century.com) by multicasttech.com (CommuniGate Pro SMTP 3.3.2) with ESMTP id 760472; Tue, 13 Feb 2001 11:03:17 -0500 Message-ID: <3A895AC8.13A069B8@21rst-century.com> Date: Tue, 13 Feb 2001 11:03:20 -0500 From: Marshall Eubanks Reply-To: tme@21rst-century.com Organization: Multicast Technologies X-Mailer: Mozilla 4.7C-CCK-MCD {C-UDP; EBM-APPLE} (Macintosh; I; PPC) X-Accept-Language: en MIME-Version: 1.0 To: Ali Boudani CC: ssm-interest@external.cisco.com Subject: Re: SSM References: <3A894165.A1E6EE8C@irisa.fr> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit If there are no receivers, the source traffic will die at the first hop router. It there are receivers, they have requested specific IP addresses, so the (S,G) are different. This is in no way the same as a many to many (*,G) group setup, where any source can join the group. Marshall Ali Boudani wrote: > > hello, > what will happen if two source want to send messages to the same group > ?? > Isnt that the same case for many to many in ?? > Thanx -- Regards Marshall Eubanks Multicast Technologies, Inc. 10301 Democracy Lane, Suite 201 Fairfax, Virginia 22030 Phone : 703-293-9624 Fax : 703-293-9609 e-mail : tme@on-the-i.com http://www.on-the-i.com From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Wed Feb 14 10:42:43 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id KAA03108 for ; Wed, 14 Feb 2001 10:42:43 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id GAA15267 for ; Wed, 14 Feb 2001 06:47:28 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1EElOt09712 for ; Wed, 14 Feb 2001 06:47:24 -0800 (PST) Received: from iscserv1.res.sprintlink.net (gate2.sprintlink.net [199.0.233.3]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1EElP710136 for ; Wed, 14 Feb 2001 06:47:26 -0800 (PST) Received: from localhost (jschoch@localhost) by iscserv1.res.sprintlink.net (8.8.8+Sun/8.6.12) with ESMTP id JAA17543 for ; Wed, 14 Feb 2001 09:33:55 -0500 (EST) X-Authentication-Warning: iscserv1.res.sprintlink.net: jschoch owned process doing -bs Date: Wed, 14 Feb 2001 09:33:55 -0500 (EST) From: Jeff Schoch X-Sender: jschoch@iscserv1 To: ssm-interest@external.cisco.com Subject: Using DNS for SSM Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Hi! I've just submitted a draft which I think the SSM working group should be interested in. It can be found at: http://www.ietf.org/internet-drafts/draft-schoch-dns-ssm-00.txt It's a relatively short, five page read. Please feel free to send any comments to Sunny and me. Thanks for you time and attention. Jeff Schoch jschoch@sprint.net Operations Engineering 703-689-7716 From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Wed Feb 14 12:52:08 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id MAA09050 for ; Wed, 14 Feb 2001 12:52:07 -0500 (EST) Received: from ce-nfs-1.cisco.com (ce-nfs-1.cisco.com [171.68.202.251]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id JAA05341 for ; Wed, 14 Feb 2001 09:09:31 -0800 (PST) Received: from glock (dhcp-161-44-19-38.cisco.com [161.44.19.38]) by ce-nfs-1.cisco.com (8.8.8+Sun/8.8.8) with SMTP id JAA03940; Wed, 14 Feb 2001 09:09:12 -0800 (PST) Message-ID: <006101c096a8$da572430$26132ca1@glock> From: "Stephen Sprunk" To: "Jeff Schoch" Cc: , References: Subject: Re: Using DNS for SSM Date: Wed, 14 Feb 2001 11:09:03 -0600 Organization: Cisco Systems, Inc. MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Content-Transfer-Encoding: 7bit Thus spake "Jeff Schoch" > I've just submitted a draft which I think the SSM working group should > be interested in. It can be found at: > http://www.ietf.org/internet-drafts/draft-schoch-dns-ssm-00.txt > > It's a relatively short, five page read. Please feel free to send any > comments to Sunny and me. Thanks for you time and attention. I don't see the rationale for making the source the primary key and the channels the secondary keys. I think apps will more likely know the channel (DNS name) and want a listing of servers. Have you considered using some variation of SRV records so that you can specify port numbers per server? Depending on how you do it, this would eliminate the need for a magic ".mcast." in the hostname. > Jeff Schoch jschoch@sprint.net > Operations Engineering 703-689-7716 S | | Stephen Sprunk, K5SSS, CCIE #3723 :|: :|: Network Design Consultant, GSOLE :|||: :|||: New office: RCDN2 in Richardson, TX .:|||||||:..:|||||||:. Email: ssprunk@cisco.com From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Wed Feb 14 15:04:02 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id PAA15286 for ; Wed, 14 Feb 2001 15:04:01 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id LAA15268 for ; Wed, 14 Feb 2001 11:08:38 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1EJ8J804685 for ; Wed, 14 Feb 2001 11:08:19 -0800 (PST) Received: from iscserv1.res.sprintlink.net (gate2.sprintlink.net [199.0.233.3]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1EJ7q103985 for ; Wed, 14 Feb 2001 11:07:52 -0800 (PST) Received: from localhost (jschoch@localhost) by iscserv1.res.sprintlink.net (8.8.8+Sun/8.6.12) with ESMTP id NAA02240; Wed, 14 Feb 2001 13:54:47 -0500 (EST) X-Authentication-Warning: iscserv1.res.sprintlink.net: jschoch owned process doing -bs Date: Wed, 14 Feb 2001 13:54:46 -0500 (EST) From: Jeff Schoch X-Sender: jschoch@iscserv1 To: Stephen Sprunk cc: ssm-interest@external.cisco.com Subject: Re: Using DNS for SSM In-Reply-To: <006101c096a8$da572430$26132ca1@glock> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII By channel, you mean the Group, right? The rationale is the assumption that there will be more Groups than Sources. This may not be a valid assumption in all cases, but isn't a good chunk of the usefulness of multicast protocols to allow fewer resources to provide more services? Using the hierarchy of most DNS lookups as they are used today (right to left becoming more specific) it seemed logical to process the records that way. As for for the SRV records, we will explore that as a possibility to somehow point to the Source. We're going to test this out some. But do most clients support that type of record? The information I saw stated that some clients do not support SRV records (maybe Microsoft?). In writing this draft, we were looking for solutions which call for the least number of changes in existing infrastructures, and therefore if the SRV record functionality would have to be changed in servers or clients, this option would be less attractive. Thank you for your input. We will keep it in mind. Jeff Schoch jschoch@sprint.net Operations Engineering 703-689-7716 On Wed, 14 Feb 2001, Stephen Sprunk wrote: > Thus spake "Jeff Schoch" > > I've just submitted a draft which I think the SSM working group should > > be interested in. It can be found at: > > http://www.ietf.org/internet-drafts/draft-schoch-dns-ssm-00.txt > > > > It's a relatively short, five page read. Please feel free to send any > > comments to Sunny and me. Thanks for you time and attention. > > I don't see the rationale for making the source the primary key and the > channels the secondary keys. I think apps will more likely know the > channel (DNS name) and want a listing of servers. > > Have you considered using some variation of SRV records so that you can > specify port numbers per server? Depending on how you do it, this would > eliminate the need for a magic ".mcast." in the hostname. > > > Jeff Schoch jschoch@sprint.net > > Operations Engineering 703-689-7716 > > S > > | | Stephen Sprunk, K5SSS, CCIE #3723 > :|: :|: Network Design Consultant, GSOLE > :|||: :|||: New office: RCDN2 in Richardson, TX > .:|||||||:..:|||||||:. Email: ssprunk@cisco.com > > From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Wed Feb 14 15:42:33 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id PAA16383 for ; Wed, 14 Feb 2001 15:42:32 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id MAA13471 for ; Wed, 14 Feb 2001 12:00:29 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1EK06609587 for ; Wed, 14 Feb 2001 12:00:16 -0800 (PST) Received: from postal.jnpr.net (natint.juniper.net [207.17.136.129]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1EJxZ101705 for ; Wed, 14 Feb 2001 11:59:35 -0800 (PST) Received: by postal.jnpr.net with Internet Mail Service (5.5.2653.19) id <156N3ZM0>; Wed, 14 Feb 2001 11:58:23 -0800 Message-ID: From: Sunny Schoch To: "'Stephen Sprunk'" , Jeff Schoch Cc: ssm-interest@external.cisco.com Subject: RE: Using DNS for SSM Date: Wed, 14 Feb 2001 11:58:22 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" > I don't see the rationale for making the source the primary > key and the > channels the secondary keys. I think apps will more likely know the > channel (DNS name) and want a listing of servers. This method does not prevent multicast providers from configuring multiple A records if they have multiple servers for one channel. Users only need to know the channel name and DNS server will resolve to one of the A records. > Have you considered using some variation of SRV records so > that you can > specify port numbers per server? Depending on how you do it, > this would > eliminate the need for a magic ".mcast." in the hostname. No, we haven't considered that. We'll look into it more. Thanks! Sunny > > > Jeff Schoch jschoch@sprint.net > > Operations Engineering 703-689-7716 > > S > > | | Stephen Sprunk, K5SSS, CCIE #3723 > :|: :|: Network Design Consultant, GSOLE > :|||: :|||: New office: RCDN2 in Richardson, TX > .:|||||||:..:|||||||:. Email: ssprunk@cisco.com > > From owner-extdom.ssm-interest@rtp-msg-core-1.cisco.com Wed Feb 14 16:09:54 2001 Received: from rtp-msg-core-1.cisco.com (rtp-msg-core-1.cisco.com [161.44.11.97]) by ietf.org (8.9.1a/8.9.1a) with SMTP id QAA16939 for ; Wed, 14 Feb 2001 16:09:53 -0500 (EST) Received: from ce-nfs-1.cisco.com (ce-nfs-1.cisco.com [171.68.202.251]) by rtp-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id OAA16268 for ; Wed, 14 Feb 2001 14:56:02 -0500 (EST) Received: from glock (dhcp-161-44-19-38.cisco.com [161.44.19.38]) by ce-nfs-1.cisco.com (8.8.8+Sun/8.8.8) with SMTP id LAA20608; Wed, 14 Feb 2001 11:56:30 -0800 (PST) Message-ID: <00e001c096c0$39724050$26132ca1@glock> From: "Stephen Sprunk" To: "Jeff Schoch" Cc: References: Subject: Re: Using DNS for SSM Date: Wed, 14 Feb 2001 13:56:15 -0600 Organization: Cisco Systems, Inc. MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Content-Transfer-Encoding: 7bit Thus spake "Jeff Schoch" > By channel, you mean the Group, right? Most of the drafts are using "channel" instead of "group" for SSM addresses since group implies many senders. > The rationale is the assumption that there will be more Groups than > Sources. This may not be a valid assumption in all cases, but isn't a > good chunk of the usefulness of multicast protocols to allow fewer > resources to provide more services? I'm questioning whether a given service is more commonly identified by the channel name or the source name/ip. In most cases I can think of, the app knows what service the user wants and needs to determine who offers it; it's a rare case where it knows the source and not the service. > Using the hierarchy of most DNS lookups as they are used today > (right to left becoming more specific) it seemed logical to process the > records that way. Right; I'm just thinking in a service-centric model instead of a source-centric model. > As for for the SRV records, we will explore that as a possibility to > somehow point to the Source. We're going to test this out some. I was thinking something like: $ORIGIN example.com. ; SOA, etc video-1 A 232.1.2.3 rtp.udp.video-1 SRV 0 0 43210 server.example.com. rtp.udp.video-1 SRV 10 0 34567 backup-server.example.com. server A 192.168.1.2 backup-server A 192.168.3.4 Further distinctions might be needed for video/audio streams instead of a generic "rtp" protocol type since the two streams usually come from different ports and/or servers but would probably use the same channel name. Or perhaps the semantics should be modified such that *all* SRVs for the priority level should be accessed, assuming there's one SRV for each stream? > But do most clients support that type of record? The information I > saw stated that some clients do not support SRV records (maybe > Microsoft?). Client apps will need to be retooled for IGMPv3 anyways, so adding SRV support (just a different call to res_*) doesn't seem onerous. > In writing this draft, we were looking for solutions which call for the > least number of changes in existing infrastructures, and therefore if > the SRV record functionality would have to be changed in servers or > clients, this option would be less attractive. Recent BINDs handle SRV easily; older versions can pass them along but can't parse zone files with them. Microsoft's Active Directory uses SRV records extensively. I'm not sure backwards compatibility with clients is a large issue; how many existing SSM clients (or even ISM clients) are out there? S | | Stephen Sprunk, K5SSS, CCIE #3723 :|: :|: Network Design Consultant, GSOLE :|||: :|||: New office: RCDN2 in Richardson, TX .:|||||||:..:|||||||:. Email: ssprunk@cisco.com From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Wed Feb 14 18:25:29 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id SAA18763 for ; Wed, 14 Feb 2001 18:25:29 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id OAA21175 for ; Wed, 14 Feb 2001 14:31:03 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1EMUxM01279 for ; Wed, 14 Feb 2001 14:30:59 -0800 (PST) Received: from bells.cs.ucl.ac.uk (bells.cs.ucl.ac.uk [128.16.5.31]) by proxy1.cisco.com (8.11.2/8.11.2) with SMTP id f1EMUvA19038 for ; Wed, 14 Feb 2001 14:30:57 -0800 (PST) Received: from sonic.cs.ucl.ac.uk by bells.cs.ucl.ac.uk with local SMTP id ; Wed, 14 Feb 2001 22:25:40 +0000 To: Sunny Schoch cc: "'Stephen Sprunk'" , Jeff Schoch , ssm-interest@external.cisco.com, J.Crowcroft@cs.ucl.ac.uk Subject: Re: Using DNS for SSM In-reply-to: Your message of "Wed, 14 Feb 2001 11:58:22 PST." Date: Wed, 14 Feb 2001 22:25:38 +0000 Message-ID: <9964.982189538@cs.ucl.ac.uk> From: Jon Crowcroft simpler use ipv6 a records then we are future proof. In message , Sunny Sc hoch typed: >>> I don't see the rationale for making the source the primary >>> key and the >>> channels the secondary keys. I think apps will more likely know the >>> channel (DNS name) and want a listing of servers. >>This method does not prevent multicast providers from configuring multiple A >>records if they have multiple servers for one channel. Users only need to >>know the channel name and DNS server will resolve to one of the A records. >> >>> Have you considered using some variation of SRV records so >>> that you can >>> specify port numbers per server? Depending on how you do it, >>> this would >>> eliminate the need for a magic ".mcast." in the hostname. >>No, we haven't considered that. We'll look into it more. >> >>Thanks! >>Sunny >> >>> >>> > Jeff Schoch jschoch@sprint.net >>> > Operations Engineering 703-689-7716 >>> >>> S >>> >>> | | Stephen Sprunk, K5SSS, CCIE #3723 >>> :|: :|: Network Design Consultant, GSOLE >>> :|||: :|||: New office: RCDN2 in Richardson, TX >>> .:|||||||:..:|||||||:. Email: ssprunk@cisco.com >>> >>> cheers jon From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 15 09:42:23 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id JAA19018 for ; Thu, 15 Feb 2001 09:42:22 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id FAA06534 for ; Thu, 15 Feb 2001 05:33:27 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1FDXAF20397 for ; Thu, 15 Feb 2001 05:33:10 -0800 (PST) Received: from cs.huji.ac.il (exim@cs.huji.ac.il [132.65.16.10]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1FDWgw12243 for ; Thu, 15 Feb 2001 05:32:42 -0800 (PST) Received: from inferno-01.cs.huji.ac.il ([132.65.32.101] ident=mail) by cs.huji.ac.il with esmtp (Exim 3.20 #1) id 14TOS0-0003XP-00; Thu, 15 Feb 2001 15:28:00 +0200 Received: from osnaty by inferno-01.cs.huji.ac.il with local (Exim 3.16 #1) id 14TOS0-0003ya-00; Thu, 15 Feb 2001 15:28:00 +0200 Date: Thu, 15 Feb 2001 15:28:00 +0200 (IST) From: Osnat Mokryn To: Stephen Sprunk cc: Jeff Schoch , ssm-interest@external.cisco.com, sunny@juniper.net Subject: Re: Using DNS for SSM In-Reply-To: <006101c096a8$da572430$26132ca1@glock> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII On Wed, 14 Feb 2001, Stephen Sprunk wrote: > Thus spake "Jeff Schoch" > > I've just submitted a draft which I think the SSM working group should > > be interested in.It can be found at: > > http://www.ietf.org/internet-drafts/draft-schoch-dns-ssm-00.txt > > > > It's a relatively short, five page read.Please feel free to send any > > comments to Sunny and me.Thanks for you time and attention. > > I don't see the rationale for making the source the primary key and the > channels the secondary keys.I think apps will more likely know the > channel (DNS name) and want a listing of servers. I agree. Furthermore, I think that the domain name should not be changed. Instead of using a new channel naming convention such as MCAST, or any other string, I suggest to use the same domain name and change only the protocol specifier, from HTTP to HTTPM. Thus, people who are used to the site http://www.example.com don't have to go to a new 'mcast.example.com' but rather to a : httpm://www.example.com/url_name where url_name is the multicast channel name. A specific software in the user's side recognizes the 'httpm' specifier, and sends the entire URL to the DNS for resolution, with the 'url_name' concatenated at the end : Since the resolution process looks for the biggest prefix it can match, it does not affect current DNS structure. All is needed is to have special entries for each channel, as in your scheme, which consists of the full domain name + url_name. This also solves the problem of having more than one source per domain name, without changing the domain name. The mapping in this case is: domain name is the group, the URL is the specific source (which conforms with reality, in my opinion). I previously suggested this as part of an overall solution to use multicast to distribute very hot web pages, as can be seen in DIMACS technical report 2000-47. -Ossi Mokryn. > > Have you considered using some variation of SRV records so that you can > specify port numbers per server?Depending on how you do it, this would > eliminate the need for a magic ".mcast." in thehostname. > > > Jeff Schoch jschoch@sprint.net > > Operations Engineering 703-689-7716 > > S > > | | Stephen Sprunk, K5SSS, CCIE #3723 > :|: :|: Network Design Consultant, GSOLE > :|||: :|||: New office: RCDN2 in Richardson, TX > .:|||||||:..:|||||||:. Email: ssprunk@cisco.com > > > :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Osnat (ossi) Mokryn :: tel: +972-2-6585770 Computer Science Institute :: http://www.cs.huji.ac.il/~osnaty Hebrew University :: osnaty@cs.huji.ac.il Jerusalem, Israel :: fax: +972-2-6585439 :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 15 11:38:49 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id LAA22649 for ; Thu, 15 Feb 2001 11:38:49 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id HAA27546 for ; Thu, 15 Feb 2001 07:50:32 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1FFoI806822 for ; Thu, 15 Feb 2001 07:50:18 -0800 (PST) Received: from mail18.domainhost.com ([63.173.19.140]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1FFnpw09499 for ; Thu, 15 Feb 2001 07:49:51 -0800 (PST) Received: from pavillion (w235.z208037159.nyc-ny.dsl.cnc.net [208.37.159.235]) by mail18.domainhost.com (8.9.3/8.9.3) with SMTP id IAA26326; Thu, 15 Feb 2001 08:45:08 -0600 From: "Chandeliers" To: Subject: Joe, Please let me know if you receive this link. AL Date: Thu, 15 Feb 2001 09:44:59 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0148_01C09733.F5FD0520" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Disposition-Notification-To: "Chandeliers" This is a multi-part message in MIME format. ------=_NextPart_000_0148_01C09733.F5FD0520 Content-Type: text/plain; charset="iso-8859-1" X-MIME-Autoconverted: from 8bit to quoted-printable by sj-msg-core-2.cisco.com id HAA27547 Content-Transfer-Encoding: quoted-printable Joe, If you can read this it means you were able to open the email. I received many complaints from people to remove them thinking it was spam.= I don't know why this happened. Well, let me know what you think. Althoug= h the site is running well, I think the prices are too low. Please send regard to Paula and tell her I am looking forward to see you all. Sincerely, Al Mary Engelbreit, Precious Moments and Save the Children novel= ty gifts. All items listed are brand new, current retail items ranging in co= st of $12.99 to $29.99 and you pay up to 70% OFF. Please see our 'INFO' page for more information about us. You will also receive a free gift with your purchase. you may request which category to receive your free gift from, and we will try to accomodate you. Limit one free gift per household per month. PRECIOUS MOMENTS BIRTHSTONE CHARM FEBRUARY Regular price: $12.95 Sale price: $3.50 save the children school bus pin save the children school bus pinRegular price: $14.95 Sale price: $5.50 MARY ENGELBREIT MISS SMARTY PIN Regular price: $14.95 Sale price: $5.50 Sterling Silver Boy Charm Diamond Center Regular price: $19.95 Sale price: $3.50 Copyright =A9 2000 FreeGiftsPlus.com Inc. All rights reserved. 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Joe, If you can read this it means you were = able to=20 open the email.  I received many complaints from people to remove = them=20 thinking it was spam.  I don't know why this happened.  Well, = let me=20 know what you think.  Although the site is running well, I think = the prices=20 are too low.  Please send regard to Paula and tell her I am looking = forward=20 to see you all.
 
Sincerely,
 
Al
 



------=_NextPart_000_0148_01C09733.F5FD0520-- From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 15 19:15:16 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id TAA02692 for ; Thu, 15 Feb 2001 19:15:15 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id OAA04666 for ; Thu, 15 Feb 2001 14:53:40 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1FMrLQ17896 for ; Thu, 15 Feb 2001 14:53:22 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1FMqsw16863 for ; Thu, 15 Feb 2001 14:52:54 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id OAA13589; Thu, 15 Feb 2001 14:50:35 -0800 Date: Thu, 15 Feb 2001 14:50:35 -0800 Message-Id: <200102152250.OAA13589@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: jschoch@sprint.net CC: ssm-interest@external.cisco.com In-reply-to: (message from Jeff Schoch on Wed, 14 Feb 2001 09:33:55 -0500 (EST)) Subject: Re: Using DNS for SSM References: >> I've just submitted a draft which I think the SSM working group should be >> interested in. It can be found at: >> http://www.ietf.org/internet-drafts/draft-schoch-dns-ssm-00.txt An even simpler approach would be to have DNS records like: radio.example.com AA 10.1.1.1.232.1.1.1 then 1) the application has the complete channel address for IGMPv3, and 2) you don't have to require application semantics for a DNS name. And we have existence proofs that adding new record types to DNS (particularly simple ones) is not too much effort. Dino From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 15 19:49:57 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id TAA03134 for ; Thu, 15 Feb 2001 19:49:56 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id PAA13068 for ; Thu, 15 Feb 2001 15:38:36 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1FNcIP10443 for ; Thu, 15 Feb 2001 15:38:18 -0800 (PST) Received: from ack.Berkeley.EDU (ack.Berkeley.EDU [128.32.206.66]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1FNbow06729 for ; Thu, 15 Feb 2001 15:37:50 -0800 (PST) Received: (from lindahl@localhost) by ack.Berkeley.EDU (8.9.3+Sun/8.9.3) id PAA28391; Thu, 15 Feb 2001 15:24:55 -0800 (PST) Date: Thu, 15 Feb 2001 15:24:55 -0800 (PST) From: ken lindahl Message-Id: <200102152324.PAA28391@ack.Berkeley.EDU> To: dino@procket.com, jschoch@sprint.net Subject: Re: Using DNS for SSM Cc: ssm-interest@external.cisco.com On Thu, 15 Feb 2001, Dino Farinacci wrote: >>> I've just submitted a draft which I think the SSM working group should be >>> interested in. It can be found at: >>> http://www.ietf.org/internet-drafts/draft-schoch-dns-ssm-00.txt > > An even simpler approach would be to have DNS records like: > > radio.example.com AA 10.1.1.1.232.1.1.1 > > then 1) the application has the complete channel address for IGMPv3, and 2) > you don't have to require application semantics for a DNS name. > > And we have existence proofs that adding new record types to DNS > (particularly simple ones) is not too much effort. > >Dino this has the distinct advantage of requiring only a single dns query to to get the information, if you're going to add a new RR type, why not add one that specifically has two fields in RDATA, one for source IP and one for group ("channel") IP? simpler still would be to simply have two A records: radio.example.com A 10.1.1.1 radio.example.com A 232.1.1.1 and let the application determine which is source and which is group based on the address range? (i'm prepared for someone to tell me that there are resolvers out there that pass only on A record to the app.) multiple sources is an easy extension: just add more A records with the sources' IP addresses. ken From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 15 20:09:31 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id UAA03421 for ; Thu, 15 Feb 2001 20:09:31 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id PAA04058 for ; Thu, 15 Feb 2001 15:36:45 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1FNaTS15725 for ; Thu, 15 Feb 2001 15:36:29 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1FNa1w06061 for ; Thu, 15 Feb 2001 15:36:01 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id PAA13876; Thu, 15 Feb 2001 15:35:38 -0800 Date: Thu, 15 Feb 2001 15:35:38 -0800 Message-Id: <200102152335.PAA13876@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: lindahl@ack.berkeley.edu CC: jschoch@sprint.net, ssm-interest@external.cisco.com In-reply-to: <200102152324.PAA28391@ack.Berkeley.EDU> (message from ken lindahl on Thu, 15 Feb 2001 15:24:55 -0800 (PST)) Subject: Re: Using DNS for SSM References: <200102152324.PAA28391@ack.Berkeley.EDU> >> simpler still would be to simply have two A records: >> radio.example.com A 10.1.1.1 >> radio.example.com A 232.1.1.1 >> and let the application determine which is source and which is group >> based on the address range? (i'm prepared for someone to tell me that >> there are resolvers out there that pass only on A record to the app.) Yes, this could work and if someone wanted the same source to send tv content, you'd have: tv.example.com A 10.1.1.1 tv.example.com A 232.1.1.2 and if this *only* existed: cartoons.example.com A 232.1.1.1 movies.example.co m A 232.1.1.1 it would be ambiguous (and insufficient) to the application so it would be ignored. However, I was thinking that potential source mirroring would be used so radio.example.com AA 10.1.1.1.232.1.1.1 radio.example.com AA 10.2.2.2.232.1.1.1 radio.west.example.com A 10.1.1.1 radio.east.example.com A 10.2.2.2 might make sense and the members of the mirror would use consistent group addresses for the same content. Dino From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 15 20:11:18 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id UAA03452 for ; Thu, 15 Feb 2001 20:11:17 -0500 (EST) Received: from cisco.com (omega.cisco.com [171.69.26.42]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id PAA20102 for ; Thu, 15 Feb 2001 15:58:32 -0800 (PST) Received: (from eckert@localhost) by cisco.com (8.8.8-Cisco List Logging/8.8.8) id PAA11155; Thu, 15 Feb 2001 15:58:09 -0800 (PST) From: Toerless Eckert Message-Id: <200102152358.PAA11155@cisco.com> Subject: Re: Using DNS for SSM To: dino@procket.com (Dino Farinacci) Date: Thu, 15 Feb 2001 15:58:09 -0800 (PST) Cc: lindahl@ack.berkeley.edu, jschoch@sprint.net, ssm-interest@external.cisco.com In-Reply-To: <200102152335.PAA13876@dino-pc.procket.com> from "Dino Farinacci" at Feb 15, 2001 03:35:38 PM X-Mailer: ELM [version 2.5 PL1] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Can someone explain to me what the urgent need for SSM specific channel addresses is ? I agree that it is a nice-to-have, but such a mapping alone does not allow a user who wants to receive a channel to simply type the address and then receive the content. In the first place, i think the question is: What is a simple to remember URL scheme that is sufficient as a root pointer for a receiver application to automatically get all the session information needed to receive content. With just an S and a G the application doesn't really stand much of a chance. In the web, a FQDN alone is sufficient, because everybody makes the assumption that the access-scheme is HTTP. What is the assumption you would want to make in the streaming media case ? I wouldn't know one. I think the best way to actually solve this issue is to think about some simplification for mappings from URLs onto SDP files, because the SDP file is the only standardised and accepted way to transimit sufficient information (S,G,port,protocol, etc) for a receiver application to be able to receive content. I don't see why in the process of finding a simplified FQDN->URL->SDP mappings you would need to come up with new RR types or even with some new DNS schemes to encode a channel. Now i see a need for DNS encoding of Channels, but just in the reverse direction: If you're running a network and see (S,G) state, you'd probably like to get to the SDP file also to learn about the characteristics of the content. But again, just doing a (S,G)->FQDN mapping doesn't seem to get us much further towards FQDN->SDP. Just my 2cents on this. Toerless From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 15 20:18:30 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id UAA03488 for ; Thu, 15 Feb 2001 20:18:30 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id QAA11175 for ; Thu, 15 Feb 2001 16:14:24 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1G0EDk14843 for ; Thu, 15 Feb 2001 16:14:13 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1G0E7j12815 for ; Thu, 15 Feb 2001 16:14:07 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id QAA14008; Thu, 15 Feb 2001 16:11:36 -0800 Date: Thu, 15 Feb 2001 16:11:36 -0800 Message-Id: <200102160011.QAA14008@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: eckert@cisco.com CC: lindahl@ack.berkeley.edu, jschoch@sprint.net, ssm-interest@external.cisco.com In-reply-to: <200102152358.PAA11155@cisco.com> (message from Toerless Eckert on Thu, 15 Feb 2001 15:58:09 -0800 (PST)) Subject: Re: Using DNS for SSM References: <200102152358.PAA11155@cisco.com> >> Can someone explain to me what the urgent need for SSM specific >> channel addresses is ? I agree that it is a nice-to-have, I don't see any urgency. What gave you that idea? >> channel addresses is ? I agree that it is a nice-to-have, >> but such a mapping alone does not allow a user who wants >> to receive a channel to simply type the address and then receive >> the content. Sure it does. Just like most apps, you can type a DNS name or an address. The Schoch proposal is not forcing apps to use this. Toerless, are you proposing SDP attributes in a DNS record. ;-) Dino From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 15 20:41:34 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id UAA03824 for ; Thu, 15 Feb 2001 20:41:33 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id QAA00723 for ; Thu, 15 Feb 2001 16:13:58 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1G0DgW06728 for ; Thu, 15 Feb 2001 16:13:42 -0800 (PST) Received: from ack.Berkeley.EDU (ack.Berkeley.EDU [128.32.206.66]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1G0Dhj12647 for ; Thu, 15 Feb 2001 16:13:43 -0800 (PST) Received: (from lindahl@localhost) by ack.Berkeley.EDU (8.9.3+Sun/8.9.3) id QAA28942; Thu, 15 Feb 2001 16:00:24 -0800 (PST) Date: Thu, 15 Feb 2001 16:00:24 -0800 (PST) From: ken lindahl Message-Id: <200102160000.QAA28942@ack.Berkeley.EDU> To: dino@procket.com Subject: Re: Using DNS for SSM Cc: jschoch@sprint.net, ssm-interest@external.cisco.com On Thu, 15 Feb 2001, Dino Farinacci wrote: > However, I was thinking that potential source mirroring would be used so > > radio.example.com AA 10.1.1.1.232.1.1.1 > radio.example.com AA 10.2.2.2.232.1.1.1 > radio.west.example.com A 10.1.1.1 > radio.east.example.com A 10.2.2.2 > > might make sense and the members of the mirror would use consistent > group addresses for the same content. wouldn't this: radio.example.com A 232.1.1.1 radio.example.com A 10.1.1.1 radio.example.com A 10.2.2.2 accomplish the same thing? if you want to give the receiver a chance to go to the "nearest" server, i think you need to provide more information, anyway. thanks, ken From owner-extdom.ssm-interest@rtp-msg-core-1.cisco.com Thu Feb 15 20:58:17 2001 Received: from rtp-msg-core-1.cisco.com (rtp-msg-core-1.cisco.com [161.44.11.97]) by ietf.org (8.9.1a/8.9.1a) with SMTP id UAA04080 for ; Thu, 15 Feb 2001 20:58:16 -0500 (EST) Received: from cisco.com (omega.cisco.com [171.69.26.42]) by rtp-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id TAA19824 for ; Thu, 15 Feb 2001 19:25:36 -0500 (EST) Received: (from eckert@localhost) by cisco.com (8.8.8-Cisco List Logging/8.8.8) id QAA14107; Thu, 15 Feb 2001 16:25:56 -0800 (PST) From: Toerless Eckert Message-Id: <200102160025.QAA14107@cisco.com> Subject: Re: Using DNS for SSM To: dino@procket.com (Dino Farinacci) Date: Thu, 15 Feb 2001 16:25:56 -0800 (PST) Cc: eckert@cisco.com, lindahl@ack.berkeley.edu, jschoch@sprint.net, ssm-interest@external.cisco.com In-Reply-To: <200102160011.QAA14008@dino-pc.procket.com> from "Dino Farinacci" at Feb 15, 2001 04:11:36 PM X-Mailer: ELM [version 2.5 PL1] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit > >> Can someone explain to me what the urgent need for SSM specific > >> channel addresses is ? I agree that it is a nice-to-have, > > I don't see any urgency. What gave you that idea? Just all these mails ;-)) > >> channel addresses is ? I agree that it is a nice-to-have, > >> but such a mapping alone does not allow a user who wants > >> to receive a channel to simply type the address and then receive > >> the content. > > Sure it does. Just like most apps, you can type a DNS name or an address. > The Schoch proposal is not forcing apps to use this. > > Toerless, are you proposing SDP attributes in a DNS record. ;-) > I really haven't followed track on all the RR's being available, there are just too many of them. Isn't there a RR mapping from a DNS record to a URL and application-type of that URL ? fashion.tv IN URL http:/fashion.tv/session.sdp application/x-sdp A receiver application if presented with something like a domain name could look it up, and if has such a URL RR with application type x-sdp, then it would get the sdp file.via the URL given. And if you have a (S,G) channel with S=1.2.3.4, G=5.6.7.8, then you could do something along the lines of: 5.6.7.8.ipv4channel.4.3.2.1 IN PTR fashion.tv Cheers Toerless From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 15 21:06:28 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id VAA04261 for ; Thu, 15 Feb 2001 21:06:28 -0500 (EST) Received: from cisco.com (omega.cisco.com [171.69.26.42]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id QAA21115 for ; Thu, 15 Feb 2001 16:27:27 -0800 (PST) Received: (from eckert@localhost) by cisco.com (8.8.8-Cisco List Logging/8.8.8) id QAA14196; Thu, 15 Feb 2001 16:27:02 -0800 (PST) From: Toerless Eckert Message-Id: <200102160027.QAA14196@cisco.com> Subject: Re: Using DNS for SSM To: eckert@omega.cisco.com (Toerless Eckert) Date: Thu, 15 Feb 2001 16:27:02 -0800 (PST) Cc: dino@procket.com (Dino Farinacci), eckert@cisco.com, lindahl@ack.berkeley.edu, jschoch@sprint.net, ssm-interest@external.cisco.com In-Reply-To: <200102160025.QAA14107@cisco.com> from "Toerless Eckert" at Feb 15, 2001 04:25:56 PM X-Mailer: ELM [version 2.5 PL1] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit > 5.6.7.8.ipv4channel.4.3.2.1 IN PTR fashion.tv Should be: 5.6.7.8.ipv4channel.4.3.2.1.in-addr.arpa. IN PTR fashion.tv From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Thu Feb 15 21:20:46 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id VAA04517 for ; Thu, 15 Feb 2001 21:20:45 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id QAA11012 for ; Thu, 15 Feb 2001 16:46:48 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1G0kiS24536 for ; Thu, 15 Feb 2001 16:46:44 -0800 (PST) Received: from ns.live.com (ns.live.com [208.184.148.162]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1G0kAw02232 for ; Thu, 15 Feb 2001 16:46:11 -0800 (PST) Received: (from rsf@localhost) by ns.live.com (8.9.3/8.9.3) id QAA91246; Thu, 15 Feb 2001 16:41:56 -0800 (PST) (envelope-from rsf) Message-Id: <4.3.1.1.20010215163434.00b661c0@localhost> X-Sender: rsf@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Thu, 15 Feb 2001 16:41:50 -0800 To: ssm-interest@external.cisco.com From: Ross Finlayson Subject: Re: Using DNS for SSM In-Reply-To: <200102160011.QAA14008@dino-pc.procket.com> References: <200102152358.PAA11155@cisco.com> <200102152358.PAA11155@cisco.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed At 04:11 PM 2/15/01, Dino Farinacci wrote: > >> Can someone explain to me what the urgent need for SSM specific > >> channel addresses is ? I agree that it is a nice-to-have, > > I don't see any urgency. What gave you that idea? My reading of Toerless's message was that he was questioning the "need" at least as much as the "urgency". As Toerless noted, knowing a SSM channel address (S,G) alone doesn't tell you much. In order to be able to usefully receive the session, you still need additional information telling you something about the properties of the session (what media, what port(s), what format(s), etc.). In other words, you need the SDP description. Since we already have ways of delivering SDP descriptions (e.g., using HTTP, returning the application/sdp MIME type), and already have a way of describing SSM sessions (S,G, and everything else) in SDP, then why do we need to be able to look up SSM (S,G)s using DNS? Ross. From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 15 21:21:47 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id VAA04549 for ; Thu, 15 Feb 2001 21:21:46 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id RAA28084 for ; Thu, 15 Feb 2001 17:15:35 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1G1FIK03108 for ; Thu, 15 Feb 2001 17:15:18 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1G1Eow13210 for ; Thu, 15 Feb 2001 17:14:50 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id RAA14192; Thu, 15 Feb 2001 17:13:49 -0800 Date: Thu, 15 Feb 2001 17:13:49 -0800 Message-Id: <200102160113.RAA14192@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: finlayson@live.com CC: ssm-interest@external.cisco.com In-reply-to: <4.3.1.1.20010215163434.00b661c0@localhost> (message from Ross Finlayson on Thu, 15 Feb 2001 16:41:50 -0800) Subject: Re: Using DNS for SSM References: <200102152358.PAA11155@cisco.com> <200102152358.PAA11155@cisco.com> <4.3.1.1.20010215163434.00b661c0@localhost> >> My reading of Toerless's message was that he was questioning the "need" at >> least as much as the "urgency". Here's a basic need which I think would make managing multicast networks one step easier: mtrace radio.example.com >> As Toerless noted, knowing a SSM channel address (S,G) alone doesn't tell >> you much. In order to be able to usefully receive the session, you still Right, so what's your point. Did you think the DNS was suppose to solve that? It's hard enough to remember source and group addresses when debugging problems in the network infrastructure without adding any more issues to the problem statement. Just the fact a network operator can ask over the phone, "what are you trying to get to and who are you?", and the answer is radio.example.com and customer.broken-dsl.com, would allow the netadmin to do: mtrace radio.example.com customer.broken-dsl.com would go a long way to isolating problems from the NOC. Dino From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Thu Feb 15 21:44:37 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id VAA05796 for ; Thu, 15 Feb 2001 21:44:37 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id RAA02998 for ; Thu, 15 Feb 2001 17:17:22 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1G1HI810792 for ; Thu, 15 Feb 2001 17:17:18 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1G1Gow14164 for ; Thu, 15 Feb 2001 17:16:50 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id RAA14200; Thu, 15 Feb 2001 17:15:47 -0800 Date: Thu, 15 Feb 2001 17:15:47 -0800 Message-Id: <200102160115.RAA14200@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: jhall@uu.net CC: lindahl@ack.berkeley.edu, jschoch@sprint.net, ssm-interest@external.cisco.com In-reply-to: (jhall@UU.NET) Subject: Re: Using DNS for SSM References: >> I think this is quite simply a HOrRId idea! It has been ever since it was >> proposed. Of course it is from someone who memorizes group addresses. ;-) Dino From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 15 21:45:41 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id VAA05837 for ; Thu, 15 Feb 2001 21:45:41 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id RAA06854 for ; Thu, 15 Feb 2001 17:05:00 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1G14ir03855 for ; Thu, 15 Feb 2001 17:04:44 -0800 (PST) Received: from cmr1.ash.ops.us.uu.net (cmr1.ash.ops.us.uu.net [198.5.241.39]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1G14ij02036 for ; Thu, 15 Feb 2001 17:04:44 -0800 (PST) Received: from neserve0.corp.us.uu.net by cmr1.ash.ops.us.uu.net with ESMTP (peer crosschecked as: neserve0.corp.us.uu.net [153.39.92.148]) id QQkcoa18922; Fri, 16 Feb 2001 01:03:41 GMT Received: by neserve0.corp.us.uu.net id QQkcoa27561; Thu, 15 Feb 2001 20:03:40 -0500 (EST) From: jhall@UU.NET (Jeremy Hall) Message-Id: Subject: Re: Using DNS for SSM In-Reply-To: <200102152335.PAA13876@dino-pc.procket.com> from Dino Farinacci at "Feb 15, 2001 03:35:38 pm" To: Dino Farinacci Date: Thu, 15 Feb 2001 20:03:40 -0500 (EST) CC: lindahl@ack.berkeley.edu, jschoch@sprint.net, ssm-interest@external.cisco.com X-Mailer: ELM [version 2.4ME+ PL60 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit I think this is quite simply a HOrRId idea! It has been ever since it was proposed. _J In the new year, Dino Farinacci wrote: > >> simpler still would be to simply have two A records: > >> radio.example.com A 10.1.1.1 > >> radio.example.com A 232.1.1.1 > >> and let the application determine which is source and which is group > >> based on the address range? (i'm prepared for someone to tell me that > >> there are resolvers out there that pass only on A record to the app.) > > Yes, this could work and if someone wanted the same source to send > tv content, you'd have: > > tv.example.com A 10.1.1.1 > tv.example.com A 232.1.1.2 > > and if this *only* existed: > > cartoons.example.com A 232.1.1.1 > movies.example.co m A 232.1.1.1 > > it would be ambiguous (and insufficient) to the application so it would > be ignored. > > However, I was thinking that potential source mirroring would be used so > > radio.example.com AA 10.1.1.1.232.1.1.1 > radio.example.com AA 10.2.2.2.232.1.1.1 > radio.west.example.com A 10.1.1.1 > radio.east.example.com A 10.2.2.2 > > might make sense and the members of the mirror would use consistent > group addresses for the same content. > > Dino > From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 15 21:53:41 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id VAA05940 for ; Thu, 15 Feb 2001 21:53:41 -0500 (EST) Received: from cisco.com (omega.cisco.com [171.69.26.42]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id RAA25047 for ; Thu, 15 Feb 2001 17:55:20 -0800 (PST) Received: (from eckert@localhost) by cisco.com (8.8.8-Cisco List Logging/8.8.8) id RAA22455; Thu, 15 Feb 2001 17:54:56 -0800 (PST) From: Toerless Eckert Message-Id: <200102160154.RAA22455@cisco.com> Subject: Re: Using DNS for SSM To: lindahl@ack.berkeley.edu (ken lindahl) Date: Thu, 15 Feb 2001 17:54:56 -0800 (PST) Cc: dino@procket.com, eckert@cisco.com, jschoch@sprint.net, lindahl@ack.berkeley.edu, ssm-interest@external.cisco.com In-Reply-To: <200102160120.RAA00439@ack.Berkeley.EDU> from "ken lindahl" at Feb 15, 2001 05:20:58 PM X-Mailer: ELM [version 2.5 PL1] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit > >I really haven't followed track on all the RR's being available, > >there are just too many of them. Isn't there a RR mapping from > >a DNS record to a URL and application-type of that URL ? > > > >fashion.tv IN URL http:/fashion.tv/session.sdp application/x-sdp > > that's new to me, but i haven't been following very carefully either. > does anyone know the RFC? My english strikes again: I just wanted to say it would be _nice_ if there was something like this, because that's what i think is needed. I wasn't going to imply that i think there is something like it. > >5.6.7.8.ipv4channel.4.3.2.1 IN PTR fashion.tv > > if there's a need to get domain.name from (S, G), then i like the simplicity > of this suggestion. Well, debugging of course, you see the (S,G) state in your network and now you want to complain about it, or know how to receive that stream... Cheers Toerless From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 15 22:19:06 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id WAA06398 for ; Thu, 15 Feb 2001 22:19:06 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id SAA17500 for ; Thu, 15 Feb 2001 18:11:07 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1G2Awv13698 for ; Thu, 15 Feb 2001 18:10:58 -0800 (PST) Received: from cmr1.ash.ops.us.uu.net (cmr1.ash.ops.us.uu.net [198.5.241.39]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1G2Amf20266 for ; Thu, 15 Feb 2001 18:10:48 -0800 (PST) Received: from neserve0.corp.us.uu.net by cmr1.ash.ops.us.uu.net with ESMTP (peer crosschecked as: neserve0.corp.us.uu.net [153.39.92.148]) id QQkcoe10776; Fri, 16 Feb 2001 02:09:48 GMT Received: by neserve0.corp.us.uu.net id QQkcoe07551; Thu, 15 Feb 2001 21:09:47 -0500 (EST) From: jhall@UU.NET (Jeremy Hall) Message-Id: Subject: Re: Using DNS for SSM In-Reply-To: <200102160115.RAA14200@dino-pc.procket.com> from Dino Farinacci at "Feb 15, 2001 05:15:47 pm" To: Dino Farinacci Date: Thu, 15 Feb 2001 21:09:47 -0500 (EST) CC: jhall@UU.NET, lindahl@ack.berkeley.edu, jschoch@sprint.net, ssm-interest@external.cisco.com X-Mailer: ELM [version 2.4ME+ PL60 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit only a couple, I don't remember what cisco multicast is. actually I don't remember hardly ANY except 224.2.186.225/26406 for KmGE hmm 224.2.173.150 looks familiar. _J In the new year, Dino Farinacci wrote: > >> I think this is quite simply a HOrRId idea! It has been ever since it was > >> proposed. > > Of course it is from someone who memorizes group addresses. ;-) > > Dino > From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 15 22:47:08 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id WAA07936 for ; Thu, 15 Feb 2001 22:47:08 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id RAA27076 for ; Thu, 15 Feb 2001 17:34:37 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1G1YMM19571 for ; Thu, 15 Feb 2001 17:34:22 -0800 (PST) Received: from ack.Berkeley.EDU (ack.Berkeley.EDU [128.32.206.66]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1G1YJf06441 for ; Thu, 15 Feb 2001 17:34:19 -0800 (PST) Received: (from lindahl@localhost) by ack.Berkeley.EDU (8.9.3+Sun/8.9.3) id RAA00439; Thu, 15 Feb 2001 17:20:58 -0800 (PST) Date: Thu, 15 Feb 2001 17:20:58 -0800 (PST) From: ken lindahl Message-Id: <200102160120.RAA00439@ack.Berkeley.EDU> To: dino@procket.com, eckert@cisco.com Subject: Re: Using DNS for SSM Cc: jschoch@sprint.net, lindahl@ack.Berkeley.EDU, ssm-interest@external.cisco.com On Thu, 15 Feb 2001, Toerless Eckert wrote: >Just all these mails ;-)) a sense of urgency was not intended. if getting (S, G) from dns is not terribly useful, then kill the draft that started this discussion. my point was only that if one has a desire to get (S, G) from dns, there are straightforward ways to accomplish that. >I really haven't followed track on all the RR's being available, >there are just too many of them. Isn't there a RR mapping from >a DNS record to a URL and application-type of that URL ? > >fashion.tv IN URL http:/fashion.tv/session.sdp application/x-sdp that's new to me, but i haven't been following very carefully either. does anyone know the RFC? >5.6.7.8.ipv4channel.4.3.2.1 IN PTR fashion.tv if there's a need to get domain.name from (S, G), then i like the simplicity of this suggestion. thanks, ken From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Fri Feb 16 04:33:27 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id EAA25374 for ; Fri, 16 Feb 2001 04:33:26 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id AAA28579 for ; Fri, 16 Feb 2001 00:13:02 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1G8CxH26992 for ; Fri, 16 Feb 2001 00:12:59 -0800 (PST) Received: from bells.cs.ucl.ac.uk (bells.cs.ucl.ac.uk [128.16.5.31]) by proxy2.cisco.com (8.11.2/8.11.2) with SMTP id f1G8CVw25979 for ; Fri, 16 Feb 2001 00:12:31 -0800 (PST) Received: from hocus.cs.ucl.ac.uk by bells.cs.ucl.ac.uk with local SMTP id ; Fri, 16 Feb 2001 08:07:37 +0000 To: jhall@uu.net (Jeremy Hall) cc: Dino Farinacci , lindahl@ack.berkeley.edu, jschoch@sprint.net, ssm-interest@external.cisco.com Subject: Re: Using DNS for SSM In-reply-to: Your message of "Thu, 15 Feb 2001 21:09:47 EST." Date: Fri, 16 Feb 2001 08:07:36 +0000 Message-ID: <14473.982310856@cs.ucl.ac.uk> From: Jon Crowcroft 224.5.17.11 was always one of my faves... anyhow dino's idea is kinda better than my v6 one:-) In message , Jeremy Hall type d: >>only a couple, I don't remember what cisco multicast is. actually I don't >>remember hardly ANY except 224.2.186.225/26406 for KmGE >> >>hmm 224.2.173.150 looks familiar. >>_J >> >>In the new year, Dino Farinacci wrote: >>> >> I think this is quite simply a HOrRId idea! It has been ever since it was >>> >> proposed. >>> >>> Of course it is from someone who memorizes group addresses. ;-) >>> >>> Dino >>> >> cheers jon From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Fri Feb 16 04:34:47 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id EAA25405 for ; Fri, 16 Feb 2001 04:34:47 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id AAA24704 for ; Fri, 16 Feb 2001 00:24:00 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1G8NpZ04259 for ; Fri, 16 Feb 2001 00:23:51 -0800 (PST) Received: from p-mail2.cnet.fr (p-mail2.rd.francetelecom.fr [193.49.124.32]) by proxy3.cisco.com (8.11.2/8.11.2) with SMTP id f1G8Njj16583 for ; Fri, 16 Feb 2001 00:23:45 -0800 (PST) Received: by p-voyageur.rd.francetelecom.fr with Internet Mail Service (5.5.2653.19) id <1PGF70MQ>; Fri, 16 Feb 2001 09:20:18 +0100 Message-ID: From: SENECLAUZE Gregoire FTRD/DAC/LAN To: "'ssm-interest@external.cisco.com'" Date: Fri, 16 Feb 2001 09:18:18 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="ISO-8859-1" unsubscribe ssm-interest gregoire.seneclauze@francetelecom.fr unsubscribe ssm-interest gregoire.seneclauze@cnet.francetelecom.fr unsubscribe ssm-interest gregoire.seneclauze@rd.francetelecom.fr From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Fri Feb 16 05:49:39 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id FAA25994 for ; Fri, 16 Feb 2001 05:49:38 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id BAA28195 for ; Fri, 16 Feb 2001 01:44:38 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1G9iYA14402 for ; Fri, 16 Feb 2001 01:44:34 -0800 (PST) Received: from accord-soft.com ([164.164.69.252]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1G9iWj07905 for ; Fri, 16 Feb 2001 01:44:33 -0800 (PST) Received: from accord-soft.com (Lokesh [192.168.1.27]) by accord-soft.com (8.9.3/8.9.3) with ESMTP id PAA06112 for ; Fri, 16 Feb 2001 15:11:38 +0530 Message-ID: <3A8CF4E6.E277CB02@accord-soft.com> Date: Fri, 16 Feb 2001 15:07:42 +0530 From: loki X-Mailer: Mozilla 4.7 [en] (Win95; I) X-Accept-Language: en MIME-Version: 1.0 To: ssm-interest@external.cisco.com Subject: Unsubscribe Content-Type: text/plain; charset=EUC-KR Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit unsubscribe ssm-interest loki@accord-soft.com From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Fri Feb 16 09:21:08 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id JAA29673 for ; Fri, 16 Feb 2001 09:21:08 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id EAA13226 for ; Fri, 16 Feb 2001 04:49:27 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1GCnCC03079 for ; Fri, 16 Feb 2001 04:49:12 -0800 (PST) Received: from davis.bandwiz.com ([212.150.220.34]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1GCnBj21626 for ; Fri, 16 Feb 2001 04:49:12 -0800 (PST) Received: by davis.bandwiz.com with Internet Mail Service (5.5.2653.19) id <167M4QVP>; Fri, 16 Feb 2001 14:45:53 +0200 Message-ID: <288F58308EFBD411B896006008F5DCAA3CE0@davis.bandwiz.com> From: Doron Rajwan To: Hitoshi Asaeda Cc: ssm-interest@external.cisco.com Subject: RE: multicast-transition (fwd) Date: Fri, 16 Feb 2001 14:45:48 +0200 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Hitoshi, The protocol you are suggesting is a totally new multicast protocol. It is self-contained, i.e., does not need different join/leave protocol, and can automatically create tunnels. This protocol uses the "8-byte" notation, i.e., (S,G). There was another protocol, with these specifications, called Simple Multicast. From various reasons it didn't pass the IETF. At this point, I would say, there is no need for another multicast protocol. We have PIM-SSM / IGMPv3, which I think is ready, partially deployed, and will scale well to the entire Internet. We should, however, fix some problems: tunneling, reverse-IGMP, and most important -- deploy it, and use it. For the protocol itself, I think that it has a severe security bug: the forward tree setup. Other multicast protocols uses the (sub-optimal) reverse tree setup. With forward tree setup, there can be an attack from the multicast transmitter; it can send join packets to everyone in the Internet, and cause a flood. Any forward tree setup is subject to this attack. These protocols will work only if you PAY per receiver; in this case, I am not sure that we need multicast at all. Doron. -----Original Message----- From: Hitoshi Asaeda [mailto:asaeda@yamato.ibm.com] Sent: Friday, February 09, 2001 2:07 PM To: ssm-interest@external.cisco.com Cc: asaeda@yamato.ibm.com Subject: RE: multicast-transition (fwd) It must be too early to tell my detail design, though. I've been doing my research around this topic, to implement SSM very easily. My idea just uses modified IGMP and may not require multicast routing protocol. Protocol changes are; o. Modified IGMP defines new three IGMP types, IGMP Reply, IGMP Ack, and IGMP Data. o. Modified IGMP can be sent as a unicast packet. e.g., as for receiver's join, followings are basic deals; o. Receiver just sends IGMP Report(Join) to an interesting sender by unicast. o. Sender tries to send IGMP Reply back toward the receiver after receiving IGMP Report(Join). o. A new-IGMP-capable-intermediate router located between sender and receiver steals this IGMP Reply and sends IGMP Ack back to the source address of the Reply packet. o. Above intermediate router creates (S,G) state which consists of iif, oif list, and destination list. (oif is given by unicast routing table, or MRIB if you want to use additional multicast routing protocol.) o. Above intermediate router sends IGMP Reply toward the receiver continuously. o. After sender receives IGMP Ack, he sends IGMP Data which encapsulates IGMP header and UDP data to Ack sender. o. Destination address of IGMP Data can be changed according to the next destination (i.e. neighbor node to forward Data). The destination is Ack sender if the neighbor is not on a same LAN, and it is G if the neighbor is on a same LAN. o. ... My proposal has several important points. 1. It doesn't require any multicast routing protocol. Only supporting new IGMP by sender and receiver is required. 2. If there is no intermediate router which supports new IGMP within a sender and receiver path, it looks like sender sends unicast packet whose protocol type (ip->ip_p) is IGMP (#2). So, it must be so easy to deploy. 3. Because only unicast route is used and data path is created from the sender toward each receiver, it is very scalable and bi-directional. 4. Not so difficult to implement. (I believe so.) 5. It is easy to implement on IPv6, too. (Specific needs.) 6. It doesn't require some tunneling mechanism. It requires simple encapsulation technique. (You may say I use tunneling but I don't like to say "tunnel", because, to me, tunnel just gives an image to make some stateful or keep track of the connection, anyway.:) Of course, there are some immature/unsolved points. 1. Interoperability between current multicast routing protocol. 2. Scalable timer management. 3. Security.:) ... and so on. Any comments, even objection, would be welcome. -- Hitoshi Asaeda From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Fri Feb 16 23:01:06 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id XAA16112 for ; Fri, 16 Feb 2001 23:01:05 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id SAA12110 for ; Fri, 16 Feb 2001 18:54:16 -0800 (PST) From: hrandolf@itio.net Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1H2sKF24294 for ; Fri, 16 Feb 2001 18:54:20 -0800 (PST) Received: from mailer1.mail.com (HSE-Ottawa-ppp157596.sympatico.ca [64.229.131.13]) by proxy3.cisco.com (8.11.2/8.11.2) with SMTP id f1H2s8M26003 for ; Fri, 16 Feb 2001 18:54:09 -0800 (PST) To: Date: Fri, 16 Feb 2001 18:18:17 Message-Id: <663.492678.440478@mailer1.mail.com> Subject: Its Your Turn... 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From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Sun Feb 18 21:17:09 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id VAA13119 for ; Sun, 18 Feb 2001 21:17:09 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id RAA08256 for ; Sun, 18 Feb 2001 17:26:32 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1J1Qad28093 for ; Sun, 18 Feb 2001 17:26:36 -0800 (PST) Received: from missouri.yamato.ibm.com (missouri.yamato.ibm.com [203.141.89.179]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1J1QS223967 for ; Sun, 18 Feb 2001 17:26:29 -0800 (PST) Received: from kyoto.yamato.ibm.com (kyoto.yamato.ibm.com [9.68.27.152]) by missouri.yamato.ibm.com (8.11.2/8.11.2) with ESMTP id f1J1L9x12972; Mon, 19 Feb 2001 10:21:09 +0900 Received: from localhost (ymtlogin1.yamato.ibm.com [9.68.80.207]) by kyoto.yamato.ibm.com (8.11.1/3.7W) with ESMTP id f1J1L8S115026; Mon, 19 Feb 2001 10:21:08 +0900 To: Doron@bandwiz.com Cc: ssm-interest@external.cisco.com Subject: RE: multicast-transition (fwd) In-Reply-To: Your message of "Fri, 16 Feb 2001 14:45:48 +0200" <288F58308EFBD411B896006008F5DCAA3CE0@davis.bandwiz.com> References: <288F58308EFBD411B896006008F5DCAA3CE0@davis.bandwiz.com> X-Mailer: Mew version 1.93 on Emacs 19.28 / Mule 2.3 (SUETSUMUHANA) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: <20010219102108S.asaeda@yamato.ibm.com> Date: Mon, 19 Feb 2001 10:21:08 +0900 (JST) From: Hitoshi Asaeda X-Dispatcher: imput version 980905(IM100) Lines: 53 Content-Transfer-Encoding: 7bit Doron, Thank you for reply. > The protocol you are suggesting is a totally new multicast protocol. It is > self-contained, i.e., does not need different join/leave protocol, and can > automatically create tunnels. This protocol uses the "8-byte" notation, > i.e., (S,G). It may be seen it's a new. And your guess seems right. But even you feel it's new, it'd be good for us if it'll be deployed, wouldn't it? > There was another protocol, with these specifications, called Simple > Multicast. From various reasons it didn't pass the IETF. At this point, I I'm not familier with the spec of Simple Multicast, but I know it. If my idea is similar to Simple Multicast, that should be called "Simple Multicast-SSM"? :) Anyway, I'll check the detail spec. > would say, there is no need for another multicast protocol. We have PIM-SSM > / IGMPv3, which I think is ready, partially deployed, and will scale well to partially deployed, yes. scale well is yes? To scale well, MSDP was proposed, as you know, even MSDP itself may not be scalable. But, we should not start PIM/MSDP's scalability issue here. > the entire Internet. We should, however, fix some problems: tunneling, > reverse-IGMP, and most important -- deploy it, and use it. Totally agree. > For the protocol itself, I think that it has a severe security bug: the > forward tree setup. Other multicast protocols uses the (sub-optimal) reverse > tree setup. With forward tree setup, there can be an attack from the > multicast transmitter; it can send join packets to everyone in the Internet, > and cause a flood. Any forward tree setup is subject to this attack. These Yes, that's right. So, I wrote "there are some immature/unsolved points, and one is security.". > protocols will work only if you PAY per receiver; in this case, I am not > sure that we need multicast at all. I don't make an objection for your idea and my idea, mine is not finished. But, I for one wish multicast is easiliy deployed step by step. Thank you. -- Hitoshi Asaeda From owner-extdom.ssm-interest@rtp-msg-core-1.cisco.com Wed Feb 21 12:04:51 2001 Received: from rtp-msg-core-1.cisco.com (rtp-msg-core-1.cisco.com [161.44.11.97]) by ietf.org (8.9.1a/8.9.1a) with SMTP id MAA02922 for ; Wed, 21 Feb 2001 12:04:51 -0500 (EST) Received: from mail1.cisco.com (mail1.cisco.com [171.68.225.60]) by rtp-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id KAA12196 for ; Wed, 21 Feb 2001 10:35:57 -0500 (EST) Received: from bwilliam-8000.cisco.com (bwilliam-isdn1.cisco.com [171.70.247.82]) by mail1.cisco.com (8.8.6 (PHNE_14041)/CISCO.SERVER.1.2) with ESMTP id HAA14059; Wed, 21 Feb 2001 07:35:51 -0800 (PST) Message-Id: <4.3.2.7.2.20010221093231.027826d0@mail1.cisco.com> X-Sender: bwilliam@mail1.cisco.com X-Mailer: QUALCOMM Windows Eudora Version 4.3.2 Date: Wed, 21 Feb 2001 09:33:34 -0800 To: Dino Farinacci , finlayson@live.com From: Beau Williamson Subject: Re: Using DNS for SSM Cc: ssm-interest@external.cisco.com In-Reply-To: <200102160113.RAA14192@dino-pc.procket.com> References: <4.3.1.1.20010215163434.00b661c0@localhost> <200102152358.PAA11155@cisco.com> <200102152358.PAA11155@cisco.com> <4.3.1.1.20010215163434.00b661c0@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" At 05:13 PM 2/15/2001, Dino Farinacci wrote: >>> My reading of Toerless's message was that he was questioning the "need" at >>> least as much as the "urgency". > > Here's a basic need which I think would make managing multicast networks > one step easier: > > mtrace radio.example.com > >>> As Toerless noted, knowing a SSM channel address (S,G) alone doesn't tell >>> you much. In order to be able to usefully receive the session, you still > > Right, so what's your point. Did you think the DNS was suppose to solve > that? > > It's hard enough to remember source and group addresses when debugging > problems in the network infrastructure without adding any more issues > to the problem statement. > > Just the fact a network operator can ask over the phone, "what are you > trying to get to and who are you?", and the answer is radio.example.com and > customer.broken-dsl.com, would allow the netadmin to do: > > mtrace radio.example.com customer.broken-dsl.com > > would go a long way to isolating problems from the NOC. Boy, this sort of thing would have come in handy in the past. This has merit. Beau Williamson From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Wed Feb 21 17:14:12 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id RAA12323 for ; Wed, 21 Feb 2001 17:14:11 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id MAA06429 for ; Wed, 21 Feb 2001 12:58:04 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1LKw7p14489 for ; Wed, 21 Feb 2001 12:58:08 -0800 (PST) Received: from nexpdc.ns.dacom.co.kr ([210.182.73.226]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1LKvIj26293 for ; Wed, 21 Feb 2001 12:57:19 -0800 (PST) Message-Id: <200102212057.f1LKvIj26293@proxy2.cisco.com> Received: from host (ip91.providence11.ri.pub-ip.psi.net [38.26.242.91]) by nexpdc.ns.dacom.co.kr with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2653.13) id 1CL8KW8W; Thu, 22 Feb 2001 05:53:37 +0900 From: "Ken Hinis" Subject: All Cards #58EC To: jump38d@cisco.com X-Mailer: Microsoft Outlook Express 4.72.1712.3 X-MimeOLE: Produced By Microsoft MimeOLE VÐßD.1712.3 Mime-Version: 1.0 Date: Wed, 21 Feb 2001 11:18:43 -0500 Content-Type: multipart/mixed; boundary="----=_NextPart_000_007F_01BDF6C7.FABAC1B0" This is a MIME Message ------=_NextPart_000_007F_01BDF6C7.FABAC1B0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0080_01BDF6C7.FABAC1B0" ------=_NextPart_001_0080_01BDF6C7.FABAC1B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ***** This is an HTML Message ! ***** ------=_NextPart_001_0080_01BDF6C7.FABAC1B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable FREE Computer With Merchant Account Setup

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Click Here ------=_NextPart_001_0080_01BDF6C7.FABAC1B0-- ------=_NextPart_000_007F_01BDF6C7.FABAC1B0-- From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Wed Feb 21 18:16:47 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id SAA13652 for ; Wed, 21 Feb 2001 18:16:45 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id NAA13538 for ; Wed, 21 Feb 2001 13:56:30 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1LLuDx11969 for ; Wed, 21 Feb 2001 13:56:13 -0800 (PST) Received: from multicasttech.com (IDENT:root@garcia.multicasttech.com [63.105.122.8]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1LLu9W17054 for ; Wed, 21 Feb 2001 13:56:09 -0800 (PST) Received: from [63.105.122.193] (HELO 21rst-century.com) by multicasttech.com (CommuniGate Pro SMTP 3.3.2) with ESMTP id 800284; Wed, 21 Feb 2001 16:38:02 -0500 Message-ID: <3A943427.BA9BCE1A@21rst-century.com> Date: Wed, 21 Feb 2001 16:33:27 -0500 From: Marshall Eubanks Reply-To: tme@21rst-century.com X-Mailer: Mozilla 4.7C-CCK-MCD {C-UDP; EBM-APPLE} (Macintosh; I; PPC) X-Accept-Language: en,pdf MIME-Version: 1.0 To: SSM Interest , mbone mail list , "Randy K. Freedman" , tech team , Steve Wainstead , Vinay Anand Subject: SSM / DOS presentation Content-Type: text/plain; charset=us-ascii; x-mac-type="54455854"; x-mac-creator="4D4F5353" Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit For interested parties, copies of my NANOG SSM / Multicast DOS presentation are available from http://www.nanog.org/mtg-0102/eubanks.html Complaints, comments, questions, etc., are welcomed as always and should be directed to me. Anyone interested may use these viewgraphs in their presentations, as long as proper credit is given. Regards Marshall Eubanks T.M. Eubanks Multicast Technologies, Inc 10301 Democracy Lane, Suite 410 Fairfax, Virginia 22030 Phone : 703-293-9624 Fax : 703-293-9609 e-mail : tme@on-the-i.com tme@multicasttech.com http://www.on-the-i.com http://www.buzzwaves.com From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Wed Feb 21 18:16:54 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id SAA13662 for ; Wed, 21 Feb 2001 18:16:54 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id OAA25343 for ; Wed, 21 Feb 2001 14:28:00 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1LMS4A18700 for ; Wed, 21 Feb 2001 14:28:04 -0800 (PST) Received: from tabby.sonn.com (tabby.sonn.com [206.79.239.6]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1LMRrW10490 for ; Wed, 21 Feb 2001 14:27:53 -0800 (PST) Received: (from eve@localhost) by tabby.sonn.com (8.9.3/8.9.3) id OAA41610 for ssm-interest@external.cisco.com; Wed, 21 Feb 2001 14:26:32 -0800 (PST) Date: Wed, 21 Feb 2001 14:26:32 -0800 From: Eve Koenning To: ssm-interest@external.cisco.com Message-ID: <20010221142632.H18044@sonn.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.4i subscribe ssm-interest From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Wed Feb 21 19:31:54 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id TAA14903 for ; Wed, 21 Feb 2001 19:31:53 -0500 (EST) Received: from holbrook-laptop.cisco.com (holbrook-dsl1.cisco.com [10.19.148.186]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id PAA27144; Wed, 21 Feb 2001 15:28:27 -0800 (PST) Received: by holbrook-laptop.cisco.com (Postfix, from userid 500) id 18054C3C5B; Wed, 21 Feb 2001 15:28:18 -0800 (PST) From: Hugh Holbrook To: Beau Williamson Cc: Dino Farinacci , finlayson@live.com, ssm-interest@external.cisco.com In-reply-to: <4.3.2.7.2.20010221093231.027826d0@mail1.cisco.com> Subject: Re: Re: Using DNS for SSM Reply-To: holbrook@cisco.com Mime-Version: 1.0 (generated by tm-edit 1.7) Content-Type: text/plain; charset=US-ASCII Message-Id: <20010221232818.18054C3C5B@holbrook-laptop.cisco.com> Date: Wed, 21 Feb 2001 15:28:18 -0800 (PST) > Just the fact a network operator can ask over the phone, "what are you > trying to get to and who are you?", and the answer is radio.example.com and > customer.broken-dsl.com, would allow the netadmin to do: > > mtrace radio.example.com customer.broken-dsl.com > > would go a long way to isolating problems from the NOC. I can see that it would be nice to be able to mtrace using DNS name(s) for SSM content rather than a bunch of random numbers. So I'm trying to imagine how all of this fits together. How does the customer get the SSM DNS name so that it can tell the NOC? Would the DNS name be stored in the SDP record? Or is the idea that the application does a reverse lookup on the address pair in the SDP record? Or does this information come from somewhere else? I'm not sure it's really necessary to have channels represented as first-class objects in the DNS, though. I think it would be nice if we could get the benefits of simple channel names without requiring a new RR and associated upgrade to bind. Here's an idea that relies on a naming convention for channels that achieves the same purpose, at least for mtrace. A simple change to mtrace would support the exact syntax that you suggest without requiring any DNS changes at all. So you invoke mtrace like this mtrace kqed.radio.example.com customer.broken-dsl.com The first thing that mtrace does is to resolve kqed.radio.example.com and get back an A record that says that kqed.radio.example.com maps to 232.1.2.3. mtrace knows this is an SSM destination address and then strips off the component of the DNS name (kqed) to find the DNS name of the source, radio.example.com which it then resolves to get the source address. I just wrote a perl script in about ten minutes that does this. If a content provider doesn't want to have a four-component name for all of its SSM content, then it can use a PTR record to make kqed.example.com be an alias for kqed.radio.example.com. Given this, I'm not seeing a strong case for having a new RR. Thoughts? -Hugh > Date: Wed, 21 Feb 2001 09:33:34 -0800 > From: Beau Williamson > Cc: ssm-interest@external.cisco.com > > At 05:13 PM 2/15/2001, Dino Farinacci wrote: > >>> My reading of Toerless's message was that he was questioning the "need" at > >>> least as much as the "urgency". > > > > Here's a basic need which I think would make managing multicast networks > > one step easier: > > > > mtrace radio.example.com > > > >>> As Toerless noted, knowing a SSM channel address (S,G) alone doesn't tell > >>> you much. In order to be able to usefully receive the session, you still > > > > Right, so what's your point. Did you think the DNS was suppose to solve > > that? > > > > It's hard enough to remember source and group addresses when debugging > > problems in the network infrastructure without adding any more issues > > to the problem statement. > > > > Just the fact a network operator can ask over the phone, "what are you > > trying to get to and who are you?", and the answer is radio.example.com and > > customer.broken-dsl.com, would allow the netadmin to do: > > > > mtrace radio.example.com customer.broken-dsl.com > > > > would go a long way to isolating problems from the NOC. > > Boy, this sort of thing would have come in handy in the past. This has merit. > > Beau Williamson > > From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Wed Feb 21 20:18:58 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id UAA15614 for ; Wed, 21 Feb 2001 20:18:57 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id PAA28878 for ; Wed, 21 Feb 2001 15:52:14 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1LNqIr03757 for ; Wed, 21 Feb 2001 15:52:18 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1LNq7W29750 for ; Wed, 21 Feb 2001 15:52:07 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id PAA15458; Wed, 21 Feb 2001 15:51:32 -0800 Date: Wed, 21 Feb 2001 15:51:32 -0800 Message-Id: <200102212351.PAA15458@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: holbrook@cisco.com CC: bwilliam@cisco.com, finlayson@live.com, ssm-interest@external.cisco.com In-reply-to: <20010221232818.18054C3C5B@holbrook-laptop.cisco.com> (message from Hugh Holbrook on Wed, 21 Feb 2001 15:28:18 -0800 (PST)) Subject: Re: Using DNS for SSM References: <20010221232818.18054C3C5B@holbrook-laptop.cisco.com> >> So I'm trying to imagine how all of this fits together. How does the >> customer get the SSM DNS name so that it can tell the NOC? Would the They move their cursor over the URL in their browser. >> So you invoke mtrace like this >> >> mtrace kqed.radio.example.com customer.broken-dsl.com >> >> The first thing that mtrace does is to resolve kqed.radio.example.com >> and get back an A record that says that kqed.radio.example.com maps to >> 232.1.2.3. mtrace knows this is an SSM destination address and then >> strips off the component of the DNS name (kqed) to find the DNS name >> of the source, radio.example.com which it then resolves to get the >> source address. I just wrote a perl script in about ten minutes that >> does this. We've been doing this for years already! But with SSM the group address is local to the source and is only significant to the source. Dino From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Wed Feb 21 22:57:19 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id WAA19752 for ; Wed, 21 Feb 2001 22:57:18 -0500 (EST) Received: from holbrook-laptop.cisco.com (holbrook-dsl1.cisco.com [10.19.148.186]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id SAA12715; Wed, 21 Feb 2001 18:44:42 -0800 (PST) Received: by holbrook-laptop.cisco.com (Postfix, from userid 500) id 49E5BC3C5B; Wed, 21 Feb 2001 18:44:35 -0800 (PST) From: Hugh Holbrook To: Dino Farinacci Cc: holbrook@cisco.com, bwilliam@cisco.com, finlayson@live.com, ssm-interest@external.cisco.com In-reply-to: <200102212351.PAA15458@dino-pc.procket.com> Subject: Re: Re: Using DNS for SSM Reply-To: holbrook@cisco.com Mime-Version: 1.0 (generated by tm-edit 1.7) Content-Type: text/plain; charset=US-ASCII Message-Id: <20010222024435.49E5BC3C5B@holbrook-laptop.cisco.com> Date: Wed, 21 Feb 2001 18:44:35 -0800 (PST) > >> So I'm trying to imagine how all of this fits together. How does the > >> customer get the SSM DNS name so that it can tell the NOC? Would the > > They move their cursor over the URL in their browser. I'm not sure I get it. Where in the URL would the SSM DNS name appear? Are you suggesting that kqed.radio.example.com resolves to *both* the unicast address of a web server that is serving up an sdp record *and* to the AA record, in which case we have a URL like this: http://kqed.radio.example.com/multicast-sessions/someSdpRecord.sdp And a zone file something like this? kqed.radio.example.com CNAME radio.example.com kqed.radio.example.com AA 232.1.2.3.172.20.59.67 Or is the idea that browsers would understand AA records, or something else? -Hugh From owner-extdom.ssm-interest@rtp-msg-core-1.cisco.com Wed Feb 21 23:28:21 2001 Received: from rtp-msg-core-1.cisco.com (rtp-msg-core-1.cisco.com [161.44.11.97]) by ietf.org (8.9.1a/8.9.1a) with SMTP id XAA19937 for ; Wed, 21 Feb 2001 23:28:20 -0500 (EST) Received: from cisco.com (omega.cisco.com [171.69.26.42]) by rtp-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id WAA27129 for ; Wed, 21 Feb 2001 22:29:32 -0500 (EST) Received: (from eckert@localhost) by cisco.com (8.8.8-Cisco List Logging/8.8.8) id TAA13048; Wed, 21 Feb 2001 19:29:56 -0800 (PST) Date: Wed, 21 Feb 2001 19:29:56 -0800 From: Toerless Eckert To: Marshall Eubanks Cc: SSM Interest , mbone mail list , "Randy K. Freedman" , tech team , Steve Wainstead , Vinay Anand Subject: Re: SSM / DOS presentation Message-ID: <20010221192956.B1600@omega.cisco.com> References: <3A943427.BA9BCE1A@21rst-century.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <3A943427.BA9BCE1A@21rst-century.com>; from tme@21rst-century.com on Wed, Feb 21, 2001 at 04:33:27PM -0500 On Wed, Feb 21, 2001 at 04:33:27PM -0500, Marshall Eubanks wrote: > http://www.nanog.org/mtg-0102/eubanks.html > > Complaints, comments, questions, etc., are welcomed as always and should be directed to me. Excellent presentation, Marhsall. Some comments: a) You write that "SSM is a subset of PIM-SM..." Albeit we at Cisco are the first that would state that PIM-SSM is the ideal solution to provide SSM services, i wouldn't make the above statement. PIM-SSM is just one way how to get SSM. SSM in itself is a service mode. I like to say that there's IP Multicast which covers two delivery modes: ASM (previously called ISM), in which receivers will get traffic as soon as they indicate their desire to join a group (they may use IGMPv3 source filtering to restritct that traffic though), and SSM, in which receiver MUST signal (S,G) membership or he doesn't get traffic. SSM is not about however the routers manage to forward traffic amongst each other. For example, a subset of IGMPv3-proxy-routing could also deliver SSM service. Which actually would make good sense for low end edge-routers. Or one could think about extending MOSPF to support SSM (*yuck* ;-). PIM-Dense-Mode would almost fit SSM, except that the architecture draft mandates an "explicit-join" model to cash in on DoS prevention. b) In one place you write: "Interior routersneed to filter ... for (*,G) joins", in another place you write "No RP". I think those two statements are a bit confusing, because they relate to wether or not the router understands PIM-SSM. If it does understand PIM-SSM, then yes, there's no need to configure an RP on it, but there's alo no need to "filter (*,G) joins", they are just undefined in PIM-SSM and are ignored - like any other undefined message. Now on legacy PIM-SM routers, where you want to configure a group range so that it will pass through SSM traffic, yes, you may want to filter (*,G) joins, but then again, you also need to define an (imaginary) RP, so that the group in in sparse-mode. If there is no RP configured, then the group would be dense-mode and not forward the explicit (S,G) joins. We thought that it would be difficult to upgrade all of the ISPs core to a SSM enabled IOS versions, which is why we put much value in the facts on how to configure legacy routers, but then came the ramen worm... ;-)) c) The SSM advantage of "No RP" is actually far larger: No difficult choice between AutoRP, BSR, Static-RP configuration or Anycast-RP with MSDP, no configuring of redundant RPs... d) Whistler is called "Windows XP" now ;-)). e) As far as the rate-limits of all kind of messages are concerned, i don't think rate-limits buy us enough. We need overall state limitation, which is for example what our fix in 12.0(15)S does for MSDP. Cheers Toerless From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Wed Feb 21 23:47:33 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id XAA20516 for ; Wed, 21 Feb 2001 23:47:32 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id TAA11865 for ; Wed, 21 Feb 2001 19:54:19 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1M3s2k19558 for ; Wed, 21 Feb 2001 19:54:02 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1M3s3b26941 for ; Wed, 21 Feb 2001 19:54:03 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id TAA16358; Wed, 21 Feb 2001 19:54:39 -0800 Date: Wed, 21 Feb 2001 19:54:39 -0800 Message-Id: <200102220354.TAA16358@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: holbrook@cisco.com CC: holbrook@cisco.com, bwilliam@cisco.com, finlayson@live.com, ssm-interest@external.cisco.com In-reply-to: <20010222024435.49E5BC3C5B@holbrook-laptop.cisco.com> (message from Hugh Holbrook on Wed, 21 Feb 2001 18:44:35 -0800 (PST)) Subject: Re: Using DNS for SSM References: <20010222024435.49E5BC3C5B@holbrook-laptop.cisco.com> >> I'm not sure I get it. Where in the URL would the SSM DNS name >> appear? Are you suggesting that kqed.radio.example.com resolves to >> *both* the unicast address of a web server that is serving up an sdp >> record *and* to the AA record, in which case we have a URL like this: The link can be the AA record. Dino From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 22 05:27:21 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id FAA06804 for ; Thu, 22 Feb 2001 05:27:21 -0500 (EST) Received: from cisco.com (omega.cisco.com [171.69.26.42]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id BAA07859 for ; Thu, 22 Feb 2001 01:14:31 -0800 (PST) Received: (from eckert@localhost) by cisco.com (8.8.8-Cisco List Logging/8.8.8) id BAA00765; Thu, 22 Feb 2001 01:13:36 -0800 (PST) Date: Thu, 22 Feb 2001 01:13:35 -0800 From: Toerless Eckert To: Dino Farinacci Cc: holbrook@cisco.com, bwilliam@cisco.com, finlayson@live.com, ssm-interest@external.cisco.com Subject: Re: Using DNS for SSM Message-ID: <20010222011335.L1600@omega.cisco.com> References: <20010222024435.49E5BC3C5B@holbrook-laptop.cisco.com> <200102220354.TAA16358@dino-pc.procket.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <200102220354.TAA16358@dino-pc.procket.com>; from dino@procket.com on Wed, Feb 21, 2001 at 07:54:39PM -0800 On Wed, Feb 21, 2001 at 07:54:39PM -0800, Dino Farinacci wrote: > >> I'm not sure I get it. Where in the URL would the SSM DNS name > >> appear? Are you suggesting that kqed.radio.example.com resolves to > >> *both* the unicast address of a web server that is serving up an sdp > >> record *and* to the AA record, in which case we have a URL like this: > > The link can be the AA record. I don't get it. Ok, let me try to summarize what i think: What do we need to anchor channels into the DNS so that we find all the information we want and in any resolver direction we need it ? a) An easy to remember FQDN. - Just a question of how much you pay - a.1) If User tells this FQDN to his ISP, then the ISP wants to get just the (S,G) information to do for example mtrace (S,G) (R) [R being the receiver] Schoch^2: 2 RRs example.com A 10.1.1.1 radio.example.com A 232.1.1.1 Disadvantage: The user can not type in "radio.example.com" into his browser and get an info page about that channel anymore because it's gone for a multicast group address (232.1.1.1). Dino: AA RR radio.example.com AA 10.1.1.1.232.1.1.1 Disadvantage: New RR type ? Q: Isn't there an IPv6 address range globally assigned that could map IPv4 (S,G) pairs ? If there is none, why don't we define one. Then we could use that AAAA RR type. Disadvantage: Ugly. But a cool hack, ain't it ? ;-) How about: "prepend media channel FQDNs": wb20.example.com A 10.30.5.4 ! Just the webserver for the radiostation channel mediachannel1.wb20.example.com A 10.1.1.1 A 232.1.1.1 mediachannel2.wb20.example.com A 10.1.1.1 A 232.1.1.5 audio.wb20.example.com IN CNAME mediachannel1.wb20.example.com video.wb20.example.com IN CNAME mediachannel2.wb20.example.com Find (S,G) information: a) Check out that the FQDN has exactly TWO IN A RRs. If it has, and one is a unicast address and the other a multicast address, we're set. b) If not, prepend "mediachannel1" to the RR and try (a) again. List all (S,G) channels for a session: If the URL starts with mediachannel already, just replace . If not, then strip the first part of the FQDN and replace with mediachannel1 and check again. This allows for common cnames like "audio.wb20.example.com" and "video.wb20.example.com" to be used and still find the generic "mediachannel" names. a.2) More general, if you have an easy to remember name for some "channel" or "session" you would like to have it point to all the stuff you may want to know: - If i want to start a receiver application, what do i have to expect for traffic ? - Which ports is the traffic on ? - If i want to learn more about it, where i look ? - ... The only source of information that's standardized enough and will answer most of these questions is a sessions SDP file (or whatever proprietary equivalents there are). Proposal: radio.example.com TXT "application/sdp=http://www.example.com/sdp/radio.sdp" FQDN TXT "mimetype=url" Tools/applications that want to get to session description from a FQDN would look up TXT records in RFC1464 style (var=value), and look up those where the "var" is a MIME type indicating a session decription type known to the Tool/application. When it finds such a TXT RR, it will try to retrieve the URL indicated in the TXT RR to retrieve everything it ever wanted to know about the session. If the actual session is itself using non-SDP (proprietary) session description formats, then there should be one TXT RR for this session description and another one for a SDP translation of all the session information that can be translated into SDP, so that standard tools are not expected to be able to understand non-standard session descriptions. To cope with the mediachannel/video/audio stuff, an application that tries to find the SDP TXT RR will need to: a) If the FQDN does not have a the TXT RR, then check if it's got exactly two A RRs. If yes, then remove the first part of the FQDN and look again (eg: got video.wb20.kqed.com, strip video, and look again). b) If an administrator wants to figure out what a specific (S,G) or (*,G) state in his router is, a reverse address resolution towards the easy to remember FQDN is helpfull to get from there to the session information: For an (S,G): . PTR FQDN Proposal: 232.1.1.1.ipv4-group.1.1.1.10.in-addr.arpa PTR radio.example.com [Note: It doesn't really matter how the group-encoding is done, as long as there is a standard] For a (*,G): PTR FQDN 19.23.57.233.in-addr.arpa PTR FQDN [Note: We would expect this (*,G) reverse mapping to only work for GLOB addresses, and other addresses that have a static owner. Other group addreses shouldn't be mapped into DNS] -- Toerless From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 22 05:58:22 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id FAA06943 for ; Thu, 22 Feb 2001 05:58:21 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id BAA18752 for ; Thu, 22 Feb 2001 01:41:15 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1M9euF21929 for ; Thu, 22 Feb 2001 01:40:56 -0800 (PST) Received: from cmr1.ash.ops.us.uu.net (cmr1.ash.ops.us.uu.net [198.5.241.39]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1M9eub24053 for ; Thu, 22 Feb 2001 01:40:57 -0800 (PST) Received: from neserve0.corp.us.uu.net by cmr1.ash.ops.us.uu.net with ESMTP (peer crosschecked as: neserve0.corp.us.uu.net [153.39.92.148]) id QQkdlm19689; Thu, 22 Feb 2001 09:39:53 GMT Received: by neserve0.corp.us.uu.net id QQkdlm14873; Thu, 22 Feb 2001 04:39:38 -0500 (EST) From: jhall@UU.NET (Jeremy Hall) Message-Id: Subject: Re: Using DNS for SSM In-Reply-To: <200102220354.TAA16358@dino-pc.procket.com> from Dino Farinacci at "Feb 21, 2001 07:54:39 pm" To: Dino Farinacci Date: Thu, 22 Feb 2001 04:39:38 -0500 (EST) CC: holbrook@cisco.com, bwilliam@cisco.com, finlayson@live.com, ssm-interest@external.cisco.com X-Mailer: ELM [version 2.4ME+ PL60 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Dino, you must be a BIND author. Isn't this a bit excessive? _J In the new year, Dino Farinacci wrote: > >> I'm not sure I get it. Where in the URL would the SSM DNS name > >> appear? Are you suggesting that kqed.radio.example.com resolves to > >> *both* the unicast address of a web server that is serving up an sdp > >> record *and* to the AA record, in which case we have a URL like this: > > The link can be the AA record. > > Dino > From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 22 07:35:20 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id HAA08731 for ; Thu, 22 Feb 2001 07:35:19 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id DAA28375 for ; Thu, 22 Feb 2001 03:34:38 -0800 (PST) From: did342@arabia.com Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1MBY3227680 for ; Thu, 22 Feb 2001 03:34:13 -0800 (PST) Received: from mail.proseekusa.com ([38.184.79.5]) by proxy3.cisco.com (8.11.2/8.11.2) with SMTP id f1MBXxb22024 for ; Thu, 22 Feb 2001 03:33:59 -0800 (PST) Received: (qmail 17819 invoked from network); 22 Feb 2001 04:03:22 -0000 Received: from 1cust142.tnt12.dfw5.da.uu.net (HELO mis.trebley.com) (63.44.237.142) by mail.ipobrain.com with SMTP; 22 Feb 2001 04:03:22 -0000 Message-ID: <0000518a320a$0000726f$00006d11@arbor.Paoli.ATM.LMCO.COM> To: Subject: Brand New Motorola Email Pager FR-EE Date: Wed, 21 Feb 2001 21:52:48 -0600 MIME-Version: 1.0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Priority: 3 X-MSMail-Priority: Normal Reply-To: did342@arabia.com Content-Transfer-Encoding: quoted-printable We are a professional commercial e-mail service t= hat has been in business for over 6 years. 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From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 22 15:12:35 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id PAA25459 for ; Thu, 22 Feb 2001 15:12:34 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id KAA04455 for ; Thu, 22 Feb 2001 10:34:30 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1MIYK311839 for ; Thu, 22 Feb 2001 10:34:20 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1MIYCi22610 for ; Thu, 22 Feb 2001 10:34:12 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id KAA22268; Thu, 22 Feb 2001 10:34:10 -0800 Date: Thu, 22 Feb 2001 10:34:10 -0800 Message-Id: <200102221834.KAA22268@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: jhall@uu.net CC: holbrook@cisco.com, bwilliam@cisco.com, finlayson@live.com, ssm-interest@external.cisco.com In-reply-to: (jhall@UU.NET) Subject: Re: Using DNS for SSM References: >> Dino, you must be a BIND author. Isn't this a bit excessive? Hey, I'm not proposing this idea. Talk to the author of the ID. I'm just pointing out good and bad issues. Dino From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Thu Feb 22 15:38:38 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id PAA26554 for ; Thu, 22 Feb 2001 15:38:37 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id LAA18325 for ; Thu, 22 Feb 2001 11:20:55 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1MJKdQ02308 for ; Thu, 22 Feb 2001 11:20:39 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1MJKZ219052 for ; Thu, 22 Feb 2001 11:20:35 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id LAA01540; Thu, 22 Feb 2001 11:19:22 -0800 Date: Thu, 22 Feb 2001 11:19:22 -0800 Message-Id: <200102221919.LAA01540@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: eckert@cisco.com CC: holbrook@cisco.com, bwilliam@cisco.com, finlayson@live.com, ssm-interest@external.cisco.com In-reply-to: <20010222011335.L1600@omega.cisco.com> (message from Toerless Eckert on Thu, 22 Feb 2001 01:13:35 -0800) Subject: Re: Using DNS for SSM References: <20010222024435.49E5BC3C5B@holbrook-laptop.cisco.com> <200102220354.TAA16358@dino-pc.procket.com> <20010222011335.L1600@omega.cisco.com> >> I don't get it. Toerless, see your patent for details. Dino From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Thu Feb 22 23:45:39 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id XAA08440 for ; Thu, 22 Feb 2001 23:45:38 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id TAA00864 for ; Thu, 22 Feb 2001 19:47:18 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1N3l6h19834 for ; Thu, 22 Feb 2001 19:47:06 -0800 (PST) Received: from NOD.RESTON.MCI.NET ([166.60.6.38]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1N3ktQ02879 for ; Thu, 22 Feb 2001 19:46:56 -0800 (PST) Received: from zaid ([166.60.2.204]) by shoe.reston.mci.net (PMDF V6.0-24 #47392) with SMTP id <01K0FECJONUGA23BTH@shoe.reston.mci.net> for ssm-interest@external.cisco.com; Thu, 22 Feb 2001 22:44:01 -0500 (EST) Date: Thu, 22 Feb 2001 22:39:25 -0500 From: zaid Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM To: Ross Finlayson , mboned@network-services.uoregon.edu Cc: ssm-interest@external.cisco.com Message-id: <012f01c09d4a$3817d2c0$cc023ca6@zaid.loudoun.mci.net> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V4.72.3110.3 X-Mailer: Microsoft Outlook Express 4.72.3110.1 Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT X-Priority: 3 X-MSMail-priority: Normal Content-Transfer-Encoding: 7BIT " (I'm hoping that this will help break the logjam that has held back the widespread adoption of multicast...) " I hope you are right. We (This community) also have to consider the high probability that as a result of this draft no (ISP) will deploy multicast natively . Another sad and high probability is that ISPs start blocking that kind of traffic and start charging for it under the flag of multicast services. Thanks, Zaid -----Original Message----- From: Ross Finlayson To: mboned@network-services.uoregon.edu Cc: ssm-interest@external.cisco.com Date: Thursday, February 22, 2001 10:11 PM Subject: New Internet Draft on automatic (end-user) tunneling for SSM I have just written (with Radia Perlman and Doron Rajwan) a new Internet Draft: Accelerating the Deployment of Multicast Using Automatic Tunneling Abstract Many Internet users currently cannot participate in wide-area IP multicast sessions, because their first-hop routers (or beyond) do not support IP multicast routing. We describe an application level (UDP-based) tunneling mechanism that allows non-multicast-connected users - with no modification to their operating systems - to automatically receive a large class of multicast sessions, pending the deployment of multicast in their upstream routers. ----------- We'll be giving a presentation on this during the MBONED WG session at the Minneapolis IETF. The I-D should get announced shortly; in the meantime, you can find a copy online at . (I'm hoping that this will help break the logjam that has held back the widespread adoption of multicast...) Ross. From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Fri Feb 23 08:06:08 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id IAA00099 for ; Fri, 23 Feb 2001 08:06:08 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id EAA22424 for ; Fri, 23 Feb 2001 04:07:19 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1NC7GM02491 for ; Fri, 23 Feb 2001 04:07:16 -0800 (PST) Received: from dm3cn8.bell.ca (dm3cn8.bell.ca [198.235.69.145]) by proxy1.cisco.com (8.11.2/8.11.2) with SMTP id f1NC7C215320 for ; Fri, 23 Feb 2001 04:07:12 -0800 (PST) Received: from 198.235.69.152 by dm3cn8.bell.ca with ESMTP (WorldSecure Server SMTP Relay(WSS) v4.5); Fri, 23 Feb 2001 07:03:50 -0500 X-Server-Uuid: b85f21a3-cfd1-11d3-8401-00104bf46ab7 Received: from mta2.on.bell.ca (dm2cts.on.bell.ca [198.235.68.149]) by mta2.on.bell.ca with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2650.21) id CYG6XAAV; Fri, 23 Feb 2001 07:03:44 -0500 Received: FROM toroondc754.ON.BELL.CA BY mta2.on.bell.ca ; Fri Feb 23 07:03:44 2001 -0500 Received: by toroondc754 with Internet Mail Service (5.5.2650.21) id ; Fri, 23 Feb 2001 07:03:44 -0500 Message-ID: <69B481AB2D5AD31181AD0008C72B5F8103238E2A@toroondc756> From: "Lepage, Yves" To: "'zalbanna@MCI.NET'" , finlayson@live.com, mboned@network-services.uoregon.edu cc: ssm-interest@external.cisco.com Subject: RE: New Internet Draft on automatic (end-user) tunneling for SSM Date: Fri, 23 Feb 2001 07:03:42 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) X-WSS-ID: 16888E2A151550-01-01 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit > I hope you are right. We (This community) also have to consider the > high > probability that as a result of this draft no (ISP) will deploy > multicast natively . I think on the contrary that this new tunneling mechanism will create the demand required for native multicast deployment. Also, it will create an incentive for ISPs to deploy native multicast with the goal of decreasing the traffic generated by hundreds or thousands of individual tunnels. Congratulations Ross, this was much needed. Regards, Yves Lepage Standard Disclaimer. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Fri Feb 23 08:59:56 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id IAA01744 for ; Fri, 23 Feb 2001 08:59:56 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id FAA17705 for ; Fri, 23 Feb 2001 05:01:50 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1ND1fK14091 for ; Fri, 23 Feb 2001 05:01:41 -0800 (PST) Received: from cmr1.ash.ops.us.uu.net (cmr1.ash.ops.us.uu.net [198.5.241.39]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1ND1Ui29399 for ; Fri, 23 Feb 2001 05:01:30 -0800 (PST) Received: from neserve0.corp.us.uu.net by cmr1.ash.ops.us.uu.net with ESMTP (peer crosschecked as: neserve0.corp.us.uu.net [153.39.92.148]) id QQkdps23924; Fri, 23 Feb 2001 13:00:30 GMT Received: by neserve0.corp.us.uu.net id QQkdps19648; Fri, 23 Feb 2001 08:00:20 -0500 (EST) From: jhall@UU.NET (Jeremy Hall) Message-Id: Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM In-Reply-To: <012f01c09d4a$3817d2c0$cc023ca6@zaid.loudoun.mci.net> from zaid at "Feb 22, 2001 10:39:25 pm" To: zaid Date: Fri, 23 Feb 2001 08:00:20 -0500 (EST) CC: Ross Finlayson , mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com, Jason Schiller , Beth Vu , Juzer Kopti X-Mailer: ELM [version 2.4ME+ PL60 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Hi, Am I to understand this right, multicast routers are suppost to snoop ALL UDP traffic that matches this port and process switch it? Are you making the assumption that 1: the source is reachable from the receiver unicastly 2: somewhere unicast and multicast align 3: unicast and multicast topologies are congruent _J In the new year, zaid wrote: > > " (I'm hoping that this will help break the logjam that has held back > the > widespread adoption of multicast...) " > > I hope you are right. We (This community) also have to consider the > high > probability that as a result of this draft no (ISP) will deploy > multicast natively . > Another sad and high probability is that ISPs start blocking that kind > of traffic and start charging for it under the flag of multicast > services. > > Thanks, > Zaid > > -----Original Message----- > From: Ross Finlayson > To: mboned@network-services.uoregon.edu > > Cc: ssm-interest@external.cisco.com > Date: Thursday, February 22, 2001 10:11 PM > Subject: New Internet Draft on automatic (end-user) tunneling for SSM > > > I have just written (with Radia Perlman and Doron Rajwan) a new > Internet Draft: > > Accelerating the Deployment of Multicast Using Automatic > Tunneling > > > > Abstract > > Many Internet users currently cannot participate in wide-area IP > multicast sessions, because their first-hop routers (or beyond) do not > support IP multicast routing. We describe an application level > (UDP-based) tunneling mechanism that allows non-multicast-connected > users - with no modification to their operating systems - to > automatically receive a large class of multicast sessions, pending the > deployment of multicast in their upstream routers. > ----------- > > We'll be giving a presentation on this during the MBONED WG session at > the > Minneapolis IETF. The I-D should get announced shortly; in the > meantime, > you can find a copy online at . > > (I'm hoping that this will help break the logjam that has held back > the > widespread adoption of multicast...) > > Ross. > > > From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Fri Feb 23 11:20:35 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id LAA07367 for ; Fri, 23 Feb 2001 11:20:34 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id HAA21674 for ; Fri, 23 Feb 2001 07:06:44 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1NF6fN14598 for ; Fri, 23 Feb 2001 07:06:41 -0800 (PST) Received: from cclab.chungnam.ac.kr (cclab.cs.chungnam.ac.kr [168.188.129.51]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1NF6fe14578 for ; Fri, 23 Feb 2001 07:06:42 -0800 (PST) Received: from cclab.cnu.ac.kr (bach [168.188.129.55]) by cclab.chungnam.ac.kr (8.9.3/8.9.3) with ESMTP id AAA25371; Sat, 24 Feb 2001 00:01:30 +0900 (KST) Message-ID: <3A967AF3.2C32A474@cclab.cnu.ac.kr> Date: Sat, 24 Feb 2001 00:00:03 +0900 From: Sang-Ha Kim X-Mailer: Mozilla 4.72 [en] (Windows NT 5.0; I) X-Accept-Language: en MIME-Version: 1.0 To: ssm-interest@external.cisco.com, maddogs@ietf.org Subject: [SSM] Please give some comments on my Internet draft. Content-Type: text/plain; charset=EUC-KR Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Sang-Ha Kim wrore: I have registered my manuscript to Internet Draft list under the name of "draft-kim-ssm-hierarchical-scheme-00.txt". The manuscript describes a suggestion for rapid deployment of SSM. I do discuss this matter with you. Please give me some comments on it. My draft is avaiable from IETF Internet-Drafts by searching "draft-kim-ssm-hierarchical-scheme-00.txt". This is the first time for me to submit an Internet Draft, and by my ignorance, I may not follow the rule that everybody should do. If it is the case, please let me know that. Thank you for your attention. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Fri Feb 23 13:11:56 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id NAA12583 for ; Fri, 23 Feb 2001 13:11:52 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id IAA16348 for ; Fri, 23 Feb 2001 08:26:14 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1NGQ5c21939 for ; Fri, 23 Feb 2001 08:26:05 -0800 (PST) Received: from guppy.vub.ac.be (guppy.vub.ac.be [134.184.129.2]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1NGPlM29715 for ; Fri, 23 Feb 2001 08:25:48 -0800 (PST) Received: from info1.vub.ac.be (info1.vub.ac.be [134.184.1.1]) by guppy.vub.ac.be (8.9.1b+Sun/3.17.0.ap (guppy)) id RAA17676; Fri, 23 Feb 2001 17:23:19 +0100 (MET) for Received: from info.vub.ac.be by info1.vub.ac.be (SMI-8.6/SMI-SVR4-INFO-HUB-110196) id RAA07108; Fri, 23 Feb 2001 17:25:17 +0100 Message-ID: <3A968E36.CF2291EE@info.vub.ac.be> Date: Fri, 23 Feb 2001 17:22:14 +0100 From: Pieter Liefooghe X-Mailer: Mozilla 4.7 [en] (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: Jeremy Hall , Ross Finlayson , zaid , mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com, Jason Schiller , Beth Vu , Juzer Kopti CC: Ip multicast Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM References: Content-Type: multipart/mixed; boundary="------------8E28CB8D4EC2888CF09A7C92" This is a multi-part message in MIME format. --------------8E28CB8D4EC2888CF09A7C92 Content-Type: text/plain; charset=iso-8859-1 X-MIME-Autoconverted: from 8bit to quoted-printable by sj-msg-core-2.cisco.com id IAA16350 Content-Transfer-Encoding: quoted-printable Jeremy Hall wrote: > Hi, > > Am I to understand this right, multicast routers are suppost to snoop A= LL > UDP traffic that matches this port and process switch it? > > Are you making the assumption that > > 1: the source is reachable from the receiver unicastly > > 2: somewhere unicast and multicast align > > 3: unicast and multicast topologies are congruent Jeremy, All the issues you mentioned are - as far I understand that draft - true! I think that a solution should be: 1. As generic as possible. It should not be limited to SSM. From the moment we do have enough pe= ople who have access to it, I really think that we will be seeing some collaborative tools that do use IP multicast....One very nice application could be: Multicast Napster. ;-) 2. As transparent as possible. An ideal solution should not require any modification to the network infrastructure (Hey, why is IP Multicast so slow in being deployed !?). A= nd preferably, we don't want any modification to the applications; If we hav= e to wait till we have a new generation of tunnel enabled applications we are going to wait a long time! 3. The least intrusive as possible. As noted, you cannot expect a router to SNOOP on every UDP packet! You do= n't want to touch that Router that after several hours - and probably days - = is finally running PIM-SM & MSDP the way it should. ;-) 4. Require No modification to the Multicast paradigm. You can't expect the unicast and multicast topologies to be congruent, IP multicast flows in the reverse direction as unicast, and in some situatio= ns there is simply no such return path (cfr. Satellite links etc.), but also peering agreements force ISPs and Carrier= s to have such topologies. This is why I think the solution, I have been working on, is a more reasonable attempt at the problem. Full details are available in the attached paper that was presented at th= e IEEE Local Computer Network Conference in Tampa, FL November 2000. Note: Some things did change over the past couple of months as a result o= f the ongoing development/research in this area! The attached paper contain= s an error in the formula for the metric: it should use (Loss)/10 and NOT (1-Loss)/10! But for those in a hurry, here is a little summary: 1. Deploy in the "IP Multicast cloud" several Application level (e.g. UDP= ) Tunnel Servers (Or add a Tunnel Server Service to routers?) Ideal places: ISPs, Content Providers, Carriers who did turn IT on. 2. Let these Tunnel Servers register themselves in a central Tunnel Datab= ase server. The Registration Message contains Information about the Network(s= ) for which this server wants to act as tunnel server and the country in wh= ich it is located. This Tunnel Database will hence contain a list with the available Tunnel Servers. 3. An end-user uses a modified Session Directory application. (or uses a = new generation of multicast application where the tunneling is integrated.) This application is modified in such a way that whenever it detects t= hat there is no native IP multicast, it sends out a query message towards the central Tunnel Database server. This (HTTP) query contains the IP address of the client and the Count= ry where the client is located. At the Tunnel Database server we first perfo= rm a longest prefix match between the Client IP address and the network addres= s ranges provided for each tunnel server. If such entries do exist, this yi= elds one or more tunnel servers located in the "Network" of the end-user. If this is not the case, we locate all Tunnel servers in the Country of t= hat client. If there are no tunnel servers for that country, we try to locate= a server in the "Region" of the country. (e.g. End-user in Belgium, but no Tunnel Server in Belgium would get a list of Tunnel Servers in - lets say - France and Holland.) If we don't find such= a Tunnel Server in the region a default one is provided. (Located in my lab ;-) ) As a result of this query we get the addresses of one or more tunnel serv= ers. 4. If we have multiple potential tunnel servers, we determine the "Best=94 Tunnel Server to use. The Best Tunnel server is determined by using a "TCP-Friendly" measurement of the Packet Loss, Delay and Throughput along the path betwe= en the client and the potential Tunnel Server. We use these parameters in a formula, which yields us a metric of the path between the client and the server. (cfr. paper) During the measurement we already tunnel between the client and a randomly chosen Tunnel Server (or we use the previously used Tunnel Serve= r if this is again in the list). The end-user is hence immediately "connected" to the Multicast Networ= k! 5. After the measurement round we set up a tunnel towards the "Best" tunn= el server and we do a "session hand-over" between the "temporary" tunnel and= the final tunnel. 6. If this is integrated in a Session Directory tool it is now possible t= o launch any existing IP Multicast application without modification because= the session directory tool knows which multicast address/port numbers will be used by the application and hence is capable of triggering the tunneling = of these sessions at launch time. All received data is =93re-multicasted=94 = locally at the end-user. The protocol is based on UMTP (the protocol also used in the "New Interne= t Draft on automatic (end-user) tunneling for SSM"), but "enhanced" to allo= w dynamic tunneling through a firewall (cfr. paper). Probably we will also = need one or more extra fields to carry the Source address in case of a SSM multicast session. The architecture described in the paper also contains a part about how yo= u can locate a SAP/SDP Proxy and how you can retrieve cached SDP Session Announcements from it and also how you can use it as a remote announcer o= f SDP Sessions. - But this is probably less interesting for the mboned work= ing group - zaid also made the remark that : " We (This community) also have to consider the high probability that as a result of this draft= no (ISP) will deploy multicast natively ". At least, with my solution you give all unicast end-users the POSSIBILITY= to access IP multicast content. The mere fact that they do have this possibi= lity will trigger Content Providers in sending out in an IP multicast format. Hence after some time - and with the right publicity and enough =93intere= sting=94 content - you will automatically have enough people who are using it. If = the deployment/management cost of Native IP multicast drops below the cost of= the "wasted" bandwidth, we will immediately see that ISPs will start to deplo= y IP multicast natively! Another nice thing about this solution is that it can be deployed gradual= ly, and this without modification to the Network infrastructure! A typical scenario could look like this: An ISP wants to differentiate it= self from all the others and starts to offer this "new" IP Multicast service f= or FREE. They can do this easily because they only need to enable IP multicast on = one router (Hey, they could even - at first - simply use a DVMRP tunnel!). They only deploy one (or more) Tunnel Database servers at that location. = All tunnel end-users of that ISP will - by the mere property of the longest prefix match query in the Tunnel Database- start to use these Tunnel Serv= ers. The clients are automatically load balanced over the "cluster" of tunnel servers. When an ISP sees an increased demand for tunnels, the ISP has tw= o options: Add an extra Tunnel Server or deploy native IP multicast! The ch= oice between these will be "influenced" by the ratio between the deployment/management cost of IP multicast and the cost of the wasted bandwidth. But probably people from the ISP community on these lists could give thei= r point of view on this deployment strategy? Ok, these are my ideas on this topic. I do hope people find it interestin= g enough to discuss this any further.... If enough interest, I even might consider coming to the next IETF meeting to present this. ;-) Bye, Pieter -----Original Message----- From: Ross Finlayson To: mboned@network-services.uoregon.edu Cc: ssm-interest@external.cisco.com Date: Thursday, February 22, 2001 10:11 PM Subject: New Internet Draft on automatic (end-user) tunneling for SSM I have just written (with Radia Perlman and Doron Rajwan) a new Internet Draft: Accelerating the Deployment of Multicast Using Automatic Tunneling Abstract Many Internet users currently cannot participate in wide-area IP multicast sessions, because their first-hop routers (or beyond) do not support IP multicast routing. We describe an application level (UDP-based) tunneling mechanism that allows non-multicast-connected users - with no modification to their operating systems - to automatically receive a large class of multicast sessions, pending the deployment of multicast in their upstream routers. ----------- We'll be giving a presentation on this during the MBONED WG session at the Minneapolis IETF. The I-D should get announced shortly; in the meantime, you can find a copy online at . (I'm hoping that this will help break the logjam that has held back the widespread adoption of multicast...) Ross. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Pieter Liefooghe Research Assistant Vrije Universiteit Brussel (INFO/TW) Digital Telecom Dept. Pleinlaan 2 1050 Brussel BELGIUM Tel: +32-2-629.29.77 Fax: +32-2-629.28.70 pieter@info.vub.ac.be http://www.castguide.com Quote of the day: Any program that runs right is obsolete. --------------8E28CB8D4EC2888CF09A7C92 Content-Type: application/pdf; name="IEEE_LC00_Final.pdf" Content-Disposition: inline; filename="IEEE_LC00_Final.pdf" Content-Transfer-Encoding: base64 JVBERi0xLjMNJeLjz9MNCjE1NSAwIG9iag08PCANL0xpbmVhcml6ZWQgMSANL08gMTU3IA0v SCBbIDEyNDIgNjc3IF0gDS9MIDE4ODM5NiANL0UgNDA0MzIgDS9OIDcgDS9UIDE4NTE3NyAN Pj4gDWVuZG9iag0gICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICB4cmVmDTE1NSA0MCANMDAwMDAwMDAxNiAwMDAwMCBuDQowMDAwMDAxMTUx IDAwMDAwIG4NCjAwMDAwMDE5MTkgMDAwMDAgbg0KMDAwMDAwMjEzNyAwMDAwMCBuDQowMDAw MDAyMjc5IDAwMDAwIG4NCjAwMDAwMDI4MTkgMDAwMDAgbg0KMDAwMDAwMzQxMCAwMDAwMCBu DQowMDAwMDAzNTkyIDAwMDAwIG4NCjAwMDAwMDczMjcgMDAwMDAgbg0KMDAwMDAwNzY1OSAw MDAwMCBuDQowMDAwMDA3OTQ0IDAwMDAwIG4NCjAwMDAwMjAzMDMgMDAwMDAgbg0KMDAwMDAy 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15:15:27 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id LAA01328 for ; Fri, 23 Feb 2001 11:04:24 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1NJ4T301269 for ; Fri, 23 Feb 2001 11:04:29 -0800 (PST) Received: from ns.live.com (ns.live.com [208.184.148.162]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1NJ4HM17910 for ; Fri, 23 Feb 2001 11:04:18 -0800 (PST) Received: (from rsf@localhost) by ns.live.com (8.9.3/8.9.3) id KAA69960; Fri, 23 Feb 2001 10:59:16 -0800 (PST) (envelope-from rsf) Message-Id: <4.3.1.1.20010223104115.00c5b8c0@localhost> X-Sender: rsf@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Fri, 23 Feb 2001 10:58:53 -0800 To: jhall@uu.net (Jeremy Hall) From: Ross Finlayson Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM Cc: mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com, Jason Schiller , Beth Vu , Juzer Kopti In-Reply-To: References: <012f01c09d4a$3817d2c0$cc023ca6@zaid.loudoun.mci.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed At 05:00 AM 2/23/01, Jeremy Hall wrote: >Are you making the assumption that > >1: the source is reachable from the receiver unicastly > >2: somewhere unicast and multicast align > >3: unicast and multicast topologies are congruent The proposal ("UDP tunneling with router interception") does *not* require that the unicast and multicast topologies are identical - only that they overlap in places. (The tunneling for each recipient takes place from the first upstream router at which they overlap.) I agree that this doesn't help much for very asymmetrical networks (such as satellite downlinks), but fortunately these networks are likely to be multicast-enabled anyway. Ross. From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Fri Feb 23 16:21:19 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id QAA22148 for ; Fri, 23 Feb 2001 16:21:18 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id MAA27377 for ; Fri, 23 Feb 2001 12:15:52 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1NKFeK12594 for ; Fri, 23 Feb 2001 12:15:40 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1NKFYe18293 for ; Fri, 23 Feb 2001 12:15:34 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id MAA23686; Fri, 23 Feb 2001 12:14:47 -0800 Date: Fri, 23 Feb 2001 12:14:47 -0800 Message-Id: <200102232014.MAA23686@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: finlayson@live.com CC: jhall@uu.net, mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com, schiller@uu.net, bvu@uu.net, juzer@uu.net In-reply-to: <4.3.1.1.20010223104115.00c5b8c0@localhost> (message from Ross Finlayson on Fri, 23 Feb 2001 10:58:53 -0800) Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM References: <012f01c09d4a$3817d2c0$cc023ca6@zaid.loudoun.mci.net> <4.3.1.1.20010223104115.00c5b8c0@localhost> >> Ross. Ross, some quick comments: o Indicate the packet format encoding for join and prune messages. If they are simply IGMPv3 over UDP, indciate that. o Be very clear that the Router-Alert option is used for control packets from master to slave. This is what Jeremy freaked on. o Indicate that data packets from the slave to the master do not need to be UDP checksummed. Or else, this won't get deployed. Routers doing complete packet checksums in the data path is a non-starter. o Be more clear about "data packets from the master are processed like any other multicast packet in the router". This is certaily not true. Multicast routers do RPF checks based on incoming interface. Packets coming over the UDP tunnel need different handling. And make sure the host/master doesn't UDP checksum the packet either. o Indicate how TTL and TOS header bits are handled. That is, is the UDP tunnel 1-hop or more. And if more than 1, you need a mechanism find out. o What is the source IP address of the UDP encapsulated packet forwarded by the encapsulating router. o And as always with tunnels. How do you propose to deal with MTU issues since an additional 28 bytes are added to the data packet. o Also, justify why you're not using GRE. 24 bytes of overhead is better than 28 plus there are 1000s of deployed routers that support GRE tunneling. Some doing it in hardware. Dino From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Fri Feb 23 17:16:24 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id RAA24525 for ; Fri, 23 Feb 2001 17:16:23 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id MAA02503 for ; Fri, 23 Feb 2001 12:54:42 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1NKsQd10533 for ; Fri, 23 Feb 2001 12:54:26 -0800 (PST) Received: from red.juniper.net (red.juniper.net [207.17.136.137]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1NKsRe06202 for ; Fri, 23 Feb 2001 12:54:27 -0800 (PST) Received: from maroon.jnpr.net (maroon.jnpr.net [172.24.244.36]) by red.juniper.net (8.9.3/8.9.3) with ESMTP id MAA24814; Fri, 23 Feb 2001 12:49:19 -0800 (PST) Received: from localhost (lenny@localhost) by maroon.jnpr.net (8.9.3/8.9.3) with ESMTP id MAA78499; Fri, 23 Feb 2001 12:49:10 -0800 (PST) (envelope-from lenny@juniper.net) X-Authentication-Warning: maroon.jnpr.net: lenny owned process doing -bs Date: Fri, 23 Feb 2001 12:49:10 -0800 (PST) From: Leonard Giuliano X-Sender: lenny@maroon.jnpr.net To: zaid cc: Ross Finlayson , mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM In-Reply-To: <012f01c09d4a$3817d2c0$cc023ca6@zaid.loudoun.mci.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII *> *>" (I'm hoping that this will help break the logjam that has held back *>the widespread adoption of multicast...) " *> *>I hope you are right. We (This community) also have to consider the *>high probability that as a result of this draft no (ISP) will deploy *>multicast natively . Another sad and high probability is that ISPs *>start blocking that kind of traffic and start charging for it under *>the flag of multicast services. *> That may be an initial reaction, but I think a good argument could be made that this sort of tunneling would finally provide an ISP a good incentive to deploy multicast natively. If such a thing existed, multicast enabled ISPs could finally attract content providers by saying that they could multicast on their network and expect it to actually reach people. It would benefit the multicast enabled networks by eliminating duplicated unicast traffic across their backbone at a cost of tunnels at the edge (would be interesting to see what this cost will be). Non-enabled networks would see that traffic is being tunneled and duplicated over their network, and have a strong incentive to deploy natively. Content providers would be able to multicast content and expect someone to actually get it, and thereby create more content. A cool idea as long as the cost of these tunnels is reasonable. From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Fri Feb 23 18:28:44 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id SAA26684 for ; Fri, 23 Feb 2001 18:28:44 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id OAA29978 for ; Fri, 23 Feb 2001 14:15:43 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1NMFbZ01356 for ; Fri, 23 Feb 2001 14:15:37 -0800 (PST) Received: from ns.live.com (ns.live.com [208.184.148.162]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1NMFWi12718 for ; Fri, 23 Feb 2001 14:15:32 -0800 (PST) Received: (from rsf@localhost) by ns.live.com (8.9.3/8.9.3) id OAA76707; Fri, 23 Feb 2001 14:10:31 -0800 (PST) (envelope-from rsf) Message-Id: <4.3.1.1.20010223133945.00af5220@localhost> X-Sender: rsf@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Fri, 23 Feb 2001 14:10:14 -0800 To: Dino Farinacci From: Ross Finlayson Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM Cc: jhall@uu.net, mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com, schiller@uu.net, bvu@uu.net, juzer@uu.net In-Reply-To: <200102232014.MAA23686@dino-pc.procket.com> References: <4.3.1.1.20010223104115.00c5b8c0@localhost> <012f01c09d4a$3817d2c0$cc023ca6@zaid.loudoun.mci.net> <4.3.1.1.20010223104115.00c5b8c0@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Dino, thanks for the comments. > o Indicate the packet format encoding for join and prune messages. The packet format for these packets is UMTP, which is defined in a separate Internet Draft . The tunneling draft makes this clear, I hope! (In reality, the actual tunneling protocol that ends up getting used might end up being a 'UMTP-light', as the current UMTP was designed for arbitrary multicast (SSM or ISM) tunneling between arbitrary end nodes - and so is (arguably) a little heavier-weight than needed here.) > o Be very clear that the Router-Alert option is used for control packets > from master to slave. No go. The scheme *has* to be usable by existing users, without operating system changes (e.g., the millions of people running Windoze 9x) - otherwise it's of little value, IMHO. The control packets sent by end-user machines need to be regular UDP packets. Routers will need to trap these control packets based upon their destination UDP port; they can't rely on the "Router-Alert" option. > o Indicate that data packets from the slave to the master do not need to > be UDP checksummed. OK, fair enough. > o Be more clear about "data packets from the master are processed like > any other multicast packet in the router". This is certaily not true. Yes, that's not true - and in fact I don't say this anywhere. I think you may have misread the last paragraph of section 4. > o Indicate how TTL and TOS header bits are handled. That is, is the UDP > tunnel 1-hop or more. Potentially many-hop. Remember, the end-user (master) application just sends out regular UDP packets, addressed to the SSM source. Non-multicast-capable routers forward these as many times as necessary, until a multicast/tunneling-capable router is reached. > o What is the source IP address of the UDP encapsulated packet forwarded > by the encapsulating router. The draft currently doesn't say anything about this. UMTP, as currently defined, uses source IP addresses for authentication, in which case the router would need to set the source IP address of the tunneled DATA packet to the SSM source. But if it would be better for the router to use its own IP address instead, then that's something that could be changed... > o And as always with tunnels. How do you propose to deal with MTU issues > since an additional 28 bytes are added to the data packet. For now at least, I don't propose doing anything about this. If fragmentation happens, then tough :-) > o Also, justify why you're not using GRE. 24 bytes of overhead is better > than 28 plus there are 1000s of deployed routers that support GRE > tunneling. Some doing it in hardware. Right, but can GRE work on top of UDP (and if so, can it be implemented in applications, without OS changes)? And does it contain control packets (JOIN_GROUP, LEAVE_GROUP, etc.)? That's why a dedicated UDP-based multicast tunneling protocol (UMTP) is used. Ross. From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Fri Feb 23 20:54:14 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id UAA28561 for ; Fri, 23 Feb 2001 20:54:14 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id QAA09362 for ; Fri, 23 Feb 2001 16:43:27 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1O0hP024411 for ; Fri, 23 Feb 2001 16:43:25 -0800 (PST) Received: from guppy.vub.ac.be (guppy.vub.ac.be [134.184.129.2]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1O0hPe09250 for ; Fri, 23 Feb 2001 16:43:25 -0800 (PST) Received: from info1.vub.ac.be (info1.vub.ac.be [134.184.1.1]) by guppy.vub.ac.be (8.9.1b+Sun/3.17.0.ap (guppy)) id BAA16059; Sat, 24 Feb 2001 01:41:10 +0100 (MET) for Received: from info.vub.ac.be by info1.vub.ac.be (SMI-8.6/SMI-SVR4-INFO-HUB-110196) id BAA09122; Sat, 24 Feb 2001 01:43:07 +0100 Message-ID: <3A970302.927BE51F@info.vub.ac.be> Date: Sat, 24 Feb 2001 01:40:35 +0100 From: Pieter Liefooghe X-Mailer: Mozilla 4.7 [en] (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: Jeremy Hall , Ross Finlayson , zaid , MBoned , SSM , Jason Schiller , Beth Vu , Juzer Kopti Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit (Repost of my own message from feb. 23th 17:00 GMT+1, which never got through to the list!? - if you receive it multiple times - sorry) Ross et al., I think that a tunneling solution should be: 1. As generic as possible. It should not be limited to SSM. From the moment we do have enough people who have access to it, I really think that we will be seeing some collaborative tools that do use IP multicast....One very nice application could be: Multicast Napster. ;-) 2. As transparent as possible. An ideal solution should not require any modification to the network infrastructure (Hey, why is IP Multicast so slow in being deployed !?). And preferably, we don't want any modification to the applications; If we have to wait till we have a new generation of tunnel enabled applications we are going to wait a long time! 3. The least intrusive as possible. As noted, you cannot expect a router to SNOOP on every UDP packet! You don't want to touch that Router that after several hours - and probably days - is finally running PIM-SM & MSDP the way it should. ;-) 4. Require No modification to the Multicast paradigm. You can't expect the unicast and multicast topologies to be congruent, IP multicast flows in the reverse direction as unicast, and in some situations there is simply no such return path (cfr. Satellite links etc.), but also peering agreements force ISPs and Carriers to have such topologies. This is why I think the solution, I have been working on, is a more reasonable attempt at the problem. Full details are available in a paper that was presented at the IEEE Local Computer Network Conference in Tampa, FL November 2000 and which is available for download from: http://telecom.vub.ac.be/LCN00.pdf Note: Some things did change over the past couple of months as a result of the ongoing development/research in this area! The attached paper contains an error in the formula for the metric: it should use (Loss)/10 and NOT (1-Loss)/10! But for those in a hurry, here is a little summary: 1. Deploy in the "IP Multicast cloud" several Application level (e.g. UDP) Tunnel Servers (Or add a Tunnel Server Service to routers?) Ideal places: ISPs who want to "try" IP multicast without too much effort. 2. Let these Tunnel Servers register themselves in a central Tunnel Database server. The Registration Message contains information about the Network(s) for which this server wants to act as tunnel server and the country in which it is located. This Tunnel Database will hence contain a list with the available Tunnel Servers. 3. An end-user uses a modified Session Directory application. (or uses a new generation of multicast application where the tunneling is integrated.) This application is modified in such a way that whenever it detects that there is no native IP multicast, it sends out a query message towards the central Tunnel Database server. This (HTTP) query contains the IP address of the client and the Country where the client is located. At the Tunnel Database server we first perform a longest prefix match between the Client IP address and the network address ranges provided for each tunnel server. If such entries do exist, this yields one or more tunnel servers located in the "Network" of the end-user. If this is not the case, we locate all Tunnel servers in the Country of that client. If there are no tunnel servers for that country, we try to locate a server in the "Region" of the country. (e.g. End-user in Belgium, but no Tunnel Server in Belgium would get a list of Tunnel Servers in - lets say - France and Holland.) If we don't find such a Tunnel Server in the region a default one is provided. (currently Located in my lab ;-) ) As a result of this query we get the addresses of one or more tunnel servers. 4. If we have multiple potential tunnel servers, we determine the "Best Tunnel Server to use. The Best Tunnel server is determined by using a "TCP-Friendly" measurement of the Packet Loss, Delay and Throughput along the path between the client and the potential Tunnel Server. We use these parameters in a formula, which yields us a metric of the path between the client and the server. (cfr.paper) During the measurement we already tunnel between the client and a randomly chosen Tunnel Server (or we use the previously used Tunnel Server if this is again in the list). The end-user is hence immediately "connected" to the Multicast Network! 5. After the measurement round we set up a tunnel towards the "Best" tunnel server and we do a "session hand-over" between the "temporary" tunnel and the final tunnel. 6. If this is integrated in a Session Directory tool it is now possible to launch any existing IP Multicast application without modification because the session directory tool knows which multicast address/port numbers will be used by the application and hence is capable of triggering the tunneling of these sessions at launch time. All received data is re-multicasted locally at the end-user. The protocol is based on UMTP (the protocol also used in the "New Internet Draft on automatic (end-user) tunneling for SSM"), but "enhanced" to allow dynamic tunneling through a firewall (cfr. paper). Probably we will also need one or more extra fields to carry the Source address in case of a SSM multicast session. The architecture described in the paper also contains a part about how you can locate a SAP/SDP Proxy and how you can retrieve cached SDP Session Announcements from it and also how you can use it as a remote announcer of SDP Sessions. - But this is probably less interesting for the mboned working group - zaid also made the remark that : " We (This community) also have to consider the high probability that as a result of this draft no (ISP) will deploy multicast natively ". At least, with my solution you give all unicast end-users the POSSIBILITY to access IP multicast content. The mere fact that they do have this possibility will trigger Content Providers in sending out in an IP multicast format. Hence after some time - and with the right publicity and enough interesting content - you will automatically have enough people who are using it. If the deployment/management cost of Native IP multicast drops below the cost of the "wasted" bandwidth, we will immediately see that ISPs will start to deploy IP multicast natively! Another nice thing about this solution is that it can be deployed gradually, and this without modification to the Network infrastructure! A typical scenario could look like this: An ISP wants to differentiate itself from all the others and starts to offer this "new" IP Multicast service (for FREE..the money will come later from the saved bandwidth when native IP multicast is deployed). They can do this easily because they only need to enable IP multicast on one router (Hey, they could even - at first - simply use a DVMRP tunnel!). They only deploy one (or more) Tunnel Database servers at that location. All tunnel end-users of that ISP will - by the mere property of the longest prefix match query in the Tunnel Database- start to use these Tunnel Servers. The clients are automatically load balanced over the "cluster" of tunnel servers. When an ISP sees an increased demand for tunnels, the ISP has two options: Add an extra Tunnel Server or deploy native IP multicast! The choice between these will be "influenced" by the ratio between the deployment/management cost of IP multicast and the cost of the wasted bandwidth. But probably people from the ISP community on these lists could give their point of view on this deployment strategy? Ok, these are my ideas on this topic. I do hope people find it interesting enough to discuss this any further.... If enough interest, I even might consider coming to the next IETF meeting to present this. ;-) Bye, Pieter -----Original Message----- From: Ross Finlayson To: mboned@network-services.uoregon.edu Cc: ssm-interest@external.cisco.com Date: Thursday, February 22, 2001 10:11 PM Subject: New Internet Draft on automatic (end-user) tunneling for SSM I have just written (with Radia Perlman and Doron Rajwan) a new Internet Draft: Accelerating the Deployment of Multicast Using Automatic Tunneling Abstract Many Internet users currently cannot participate in wide-area IP multicast sessions, because their first-hop routers (or beyond) do not support IP multicast routing. We describe an application level (UDP-based) tunneling mechanism that allows non-multicast-connected users - with no modification to their operating systems - to automatically receive a large class of multicast sessions, pending the deployment of multicast in their upstream routers. ----------- We'll be giving a presentation on this during the MBONED WG session at the Minneapolis IETF. The I-D should get announced shortly; in the meantime, you can find a copy online at . (I'm hoping that this will help break the logjam that has held back the widespread adoption of multicast...) Ross. -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Pieter Liefooghe Research Assistant Vrije Universiteit Brussel (INFO/TW) Digital Telecom Dept. Pleinlaan 2 1050 Brussel BELGIUM Tel: +32-2-629.29.77 Fax: +32-2-629.28.70 pieter@info.vub.ac.be http://www.castguide.com Quote of the day: Any program that runs right is obsolete. From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Fri Feb 23 23:31:51 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id XAA02345 for ; Fri, 23 Feb 2001 23:31:50 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id SAA26683 for ; Thu, 22 Feb 2001 18:30:39 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1N2UJZ09216 for ; Thu, 22 Feb 2001 18:30:19 -0800 (PST) Received: from ns.live.com (ns.live.com [208.184.148.162]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1N2UKa23456 for ; Thu, 22 Feb 2001 18:30:20 -0800 (PST) Received: (from rsf@localhost) by ns.live.com (8.9.3/8.9.3) id SAA35051; Thu, 22 Feb 2001 18:25:16 -0800 (PST) (envelope-from rsf) Message-Id: <4.3.1.1.20010222181102.00b2abe0@localhost> X-Sender: rsf@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Thu, 22 Feb 2001 18:25:13 -0800 To: mboned@network-services.uoregon.edu From: Ross Finlayson Subject: New Internet Draft on automatic (end-user) tunneling for SSM Cc: ssm-interest@external.cisco.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed I have just written (with Radia Perlman and Doron Rajwan) a new Internet Draft: Accelerating the Deployment of Multicast Using Automatic Tunneling Abstract Many Internet users currently cannot participate in wide-area IP multicast sessions, because their first-hop routers (or beyond) do not support IP multicast routing. We describe an application level (UDP-based) tunneling mechanism that allows non-multicast-connected users - with no modification to their operating systems - to automatically receive a large class of multicast sessions, pending the deployment of multicast in their upstream routers. ----------- We'll be giving a presentation on this during the MBONED WG session at the Minneapolis IETF. The I-D should get announced shortly; in the meantime, you can find a copy online at . (I'm hoping that this will help break the logjam that has held back the widespread adoption of multicast...) Ross. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Sat Feb 24 04:05:06 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id EAA17957 for ; Sat, 24 Feb 2001 04:05:05 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id XAA23933 for ; Fri, 23 Feb 2001 23:40:44 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1O7eSW25183 for ; Fri, 23 Feb 2001 23:40:28 -0800 (PST) Received: from ns.live.com (ns.live.com [208.184.148.162]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1O7eTe12032 for ; Fri, 23 Feb 2001 23:40:29 -0800 (PST) Received: (from rsf@localhost) by ns.live.com (8.9.3/8.9.3) id XAA96315; Fri, 23 Feb 2001 23:35:26 -0800 (PST) (envelope-from rsf) Message-Id: <4.3.1.1.20010223230702.00b3a360@localhost> X-Sender: rsf@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Fri, 23 Feb 2001 23:35:15 -0800 To: Dino Farinacci From: Ross Finlayson Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM Cc: mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed > o Also, justify why you're not using GRE. Dino (et al), Let me apologize for my somewhat flippant response to your earlier question about not using GRE (especially since at the time I had forgotten that you were one of GRE's authors :-) :-) I do remember considering GRE when I first designed UMTP (back in 1997). I took another look at the GRE spec just now, and I can now recall why I chose not to use GRE - the space overhead would have been too great. From my understanding of GRE (please correct me if I'm wrong), the overhead to tunnel an arbitrary UDP multicast packet using GRE would be 32 bytes: 4 bytes (for the GRE header), plus 28 bytes (for the UDP/IP headers of the encapsulated packet). In contrast, UMTP adds an overhead of just 16 bytes (when carrying a SSM packet - it'd be 12 bytes for ISM). Furthermore, by making this a trailer, rather than a header, RTP/UDP/IP header compression - if applied - will continue to work on the entire packet. (The space savings could be significant if the UMTP packets traverses a low-bandwidth link...) (Also, the same 16-byte trailer turns out to be useful for sending control packets (in the reverse direction from data) - e.g., JOIN_GROUP (including periodic 'keep alive's) and LEAVE_GROUP messages.) Ross. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Sat Feb 24 06:54:05 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id GAA18667 for ; Sat, 24 Feb 2001 06:54:05 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id CAA18289 for ; Sat, 24 Feb 2001 02:07:44 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1OA7P110956 for ; Sat, 24 Feb 2001 02:07:25 -0800 (PST) Received: from dino-pc.procket.com (flowpoint.procket.com [205.253.146.41]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1OA7Li18168 for ; Sat, 24 Feb 2001 02:07:21 -0800 (PST) Received: (from dino@localhost) by dino-pc.procket.com (8.9.3/8.9.3) id CAA23507; Sat, 24 Feb 2001 02:07:19 -0800 Date: Sat, 24 Feb 2001 02:07:19 -0800 Message-Id: <200102241007.CAA23507@dino-pc.procket.com> X-Authentication-Warning: dino-pc.procket.com: dino set sender to dino@dino-pc.procket.com using -f From: Dino Farinacci To: finlayson@live.com CC: mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com In-reply-to: <4.3.1.1.20010223230702.00b3a360@localhost> (message from Ross Finlayson on Fri, 23 Feb 2001 23:35:15 -0800) Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM References: <4.3.1.1.20010223230702.00b3a360@localhost> >> From my understanding of GRE (please correct me if I'm wrong), the >> overhead to tunnel an arbitrary UDP multicast packet using GRE would be 32 >> bytes: 4 bytes (for the GRE header), plus 28 bytes (for the UDP/IP headers >> of the encapsulated packet). The overhead is an additional 24 bytes (20-byte fixed IP header and 4-byte GRE header). Dino From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Sat Feb 24 07:04:12 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id HAA18721 for ; Sat, 24 Feb 2001 07:04:11 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id CAA03738 for ; Sat, 24 Feb 2001 02:44:26 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1OAi6C14993 for ; Sat, 24 Feb 2001 02:44:06 -0800 (PST) Received: from ns.live.com (ns.live.com [208.184.148.162]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1OAi2M00026 for ; Sat, 24 Feb 2001 02:44:03 -0800 (PST) Received: (from rsf@localhost) by ns.live.com (8.9.3/8.9.3) id CAA03003; Sat, 24 Feb 2001 02:39:34 -0800 (PST) (envelope-from rsf) Message-Id: <4.3.1.1.20010224023311.00b3e400@localhost> X-Sender: rsf@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Sat, 24 Feb 2001 02:37:20 -0800 To: Dino Farinacci From: Ross Finlayson Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM Cc: mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com In-Reply-To: <200102241007.CAA23507@dino-pc.procket.com> References: <4.3.1.1.20010223230702.00b3a360@localhost> <4.3.1.1.20010223230702.00b3a360@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed At 02:07 AM 2/24/01, Dino Farinacci wrote: > >> From my understanding of GRE (please correct me if I'm wrong), the > >> overhead to tunnel an arbitrary UDP multicast packet using GRE would > be 32 > >> bytes: 4 bytes (for the GRE header), plus 28 bytes (for the UDP/IP > headers > >> of the encapsulated packet). > > The overhead is an additional 24 bytes (20-byte fixed IP header and > 4-byte > GRE header). But what about the UDP header of the packet that's being tunneled (i.e., the inner packet)? That's another 8 bytes. Wouldn't that go in the GRE packet as well? Ross. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Sat Feb 24 11:00:20 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id LAA20378 for ; Sat, 24 Feb 2001 11:00:19 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id GAA29347 for ; Sat, 24 Feb 2001 06:09:18 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1OE92307389 for ; Sat, 24 Feb 2001 06:09:02 -0800 (PST) Received: from cmr2.ash.ops.us.uu.net (cmr2.ash.ops.us.uu.net [198.5.241.40]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1OE8wO10459 for ; Sat, 24 Feb 2001 06:08:59 -0800 (PST) Received: from neserve0.corp.us.uu.net by cmr2.ash.ops.us.uu.net with ESMTP (peer crosschecked as: neserve0.corp.us.uu.net [153.39.92.148]) id QQkdto13134; Sat, 24 Feb 2001 14:08:00 GMT Received: by neserve0.corp.us.uu.net id QQkdto21086; Sat, 24 Feb 2001 09:07:42 -0500 (EST) From: jhall@UU.NET (Jeremy Hall) Message-Id: Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM In-Reply-To: <4.3.1.1.20010224023311.00b3e400@localhost> from Ross Finlayson at "Feb 24, 2001 02:37:20 am" To: Ross Finlayson Date: Sat, 24 Feb 2001 09:07:42 -0500 (EST) CC: Dino Farinacci , mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com X-Mailer: ELM [version 2.4ME+ PL60 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Maybe I'm missin somethin obvious, but why encapsulate the original packet inside a UDP packet and THEN inside a GRE packet? Wouldn't it make more sense to just encapsulate the original thing in a GRE packet? _J In the new year, Ross Finlayson wrote: > At 02:07 AM 2/24/01, Dino Farinacci wrote: > > >> From my understanding of GRE (please correct me if I'm wrong), the > > >> overhead to tunnel an arbitrary UDP multicast packet using GRE would > > be 32 > > >> bytes: 4 bytes (for the GRE header), plus 28 bytes (for the UDP/IP > > headers > > >> of the encapsulated packet). > > > > The overhead is an additional 24 bytes (20-byte fixed IP header and > > 4-byte > > GRE header). > > But what about the UDP header of the packet that's being tunneled (i.e., > the inner packet)? That's another 8 bytes. Wouldn't that go in the GRE > packet as well? > > Ross. > > From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Sat Feb 24 11:01:28 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id LAA20398 for ; Sat, 24 Feb 2001 11:01:28 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id GAA26993 for ; Sat, 24 Feb 2001 06:20:50 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1OEKle08896 for ; Sat, 24 Feb 2001 06:20:47 -0800 (PST) Received: from rip.psg.com (exim@rip.psg.com [147.28.0.39]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1OEKm017877 for ; Sat, 24 Feb 2001 06:20:48 -0800 (PST) Received: from randy by rip.psg.com with local (Exim 3.16 #1) id 14WfU6-000IB0-00; Sat, 24 Feb 2001 06:15:42 -0800 From: Randy Bush MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: Dino Farinacci Cc: finlayson@live.com, mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM References: <4.3.1.1.20010223230702.00b3a360@localhost> <200102241007.CAA23507@dino-pc.procket.com> Message-Id: Date: Sat, 24 Feb 2001 06:15:42 -0800 Content-Transfer-Encoding: 7bit premature optimization is the root of all evil -- tony hoare From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Sat Feb 24 11:05:39 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id LAA20415 for ; Sat, 24 Feb 2001 11:05:37 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id GAA02173 for ; Sat, 24 Feb 2001 06:25:37 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1OEPLr13090 for ; Sat, 24 Feb 2001 06:25:21 -0800 (PST) Received: from rip.psg.com (exim@rip.psg.com [147.28.0.39]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1OEPEr18260 for ; Sat, 24 Feb 2001 06:25:17 -0800 (PST) Received: from randy by rip.psg.com with local (Exim 3.16 #1) id 14WfdL-000IEo-00; Sat, 24 Feb 2001 06:25:15 -0800 From: Randy Bush MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: Dino Farinacci , finlayson@live.com, mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM References: <4.3.1.1.20010223230702.00b3a360@localhost> <200102241007.CAA23507@dino-pc.procket.com> Message-Id: Date: Sat, 24 Feb 2001 06:25:15 -0800 Content-Transfer-Encoding: 7bit > premature optimization is the root of all evil > -- tony hoare whoops! that may have been don knuth. randy From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Sat Feb 24 11:39:53 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id LAA20636 for ; Sat, 24 Feb 2001 11:39:53 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id HAA06055 for ; Sat, 24 Feb 2001 07:07:17 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1OF7M401830 for ; Sat, 24 Feb 2001 07:07:22 -0800 (PST) Received: from cmr1.ash.ops.us.uu.net (cmr1.ash.ops.us.uu.net [198.5.241.39]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1OF7Ar22415 for ; Sat, 24 Feb 2001 07:07:10 -0800 (PST) Received: from neserve0.corp.us.uu.net by cmr1.ash.ops.us.uu.net with ESMTP (peer crosschecked as: neserve0.corp.us.uu.net [153.39.92.148]) id QQkdts26351; Sat, 24 Feb 2001 15:06:12 GMT Received: by neserve0.corp.us.uu.net id QQkdts00461; Sat, 24 Feb 2001 10:06:10 -0500 (EST) From: jhall@UU.NET (Jeremy Hall) Message-Id: Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM In-Reply-To: <3A970302.927BE51F@info.vub.ac.be> from Pieter Liefooghe at "Feb 24, 2001 01:40:35 am" To: Pieter Liefooghe Date: Sat, 24 Feb 2001 10:06:10 -0500 (EST) CC: Jeremy Hall , Ross Finlayson , zaid , MBoned , SSM , Jason Schiller , Beth Vu , Juzer Kopti X-Mailer: ELM [version 2.4ME+ PL60 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit now THIS sounds interesting. marmaduke:~$ whois 208.197.171.112/28@radb.ra.net [whois.radb.net] route: 208.192.0.0/10 descr: UUNET, An MCI Worldcom Company 3060 Williams Drive Fairfax VA 22031 USA origin: AS701 mnt-by: MAINT-AS701 changed: juzer@uu.net 19990104 source: RADB marmaduke:~$ now if we could say: 208.192/10 points to UUNET's database server, then UUNET has a bit more control of who can use what tunnel server from its own space. but be careful, it isn't always easy to know where a person is based on IP address. The ISP might know how it allocates addresses, but it might not be willing to announce that to the world. There is probably something I am overlooking, but feel free to point it out. :) _J In the new year, Pieter Liefooghe wrote: > (Repost of my own message from feb. 23th 17:00 GMT+1, which never got > through to the list!? - if you receive it multiple times - sorry) > Ross et al., > > I think that a tunneling solution should be: > > 1. As generic as possible. > It should not be limited to SSM. From the moment we do have enough > people who have access to it, I really think that we will be seeing some > collaborative tools that do use IP multicast....One very nice > application could be: Multicast Napster. ;-) > 2. As transparent as possible. > An ideal solution should not require any modification to the network > infrastructure (Hey, why is IP Multicast so slow in being deployed !?). > And preferably, we don't want any modification to the applications; If > we have to wait till we have a new generation of tunnel enabled > applications we are going to wait a long time! > 3. The least intrusive as possible. > As noted, you cannot expect a router to SNOOP on every UDP packet! You > don't want to touch that Router that after several hours - and probably > days - is finally running PIM-SM & MSDP the way it should. ;-) > 4. Require No modification to the Multicast paradigm. > You can't expect the unicast and multicast topologies to be congruent, > IP multicast flows in the reverse direction as unicast, and in some > situations there is simply no such return path (cfr. Satellite links > etc.), but also peering agreements force ISPs and Carriers to have such > topologies. > > This is why I think the solution, I have been working on, is a more > reasonable attempt at the problem. > > Full details are available in a paper that was presented at the IEEE > Local Computer Network Conference in Tampa, FL November 2000 and which > is available for download from: http://telecom.vub.ac.be/LCN00.pdf > Note: Some things did change over the past couple of months as a result > of the ongoing development/research in this area! The attached paper > contains an error in the formula for the metric: it should use (Loss)/10 > and NOT (1-Loss)/10! > > But for those in a hurry, here is a little summary: > > 1. Deploy in the "IP Multicast cloud" several Application level (e.g. > UDP) Tunnel Servers (Or add a Tunnel Server Service to routers?) > Ideal places: ISPs who want to "try" IP multicast without too much > effort. > 2. Let these Tunnel Servers register themselves in a central Tunnel > Database server. The Registration Message contains information about the > Network(s) for which this server wants to act as tunnel server and the > country in which it is located. > This Tunnel Database will hence contain a list with the available Tunnel > Servers. > 3. An end-user uses a modified Session Directory application. (or uses a > new generation of multicast application where the tunneling is > integrated.) > This application is modified in such a way that whenever it detects > that there is no native IP multicast, it sends out a query message > towards the central Tunnel Database server. This (HTTP) query contains > the IP address of the client and the Country where the client is > located. At the Tunnel Database server we first perform a longest prefix > match between the Client IP address and the network address ranges > provided for each tunnel server. If such entries do exist, this yields > one or more tunnel servers located in the "Network" of the end-user. If > this is not the case, we locate all Tunnel servers in the Country of > that client. If there are no tunnel servers for that country, we try to > locate a server in the "Region" of the country. (e.g. End-user in > Belgium, but no Tunnel Server in Belgium would get a list of Tunnel > Servers in - lets say - France and Holland.) If we don't find such a > Tunnel Server in the region a default one is provided. (currently > Located in my lab ;-) ) > As a result of this query we get the addresses of one or more tunnel > servers. > 4. If we have multiple potential tunnel servers, we determine the "Best > Tunnel Server to use. > The Best Tunnel server is determined by using a "TCP-Friendly" > measurement of the Packet Loss, Delay and Throughput along the path > between the client and the potential Tunnel Server. We use these > parameters in a formula, which yields us a metric of the path between > the client and the server. (cfr.paper) > During the measurement we already tunnel between the client and a > randomly chosen Tunnel Server (or we use the previously used Tunnel > Server if this is again in the list). > The end-user is hence immediately "connected" to the Multicast > Network! > 5. After the measurement round we set up a tunnel towards the "Best" > tunnel server and we do a "session hand-over" between the "temporary" > tunnel and the final tunnel. > 6. If this is integrated in a Session Directory tool it is now possible > to launch any existing IP Multicast application without modification > because the session directory tool knows which multicast address/port > numbers will be used by the application and hence is capable of > triggering the tunneling of these sessions at launch time. All received > data is re-multicasted locally at the end-user. > > The protocol is based on UMTP (the protocol also used in the "New > Internet Draft on automatic (end-user) tunneling for SSM"), but > "enhanced" to allow dynamic tunneling through a firewall (cfr. paper). > Probably we will also need one or more extra fields to carry the Source > address in case of a SSM multicast session. > > The architecture described in the paper also contains a part about how > you can locate a SAP/SDP Proxy and how you can retrieve cached SDP > Session Announcements from it and also how you can use it as a remote > announcer of SDP Sessions. - But this is probably less interesting for > the mboned working group - > > zaid also made the remark that : " We (This > community) also have to consider the high probability that as a result > of this draft no (ISP) will deploy multicast natively ". > At least, with my solution you give all unicast end-users the > POSSIBILITY to access IP multicast content. The mere fact that they do > have this possibility will trigger Content Providers in sending out in > an IP multicast format. > Hence after some time - and with the right publicity and enough > interesting content - you will automatically have enough people who are > using it. If the deployment/management cost of Native IP multicast drops > below the cost of the "wasted" bandwidth, we will immediately see that > ISPs will start to deploy IP multicast natively! > Another nice thing about this solution is that it can be deployed > gradually, and this without modification to the Network infrastructure! > > A typical scenario could look like this: An ISP wants to differentiate > itself from all the others and starts to offer this "new" IP Multicast > service (for FREE..the money will come later from the saved bandwidth > when native IP multicast is deployed). > They can do this easily because they only need to enable IP multicast on > one router (Hey, they could even - at first - simply use a DVMRP > tunnel!). > They only deploy one (or more) Tunnel Database servers at that location. > All tunnel end-users of that ISP will - by the mere property of the > longest prefix match query in the Tunnel Database- start to use these > Tunnel Servers. The clients are automatically load balanced over the > "cluster" of tunnel servers. > > When an ISP sees an increased demand for tunnels, the ISP has two > options: Add an extra Tunnel Server or deploy native IP multicast! The > choice between these will be "influenced" by the ratio between the > deployment/management cost of IP multicast and the cost of the wasted > bandwidth. > > But probably people from the ISP community on these lists could give > their point of view on this deployment strategy? > > Ok, these are my ideas on this topic. I do hope people find it > interesting enough to discuss this any further.... If enough interest, I > even might consider coming to the next IETF meeting to present this. ;-) > > Bye, > > Pieter > -----Original Message----- > From: Ross Finlayson > To: mboned@network-services.uoregon.edu > > Cc: ssm-interest@external.cisco.com > Date: Thursday, February 22, 2001 10:11 PM > Subject: New Internet Draft on automatic (end-user) tunneling for SSM > > > I have just written (with Radia Perlman and Doron Rajwan) a new > Internet Draft: > > Accelerating the Deployment of Multicast Using Automatic > Tunneling > > > > Abstract > > Many Internet users currently cannot participate in wide-area IP > multicast sessions, because their first-hop routers (or beyond) do not > support IP multicast routing. We describe an application level > (UDP-based) tunneling mechanism that allows non-multicast-connected > users - with no modification to their operating systems - to > automatically receive a large class of multicast sessions, pending the > deployment of multicast in their upstream routers. > ----------- > > We'll be giving a presentation on this during the MBONED WG session at > the > Minneapolis IETF. The I-D should get announced shortly; in the > meantime, > you can find a copy online at . > > (I'm hoping that this will help break the logjam that has held back > the > widespread adoption of multicast...) > > Ross. > > > > -- > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Pieter Liefooghe > Research Assistant > Vrije Universiteit Brussel (INFO/TW) > Digital Telecom Dept. > Pleinlaan 2 > 1050 Brussel > BELGIUM > Tel: +32-2-629.29.77 > Fax: +32-2-629.28.70 > pieter@info.vub.ac.be > http://www.castguide.com > > Quote of the day: > > Any program that runs right is obsolete. > From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Sat Feb 24 12:13:19 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id MAA20798 for ; Sat, 24 Feb 2001 12:13:19 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id HAA10536 for ; Sat, 24 Feb 2001 07:31:42 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1OFVem22303 for ; Sat, 24 Feb 2001 07:31:40 -0800 (PST) Received: from red.juniper.net (red.juniper.net [207.17.136.137]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1OFVaO20844 for ; Sat, 24 Feb 2001 07:31:36 -0800 (PST) Received: from garnet.juniper.net (garnet.juniper.net [172.17.28.17]) by red.juniper.net (8.9.3/8.9.3) with ESMTP id HAA14125; Sat, 24 Feb 2001 07:26:34 -0800 (PST) Received: from garnet.juniper.net (localhost [127.0.0.1]) by garnet.juniper.net (8.9.3/8.9.3) with ESMTP id HAA54483; Sat, 24 Feb 2001 07:26:33 -0800 (PST) (envelope-from pusateri@garnet.juniper.net) Message-Id: <200102241526.HAA54483@garnet.juniper.net> To: Ross Finlayson cc: Dino Farinacci , mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com, pusateri@juniper.net Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM In-Reply-To: Message from Ross Finlayson of "Sat, 24 Feb 2001 02:37:20 PST." <4.3.1.1.20010224023311.00b3e400@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <54480.983028393.1@garnet.juniper.net> Date: Sat, 24 Feb 2001 07:26:33 -0800 From: Tom Pusateri In message <4.3.1.1.20010224023311.00b3e400@localhost> you write: >At 02:07 AM 2/24/01, Dino Farinacci wrote: >> >> From my understanding of GRE (please correct me if I'm wrong), the >> >> overhead to tunnel an arbitrary UDP multicast packet using GRE would >> be 32 >> >> bytes: 4 bytes (for the GRE header), plus 28 bytes (for the UDP/IP >> headers >> >> of the encapsulated packet). >> >> The overhead is an additional 24 bytes (20-byte fixed IP header and >> 4-byte >> GRE header). > >But what about the UDP header of the packet that's being tunneled (i.e., >the inner packet)? That's another 8 bytes. Wouldn't that go in the GRE >packet as well? > > Ross. I'm confused and possibly others are as well. The word encapsulate has a very specific meaning while the word tunnel does not. Encapuslate means "to enclose" which, when dicussing packets, should be interpreted to mean to add octets in front of, or add octets at the end, or both. But tunneling can be done in many ways including encapsulation, rewriting headers, adding source route options, etc. So when talking about overhead, please be more clear about exactly type of tunneling is going on. Ross suggested that UMTP's trailer is to allow normal RTP header compression. Looking at the UMTP spec, it is difficult to determine if the original IP headers are rewritten or not. I assume so since it looks like the old IP header info is stored in the trailer. This should not be called encapsulation if the headers are modified before the trailer is added, or at least the word rewrite should be used in conjunction with the word encapsulate. This is tunneling though. Dino's GRE mechanism is simply adding a new IP header and GRE header in front of the original IP header without modifying the original IP datagram. This is a true encapsulation. This is also a form of tunneling. A major advantage to encapsulation over option insertion or IP header rewriting is that routers already do this in existing hardware. Other tunneling mechanisms that use header rewriting or option insertion are more difficult or impossible to do in hardware causing them to be shifted to valuable general purpose CPUs. Some routing vendors will refuse to implement these schemes. I would request that Ross clarify draft-finlayson-umtp-05.txt about the use of encapsulation and header rewriting. GRE adds: 24 bytes (20 byte IP + 4 byte GRE header) IPIP adds: 20 bytes (20 byte IP) If UMTP rewrites the original header plus adds the trailer, it adds just the trailer which is 12 or 16 bytes. If UMTP encapsulates the original packet with IP and UDP and adds the trailer, it adds: 48 (20 byte IP + 8 byte UDP + 16 byte trailer) If UMTP strips the IP header, adds a new UDP header and a trailer, its adds 24 (8 + 16 byte trailer). A clarification on this would be great. Of all of these options, GRE or IPIP are simplest to implement in hardware which will give you the performance and scaling needed for large rollouts. Thanks, Tom From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Sat Feb 24 15:32:18 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id PAA22143 for ; Sat, 24 Feb 2001 15:32:17 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id LAA29025 for ; Sat, 24 Feb 2001 11:18:21 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1OJIEL20318 for ; Sat, 24 Feb 2001 11:18:14 -0800 (PST) Received: from ns.live.com (ns.live.com [208.184.148.162]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1OJIF020504 for ; Sat, 24 Feb 2001 11:18:15 -0800 (PST) Received: (from rsf@localhost) by ns.live.com (8.9.3/8.9.3) id LAA23086; Sat, 24 Feb 2001 11:13:11 -0800 (PST) (envelope-from rsf) Message-Id: <4.3.1.1.20010224094504.00b335f0@localhost> X-Sender: rsf@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Sat, 24 Feb 2001 11:13:09 -0800 To: Tom Pusateri From: Ross Finlayson Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM Cc: Dino Farinacci , mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com In-Reply-To: <200102241526.HAA54483@garnet.juniper.net> References: <4.3.1.1.20010224023311.00b3e400@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed At 07:26 AM 2/24/01, Tom Pusateri wrote: >But tunneling can be done in many ways including encapsulation, >rewriting headers, adding source route options, etc. > >So when talking about overhead, please be more clear about exactly >type of tunneling is going on. OK, fair enough. To recap: The 'tunneling' that we are talking about here is UDP multicast tunneled over UDP unicast - i.e., using a UDP unicast packet A to (somehow) carry the semantics of a UDP multicast packet B, so that the node that receives packet A can reconstruct (as appropriate) the semantics of B (for delivery to the end application). Once again, it's important to stress how important it is that the 'outer' packet be ordinary UDP (unicast) - because this allows every computer in the world to receive (a large class of) IP multicast sessions, without requiring that their users install a new networking stack, or worse, a new OS. If you have both a "router developer's hat" and an "application developer's hat", then you should wear the latter hat when thinking about UMTP, because it is simply a protocol originally designed for tunneling between agents that are capable of running as ordinary applications. A UMTP "DATA" packet is simply a UDP unicast packet, whose UDP payload contains two things: - the payload from the original UDP multicast packet, and - a 16-byte trailer that describes the semantics of the multicast packet, in particular: its destination group address, its SSM source address, and its intended destination UDP port. So, the overhead of UMTP - when tunneling a SSM packet - is exactly 16 bytes. (If desired, this could probably be reduced some more with a 'UMTP-light' that omits things (like the ttl field) that aren't necessary for the special case of router<->end-node tunneling.) >If UMTP rewrites the original header plus adds the trailer, >it adds just the trailer which is 12 or 16 bytes. That's correct (although - wearing an "application developer's hat" - I prefer not to think of it as 'rewriting the original header'). It's just taking the payload from the original UDP multicast packet, adding a (12 or 16-byte) trailer, then resending it in a new UDP unicast packet. People who wear "router developer's hats" are welcome to think of this another way if they prefer :-) >I would request that Ross clarify draft-finlayson-umtp-05.txt >about the use of encapsulation and header rewriting. Will do. It's clear that I've confused people by my (apparently incorrect) use of the term "encapsulation". My apologies; I'll fix this in future versions. >GRE adds: 24 bytes (20 byte IP + 4 byte GRE header) Except remember that our goal here is UDP(multicast)-over-UDP(unicast) tunneling. If you were to use GRE to encapsulate (using the term correctly this time :-) a UDP multicast packet within a UDP unicast packet, then this would add 32 bytes (20 byte IP + 8 byte UDP + 4 byte GRE header). >IPIP adds: 20 bytes (20 byte IP) I don't think IPIP is an option here, because the 'outer' packet needs to be UDP. >A clarification on this would be great. I hope this helps! (I'll also be giving a spiel on UMTP as part of the automatic tunneling presentation during MBONED in Minneapolis.) >Of all of these options, GRE or IPIP are simplest to implement in hardware >which will give you the performance and scaling needed for large rollouts. Right, although we also need to think about ease of deployment for end users, which seems to dictate the use of a UDP-based tunneling protocol, which would rule out IPIP. As for GRE (within UDP unicast): If routers can, indeed, implement this significantly more efficiently than UMTP "DATA" packets, and we don't mind the extra overhead (32 bytes for GRE versus 16 bytes for UMTP (or less for 'UMTP-light')), then I agree that we seriously consider using GRE instead. (Note, though, that UMTP 'control' packets - or something like them - would still be needed in the reverse direction - to signal 'joins' (plus periodic keep-alives) and 'leaves'.) I'm looking forward to getting more feedback from router folks about all this... Ross. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Sat Feb 24 15:51:20 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id PAA22271 for ; Sat, 24 Feb 2001 15:51:19 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id LAA28463 for ; Sat, 24 Feb 2001 11:37:55 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1OJbj409496 for ; Sat, 24 Feb 2001 11:37:45 -0800 (PST) Received: from red.juniper.net (red.juniper.net [207.17.136.137]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1OJbd022535 for ; Sat, 24 Feb 2001 11:37:39 -0800 (PST) Received: from garnet.juniper.net (garnet.juniper.net [172.17.28.17]) by red.juniper.net (8.9.3/8.9.3) with ESMTP id LAA19753; Sat, 24 Feb 2001 11:33:01 -0800 (PST) Received: from garnet.juniper.net (localhost [127.0.0.1]) by garnet.juniper.net (8.9.3/8.9.3) with ESMTP id LAA68418; Sat, 24 Feb 2001 11:33:01 -0800 (PST) (envelope-from pusateri@garnet.juniper.net) Message-Id: <200102241933.LAA68418@garnet.juniper.net> To: Ross Finlayson cc: Tom Pusateri , Dino Farinacci , mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com, pusateri@juniper.net Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM In-Reply-To: Message from Ross Finlayson of "Sat, 24 Feb 2001 11:13:09 PST." <4.3.1.1.20010224094504.00b335f0@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <68415.983043181.1@garnet.juniper.net> Date: Sat, 24 Feb 2001 11:33:01 -0800 From: Tom Pusateri In message <4.3.1.1.20010224094504.00b335f0@localhost> you write: >At 07:26 AM 2/24/01, Tom Pusateri wrote: > >>If UMTP rewrites the original header plus adds the trailer, >>it adds just the trailer which is 12 or 16 bytes. > >That's correct (although - wearing an "application developer's hat" - I >prefer not to think of it as 'rewriting the original header'). It's just >taking the payload from the original UDP multicast packet, adding a (12 or >16-byte) trailer, then resending it in a new UDP unicast packet. People >who wear "router developer's hats" are welcome to think of this another way >if they prefer :-) Got it. I guess I think of rewrite because a router won't forward these at the socket level but at the IP level. >>GRE adds: 24 bytes (20 byte IP + 4 byte GRE header) > >Except remember that our goal here is UDP(multicast)-over-UDP(unicast) >tunneling. If you were to use GRE to encapsulate (using the term correctly >this time :-) a UDP multicast packet within a UDP unicast packet, then this >would add 32 bytes (20 byte IP + 8 byte UDP + 4 byte GRE header). I think this is where things were confusing. There is no UDP associated with GRE. Its pure IP just like IPIP. >>Of all of these options, GRE or IPIP are simplest to implement in hardware >>which will give you the performance and scaling needed for large rollouts. > >Right, although we also need to think about ease of deployment for end >users, which seems to dictate the use of a UDP-based tunneling protocol, >which would rule out IPIP. > >As for GRE (within UDP unicast): If routers can, indeed, implement this >significantly more efficiently than UMTP "DATA" packets, and we don't mind >the extra overhead (32 bytes for GRE versus 16 bytes for UMTP (or less for >'UMTP-light')), then I agree that we seriously consider using GRE >instead. (Note, though, that UMTP 'control' packets - or something like >them - would still be needed in the reverse direction - to signal 'joins' >(plus periodic keep-alives) and 'leaves'.) There is no point using GRE with UDP. I forgot to include another posbbile encapsulation option which is IP/UDP. This adds 28 bytes (20 bytes IP + 8 bytes UDP) to the front of the packet and doesn't change the original IP datagram (header included). This would be my preference if UDP unicast is required. Thanks, Tom From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Sat Feb 24 17:39:46 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id RAA22907 for ; Sat, 24 Feb 2001 17:39:45 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id NAA27938 for ; Sat, 24 Feb 2001 13:45:28 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1OLjPU09921 for ; Sat, 24 Feb 2001 13:45:25 -0800 (PST) Received: from guppy.vub.ac.be (guppy.vub.ac.be [134.184.129.2]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1OLjKr02919 for ; Sat, 24 Feb 2001 13:45:20 -0800 (PST) Received: from info1.vub.ac.be (info1.vub.ac.be [134.184.1.1]) by guppy.vub.ac.be (8.9.1b+Sun/3.17.0.ap (guppy)) id WAA02578; Sat, 24 Feb 2001 22:43:05 +0100 (MET) for Received: from info.vub.ac.be by info1.vub.ac.be (SMI-8.6/SMI-SVR4-INFO-HUB-110196) id WAA10798; Sat, 24 Feb 2001 22:45:06 +0100 Message-ID: <3A982ACB.C5E04D00@info.vub.ac.be> Date: Sat, 24 Feb 2001 22:42:35 +0100 From: Pieter Liefooghe X-Mailer: Mozilla 4.7 [en] (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: Jeremy Hall , Ross Finlayson , zaid , MBoned , SSM , Jason Schiller , Beth Vu , Juzer Kopti Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Jeremy Hall wrote: > now THIS sounds interesting. Ah, thanks ;-) > marmaduke:~$ whois 208.197.171.112/28@radb.ra.net > [whois.radb.net] > route: 208.192.0.0/10 > descr: UUNET, An MCI Worldcom Company > 3060 Williams Drive > Fairfax > VA 22031 USA > origin: AS701 > mnt-by: MAINT-AS701 > changed: juzer@uu.net 19990104 > source: RADB > marmaduke:~$ > now if we could say: > > 208.192/10 points to UUNET's database server, then UUNET has a bit more > control of who can use what tunnel server from its own space. > but be careful, it isn't always easy to know where a person is based on IP > address. The ISP might know how it allocates addresses, but it might not > be willing to announce that to the world. There is probably something I > am overlooking, but feel free to point it out. :) The client application is manually configured with the country where the client is located. it is not infered from the location information in the DNS system! For the second part of your remark... are you alluding to situations where some NATs/Firewalls are being deployed at the ISP who could "mask" the real IP address? In the current status of the architecture, we use the source IP address of the HTTP query as parameter to the longest prefix match. In most Corporate and probably many ISP cases this will be the IP address of the Firewall (NAT) through which the HTTP query went. Hence, the query will yield ALL tunnel database servers available in the Corporate/ISP domain. As a result of the path characterization you will see that the "optimal" tunnel database server will be used. Although in an ISP with a large amount of Tunnel Servers this could mean a big amount of Path characterisation overhead! Maybe we need to think about an hierarchical system of tunnel database servers. Where you have a root Tunnel Database server who can perform a HTTP redirect towards a Tunnel database server located in the ISP domain (if one is available ofcourse otherwise we continue to work as before!). The nice thing about the redirection is that this redirected query remains within the ISP domain and that it will "reveal" its real internal IP address. This real IP address can then be used in the Tunnel Database query to better manage the distribution of clients over the ISP's topology. In very complex ISP architectures we could even deploy multiple "levels" of Tunnel Database servers. And it is clear that these "private" Tunnel Database servers register themselves dynamically with the central Tunnel Database server and that there is some form of keep-alive checking. This is my "quickly engineered" solution to the problem you raised....Is this any good? Thanks for the input, Pieter -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Pieter Liefooghe Research Assistant Vrije Universiteit Brussel (INFO/TW) Digital Telecom Dept. Pleinlaan 2 1050 Brussel BELGIUM Tel: +32-2-629.29.77 Fax: +32-2-629.28.70 pieter@info.vub.ac.be http://www.castguide.com Quote of the day: Any program that runs right is obsolete. From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Sun Feb 25 07:14:56 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id HAA08825 for ; Sun, 25 Feb 2001 07:14:56 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id DAA02228 for ; Sun, 25 Feb 2001 03:17:46 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1PBG1l12715 for ; Sun, 25 Feb 2001 03:16:01 -0800 (PST) Received: from bells.cs.ucl.ac.uk (bells.cs.ucl.ac.uk [128.16.5.31]) by proxy1.cisco.com (8.11.2/8.11.2) with SMTP id f1PBFnO26898 for ; Sun, 25 Feb 2001 03:15:49 -0800 (PST) Received: from sonic.cs.ucl.ac.uk by bells.cs.ucl.ac.uk with local SMTP id ; Sun, 25 Feb 2001 11:10:28 +0000 To: Pieter Liefooghe cc: Jeremy Hall , Ross Finlayson , zaid , MBoned , SSM , Jason Schiller , Beth Vu , Juzer Kopti , J.Crowcroft@cs.ucl.ac.uk Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM In-reply-to: Your message of "Sat, 24 Feb 2001 01:40:35 +0100." <3A970302.927BE51F@info.vub.ac.be> Date: Sun, 25 Feb 2001 11:10:27 +0000 Message-ID: <756.983099427@cs.ucl.ac.uk> From: Jon Crowcroft i like the handover stuff - i think this is what is missing fro mthe other auto-tunnel draft - we need to think about a) giving on tree routers a choice about which of them is the initial point of grafting a unicast user on b) letting them change their minds under load.... this work helps us think about this ! i sort of envisage a hybrid between traceroute and rsvp - basically, you send a tunnel request/join towards one of i) a known on tree router (configured) ii) the source (e.g. for ssm ) iii) the rp (pim sm) as it shoots by various routers that know about the s,g, they can respond or not, and can modify the inflight request to say so so that upstream possible tunnel brokers can act on that.... maybe? j. From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Sun Feb 25 22:10:58 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id WAA15661 for ; Sun, 25 Feb 2001 22:10:57 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id RAA23416 for ; Sun, 25 Feb 2001 17:52:10 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1Q1pqL03243 for ; Sun, 25 Feb 2001 17:52:02 -0800 (PST) Received: from cclab.chungnam.ac.kr (cclab.cs.chungnam.ac.kr [168.188.129.51]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1Q1pgh09934 for ; Sun, 25 Feb 2001 17:51:43 -0800 (PST) Received: from cclab.cnu.ac.kr (bach [168.188.129.55]) by cclab.chungnam.ac.kr (8.9.3/8.9.3) with ESMTP id KAA29296; Mon, 26 Feb 2001 10:46:39 +0900 (KST) Message-ID: <3A99B539.D928BF7C@cclab.cnu.ac.kr> Date: Mon, 26 Feb 2001 10:45:29 +0900 From: Sang-Ha Kim X-Mailer: Mozilla 4.72 [en] (Windows NT 5.0; I) X-Accept-Language: en MIME-Version: 1.0 To: ssm-interest@external.cisco.com, maddogs@ietf.org Subject: [SSM] Some comments on a New Internet draft. References: <3A967AF3.2C32A474@cclab.cnu.ac.kr> Content-Type: text/plain; charset=EUC-KR Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Sang-Ha Kim wrote: This is the second request for some comments of a new Internet draft T Hierarchical Scheme for Source-Specific Multicast Deployment Abstract: Source-Specific Multicast (SSM) has been proposed to overcome the deployment limitations of PIM-SM such as handling of well-known sources, access control, and address allocation. However, current SSM work seems to neglect some other deployment issues such as the construction of the shortest path tree especially in inter-domain. The routing table entries for constructing SSM tree proportionally increase depending on the number of sources and groups. That is, SSM will bring scalability issues like current Internet standard multicasts when it is applied to inter-domain or core networks. In order to allow SSM to be deployed on Internet core networks, hierarchical consideration should be additionally augmented into the SSM scheme. This document specifies a hierarchical scheme, which uses not only existing SSM scheme within intra-domain, but also an automatic tunneling between a source and a border gateway router in inter-domain. You can get a copy online at . Sang-Ha. From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Mon Feb 26 01:34:09 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id BAA21516 for ; Mon, 26 Feb 2001 01:34:08 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id VAA00169 for ; Sun, 25 Feb 2001 21:32:30 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1Q5WBo12415 for ; Sun, 25 Feb 2001 21:32:11 -0800 (PST) Received: from pec.etri.re.kr (pec.etri.re.kr [129.254.164.217]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1Q5W2a06171 for ; Sun, 25 Feb 2001 21:32:03 -0800 (PST) Received: from sjkoh (sjkoh.etri.re.kr [129.254.164.46]) by pec.etri.re.kr (8.10.0/8.10.0) with SMTP id f1Q5I8K25690; Mon, 26 Feb 2001 14:18:08 +0900 (KST) Message-ID: <001d01c09fb3$eac7d120$2ea4fe81@etri.re.kr> Reply-To: "Seok Joo Koh" From: "Seok Joo Koh" To: "Sang-Ha Kim" , , References: <3A967AF3.2C32A474@cclab.cnu.ac.kr> <3A99B539.D928BF7C@cclab.cnu.ac.kr> Subject: Re: [SSM] Some comments on a New Internet draft. Date: Mon, 26 Feb 2001 14:21:04 +0900 Organization: ETRI/PEC MIME-Version: 1.0 Content-Type: text/plain; charset="ks_c_5601-1987" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 Content-Transfer-Encoding: 7bit A very nice input for SSM deployment ! This material is interesting to me in that some inter-domain issues of SSM deployment are considered by way of interactions between SSM-capable and SSM non-capable networks. Some features in this work are considered reciprocally with 'Autotunneling' works (by Ross Finlayson). In particular, the tunneling between Master (end receiver) and Slave (SSM-router) by Finlayson may be used in a similar way for the tunneling between SSM source and Border Gateway Router by Kim. Anyway, both are purposed to enhance the SSM deployment, and hopefully can be incorporated. Cheers, Seok Joo Koh, ----- Original Message ----- From: "Sang-Ha Kim" To: ; Sent: Monday, February 26, 2001 10:45 AM Subject: [SSM] Some comments on a New Internet draft. > Sang-Ha Kim wrote: > > This is the second request for some comments of a new Internet draft > T > Hierarchical Scheme for Source-Specific Multicast Deployment > > > > Abstract: > Source-Specific Multicast (SSM) has been proposed to overcome the > deployment limitations of PIM-SM such as handling of well-known > sources, access control, and address allocation. However, current > SSM work seems to neglect some other deployment issues such as the > construction of the shortest path tree especially in inter-domain. > The routing table entries for constructing SSM tree proportionally > increase depending on the number of sources and groups. That is, > SSM will bring scalability issues like current Internet standard > multicasts when it is applied to inter-domain or core networks. In > order to allow SSM to be deployed on Internet core networks, > hierarchical consideration should be additionally augmented into > the SSM scheme. This document specifies a hierarchical scheme, > which uses not only existing SSM scheme within intra-domain, but > also an automatic tunneling between a source and a border gateway > router in inter-domain. > > You can get a copy online at > . > > Sang-Ha. From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Mon Feb 26 06:11:19 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id GAA03807 for ; Mon, 26 Feb 2001 06:11:19 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id CAA02509 for ; Mon, 26 Feb 2001 02:02:22 -0800 (PST) Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1Q8bM729675 for ; Mon, 26 Feb 2001 00:37:23 -0800 (PST) Received: from bells.cs.ucl.ac.uk (bells.cs.ucl.ac.uk [128.16.5.31]) by proxy3.cisco.com (8.11.2/8.11.2) with SMTP id f1Q8b6I01492 for ; Mon, 26 Feb 2001 00:37:07 -0800 (PST) Received: from hocus.cs.ucl.ac.uk by bells.cs.ucl.ac.uk with local SMTP id ; Mon, 26 Feb 2001 08:31:35 +0000 To: Jon Crowcroft cc: MBoned , SSM Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM In-reply-to: Your message of "Sun, 25 Feb 2001 11:10:27 GMT." <756.983099427@cs.ucl.ac.uk> Date: Mon, 26 Feb 2001 08:31:33 +0000 Message-ID: <778.983176293@cs.ucl.ac.uk> From: Jon Crowcroft so here's the scoop somewhere (in www, session advertisement, in skywriting, in DNS if we can close that discussion:-) a multicast address is advertised if its SSM or its PIM SM, then the RP or source are advertised so a non multicast receiver can find _A_ unicast (or if anycast RPs are used, even maybe an anycast, though i guess someone on anISP that doesnt allow end users multicast probably doesnt let them use other useful things too - hey, they probably are behind a nat too:-) anyhow, so rathwerthan something complex for the end user, lets propose this 1/ send a UMTP request to the source (if ssm) or RP (if PIM SM) p sort of same thing 2/ the source (or RP) propagates the request down the tree (by multicast, of course) 3/ the first on tree router that does IP to UDP tunnels says "OK/ACK", and propgstes this new message up the tree to say "i'm handling it" and down the tree too (deal with interdomain routers somewhere there somehow...) 4/ the on tree router handling it send s the unicast response to the user and starts forwarding data.... 5/ UMTP leaves are sent direct to this ontree router. Handovers: ontree router is now taking place of the SSM source (or RP) in the example above.....follow procedure again, but with a bit in the UMTP header to say "handover" .... Scope: might want to scope how far up and down a tree a handover can go.... Management:-) ontree UMTP capable routers may want to load balance - to this end, they need to exchange load information. easy. they can all do multicast. so i) we assign a new group/rp, or one of them is a source/distribution point. ii) we build an IP-multicast tree of on-data-tree UMTP-capable routers from the RP or "designated root" (actually, its a strict subtree of the data tree) iii) we map at the UMTP points on it, the additional branches and mark the UMTP degree (a single number, for each UMTP-capable router) this can be used to do some balancing if we want....(how to do balancing is subject for further study - for example, it aint obvious at all:-) now i know some Big Router Vendors might say that this is tricky to do in their boxes - but theres nothign to stop someone selling a streaming server that also peers via the IGP and then runs PIM, and then does this stuff..... if we don't like/support UMTP, then any other IPmc to unicast techniquee can also apply (fill in this form here:- [...] ) comments? In message <756.983099427@cs.ucl.ac.uk>, Jon Crowcroft typed: >> >>i like the handover stuff - i think this is what is missing fro mthe >>other auto-tunnel draft - we need to think about >>a) giving on tree routers a choice about which of them is the initial >>point of grafting a unicast user on >>b) letting them change their minds under load.... >> >>this work helps us think about this ! >> >>i sort of envisage a hybrid between traceroute and rsvp - basically, >>you send a tunnel request/join towards one of >>i) a known on tree router (configured) >>ii) the source (e.g. for ssm ) >>iii) the rp (pim sm) >> >>as it shoots by various routers that know about the s,g, they can >>respond or not, and can modify the inflight request to say so so that >>upstream possible tunnel brokers can act on that.... >> >>maybe? >> >>j. cheers jon From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Mon Feb 26 06:28:57 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id GAA04063 for ; Mon, 26 Feb 2001 06:28:57 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id CAA26970 for ; Mon, 26 Feb 2001 02:23:21 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1QAN5P25142 for ; Mon, 26 Feb 2001 02:23:05 -0800 (PST) Received: from davis.bandwiz.com ([212.150.220.34]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1QAMxh10782 for ; Mon, 26 Feb 2001 02:23:00 -0800 (PST) Received: by davis.bandwiz.com with Internet Mail Service (5.5.2653.19) id <167M441Y>; Mon, 26 Feb 2001 12:20:09 +0200 Message-ID: <288F58308EFBD411B896006008F5DCAA0494B8@davis.bandwiz.com> From: Doron Rajwan To: "'Ross Finlayson'" Cc: mboned@network-services.uoregon.edu, ssm-interest@external.cisco.com Subject: Reducing the UMTP 16 bytes overhead Date: Mon, 26 Feb 2001 12:20:08 +0200 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" Ross, I suggest to use UMTP-lite protocol, that will work only with SSM sessions. The overhead of this protocol can be reduced to 0 bytes! The current 16 UMTP bytes overhead contains: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | (IPv4) source address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | source cookie | destination cookie | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | (IPv4) multicast address | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | port | TTL |S|vers.|command| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ My suggestion is to use a directional tunnel, from the slave to the master, per (S,G), for SSM sessions. If you want to tunnel more than one group -- create more than one tunnel (you need the state anyway). In this case, you can remove the source address (S) and the multicast address (G). Also, I think that the cookies are redundant because there is no need to give greater protection than SSM; we can relay on the RPF checks. This leaves us with 4 bytes overhead. In order to remove those too, the port number should be fixed. It means, that if a multicast application sends data to the same (S,G), but to a different port, this data cannot be tunneled. The TTL field is set to zero, i.e., only the tunnel master computer. The S is always 1, The version is always 0, and the command is always DATA. The tunnel creation / destruction commands will be set to a well-known port on the slave. The benefit: 1. Simple protocol. 2. No IP fragmentation needed! Doron. -----Original Message----- From: Ross Finlayson [mailto:finlayson@live.com] Sent: Sunday, February 25, 2001 1:00 AM To: Doron Rajwan Cc: dino@procket.com; Radia Perlman (E-mail) Subject: RE: FW: New Internet Draft on automatic (end-user) tunneling for SSM At 11:37 AM 2/24/01, Doron Rajwan wrote: >Still, I think that you can discard the original IP / UDP headers: The >source IP (S) and the destination IP (G) are known to the receiver, because >they were given on the tunnel creation. But remember it's possible for *more than one multicast session* to be tunneled at the same time. I.e., the end node may have joined several different multicast groups, with several different SSM sources, and with different destination UDP ports (e.g. RTP,RTCP). When multicast data comes over the tunnel, the tunnel master (i.e., running on the end node) needs to know this information (which came from the original UDP/IP header) so that it can know which multicast session it belongs to. That's what the UMTP trailer is for. Now, one could argue for a simplification of UMTP in which the UMTP trailer - for "DATA" packets - doesn't need to carry all of this information in detail. Instead, the DATA packet could just carry some sort of 'token' that indicates which multicast session the data is for. This 'token' could be some random number that's chosen randomly by the tunnel master and included in the "JOIN_GROUP" message along with the (S,G,P) information. If this is done, then the full (S,G,P) information would be present only in the periodic JOIN_GROUP messages that are sent by the master, *not* in the (possibly far more frequent) DATA messages that come back from the slave. I think that this would be a useful change to make, and something to consider for 'UMTP-light'. (The reason why the current UMTP doesn't do this is that it allows for the possibility of DATA packets being sent across the tunnel for multicast sessions that were *not* explicitly requested by an earlier JOIN_GROUP. But for our purposes, that's not needed.) However, note that other, 'router type' people on the MBONED and SSM mailing lists are currently arguing in the opposite direction: They're arguing that - to simplify implementation in the router (the tunnel slave) - the DATA packets should contain the *whole* original UDP/IP header (a 28-byte overhead), rather than any simplified representation of this. I'm not sure how much I believe their arguments, but in order for this tunneling mechansm to get used, we need to get buy-in from router people. If that means putting up with some wasted overhead, then I can live with that... >The application will not put any de-multiplexing information in the port >numbers. No, there should be no need to impose *any* restriction on applications (other than that they use UDP). Ross. From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Tue Feb 27 04:38:36 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id EAA02222 for ; Tue, 27 Feb 2001 04:38:35 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id AAA03768 for ; Tue, 27 Feb 2001 00:17:20 -0800 (PST) From: Olivier.TESSIER@tcc.thomson-csf.com Received: from proxy3.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1R8GPH29931 for ; Tue, 27 Feb 2001 00:16:25 -0800 (PST) Received: from gw-smtp.thomson-csf.com (gwsmtp.thomson-csf.com [195.101.39.226]) by proxy3.cisco.com (8.11.2/8.11.2) with ESMTP id f1R8GHg02997 for ; Tue, 27 Feb 2001 00:16:18 -0800 (PST) Received: from thomplex.thomson-csf.com (200.3.2.2) by gw-smtp.thomson-csf.com (NPlex 5.1.053) id 3A9AC90E00004085 for ssm-interest@external.cisco.com; Tue, 27 Feb 2001 09:15:21 +0100 Received: from thomplex.thomson-csf.com (200.3.2.2) by thomplex.thomson-csf.com (NPlex 5.1.053) id 3A8A2FB7000E9A2F for ssm-interest@external.cisco.com; Tue, 27 Feb 2001 09:12:52 +0100 Received: from 200.3.1.11 by thomplex.thomson-csf.com (InterScan E-Mail VirusWall NT); Tue, 27 Feb 2001 09:12:51 +0100 (Paris, Madrid) Received: from nodaltcc.gnv.tcc.thomson-csf.com (2.200.15.12) by tccplex.tcc.thomson-csf.com (NPlex 5.1.053) id 3A9AF4D4000006A6 for ssm-interest@external.cisco.com; Tue, 27 Feb 2001 09:12:51 +0100 Received: by nodaltcc.gnv.tcc.thomson-csf.com with Internet Mail Service (5.5.2448.0) id ; Tue, 27 Feb 2001 09:12:51 +0100 Message-ID: <7DA02C9E5E48D4118FE60020484047C004316E@anubis.gnv.tcc.thomson-csf.com> To: ssm-interest@external.cisco.com Subject: Unsubscribe Date: Tue, 27 Feb 2001 09:12:48 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2448.0) Content-Type: text/plain; charset="iso-8859-1" unsubscribe ssm-interest olivier.tessier@tcc.thomson-csf.com From owner-extdom.ssm-interest@sj-msg-core-2.cisco.com Wed Feb 28 14:30:21 2001 Received: from sj-msg-core-2.cisco.com (sj-msg-core-2.cisco.com [171.69.43.88]) by ietf.org (8.9.1a/8.9.1a) with SMTP id OAA20118 for ; Wed, 28 Feb 2001 14:30:20 -0500 (EST) Received: from sj-msg-av-3.cisco.com (sj-msg-av-3.cisco.com [171.69.2.19]) by sj-msg-core-2.cisco.com (8.9.3/8.9.1) with ESMTP id KAA18581 for ; Wed, 28 Feb 2001 10:07:36 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-3.cisco.com (8.10.1/8.10.1) with ESMTP id f1SI7IP24327 for ; Wed, 28 Feb 2001 10:07:18 -0800 (PST) Received: from sky.irisa.fr (sky.irisa.fr [131.254.60.147]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1SI79a12362 for ; Wed, 28 Feb 2001 10:07:09 -0800 (PST) Received: from irisa.fr (rocha.irisa.fr [131.254.13.52]) by sky.irisa.fr (8.9.3/8.9.3) with ESMTP id SAA02528 for ; Wed, 28 Feb 2001 18:52:11 +0100 (MET) Message-ID: <3A9D3ACD.A7808477@irisa.fr> Date: Wed, 28 Feb 2001 18:52:13 +0100 From: Ali Boudani Organization: INRIA - RENNES X-Mailer: Mozilla 4.75 [en] (WinNT; U) X-Accept-Language: en, fr MIME-Version: 1.0 To: ssm-interest@external.cisco.com Subject: remarks- source specific multicast for IP Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Transfer-Encoding: 7bit Hello, just a few remarks 1- Elimination of cross-delivery of traffic when two sources simultaneously use the same source-specific destination address. The simultaneous use of an SSM destination address by multiple sources is explicitly supported. You are supposing that the delivery is done usually by shared tree?? but in all cases the use of ssm will not eliminate the cross-delivery because it is not a protocol matter more than topology matter?? isnt true? 2- the adding of SSM upgrades to the existing protocol hasnt any impact in scalability in building multicast trees?? 3- is the source address should be in teh range 232/8 also or it is just for the group ?? Thanx From owner-extdom.ssm-interest@sj-msg-core-1.cisco.com Wed Feb 28 14:59:36 2001 Received: from sj-msg-core-1.cisco.com (sj-msg-core-1.cisco.com [171.71.163.11]) by ietf.org (8.9.1a/8.9.1a) with SMTP id OAA21574 for ; Wed, 28 Feb 2001 14:59:36 -0500 (EST) Received: from holbrook-laptop.cisco.com (dhcp-10-34-3-21.cisco.com [10.34.3.21]) by sj-msg-core-1.cisco.com (8.9.3/8.9.1) with ESMTP id KAA00765; Wed, 28 Feb 2001 10:42:23 -0800 (PST) Received: by holbrook-laptop.cisco.com (Postfix, from userid 500) id B877AC3AC8; Wed, 28 Feb 2001 10:42:15 -0800 (PST) From: Hugh Holbrook To: Ali Boudani Cc: ssm-interest@external.cisco.com In-reply-to: <3A9D3ACD.A7808477@irisa.fr> Subject: Re: remarks- source specific multicast for IP Reply-To: holbrook@cisco.com Mime-Version: 1.0 (generated by tm-edit 1.7) Content-Type: text/plain; charset=US-ASCII Message-Id: <20010228184215.B877AC3AC8@holbrook-laptop.cisco.com> Date: Wed, 28 Feb 2001 10:42:15 -0800 (PST) > Date: Wed, 28 Feb 2001 18:52:13 +0100 > From: Ali Boudani > > Hello, > just a few remarks > 1- Elimination of cross-delivery of traffic when two sources > simultaneously use the same source-specific destination address. > The simultaneous use of an SSM destination address by multiple > sources is explicitly supported. > > You are supposing that the delivery is done usually by shared tree?? > but in all cases the use of ssm will not eliminate the cross-delivery > because it is not a protocol matter more than topology matter?? > isnt true? We're referring to the property that subscriptions are maintained independently per (S,G) -- (S1,G1) and (S2,G2) are routed independently, even if G1 and G2 are the same. This has nothing to do with topology -- it's a property of the service model. Shared trees are not used by SSM. > 2- the adding of SSM upgrades to the existing protocol hasnt any impact > in scalability in building multicast trees?? Not from any effect of making protocol changes to PIM-SM. The same mechanisms are used. SSM applies most naturally to broadcast-like sessions where there is a single natural source anyway, and there is no scalability impact for those sessions. If anything, the protocol costs go down a little bit for those apps because the overhead of going to the shared tree is eliminated. > 3- is the source address should be in teh range 232/8 also or it is just > for the group ?? No. Source addresses for SSM are normal IP host addresses. -Hugh From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Wed Feb 28 17:48:11 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id RAA29907 for ; Wed, 28 Feb 2001 17:48:11 -0500 (EST) Received: from sj-msg-av-2.cisco.com (sj-msg-av-2.cisco.com [171.71.163.110]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id NAA18752 for ; Wed, 28 Feb 2001 13:31:13 -0800 (PST) Received: from proxy1.cisco.com (localhost [127.0.0.1]) by sj-msg-av-2.cisco.com (8.10.1/8.10.1) with ESMTP id f1SLUok02098 for ; Wed, 28 Feb 2001 13:31:10 -0800 (PST) Received: from kinkajou.arc.nasa.gov (kinkajou.arc.nasa.gov [128.102.132.150]) by proxy1.cisco.com (8.11.2/8.11.2) with ESMTP id f1SLUea22354 for ; Wed, 28 Feb 2001 13:30:40 -0800 (PST) Received: from localhost (lamaster@localhost) by kinkajou.arc.nasa.gov (8.9.3+Sun/8.9.1) with ESMTP id NAA12750; Wed, 28 Feb 2001 13:17:00 -0800 (PST) X-Authentication-Warning: kinkajou.arc.nasa.gov: lamaster owned process doing -bs Date: Wed, 28 Feb 2001 13:17:00 -0800 (PST) From: Hugh LaMaster X-Sender: lamaster@kinkajou.arc.nasa.gov To: MBoned , SSM Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM In-Reply-To: <778.983176293@cs.ucl.ac.uk> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII On Mon, 26 Feb 2001, Jon Crowcroft wrote: > so a non multicast receiver can find _A_ unicast (or if anycast RPs > are used, even maybe an anycast, though i guess someone on anISP that > doesnt allow end users multicast probably doesnt let them use other > useful things too - hey, they probably are behind a nat too:-) And, once they discover all this tunnel traffic, they'll probably start filtering it. I'm guessing that the success of UMTP depends on "anISP" being slow on the uptake ;-) > anyhow, so rathwerthan something complex for the end user, lets > propose this The end-user still has to have a UMTP-enabled app, though, right? I think that will add complexity for the end user, not to mention the app developers. Do UMTP-enabled versions of, say, vic and vat exist today? Do existing apps offer automatic switchover (start with multicast, switch to UMTP if nothing happens?) How do they learn about available sources&groups? > Handovers: > > ontree router is now taking place of the SSM source (or RP) in the > example above.....follow procedure again, but with a bit in the UMTP > header to say "handover" .... : > ontree UMTP capable routers may want to load balance - to this end, > they need to exchange load information. easy. they can all do > multicast. so If you want any large transit providers to support this, I think handover/load-balancing would be key, and would have to work with an auxiliary router off to the side, for the following reason: I find it very unlikely that transit providers will want to support the tunnel replication on their core GSR/M40/whatever routers. So, I don't think it is worth doing unless the load-balancing/off-loading stuff is there from the beginning. Probably, a provider would want to provide the replication in an auxiliary router adjacent to an edge peering router. In real hardware terms, they might park a 7200-class router next to the peering GSR or M40 in order to support the tunnel replication. They would probably also control access very carefully so as not to carry tunnels over their backbones-- only provide for tunnels coming out to the local ISP. So, I'm picturing a tier-1 provider putting this adjacent to their peering router for "anISP", without any cooperation from "anISP", and thus, sending lots of streams out the interface to "anISP". This usage model could work, because, the Tier-1 provider could realize a (multicast-enabled) savings in their own backbone. I'm just wondering what "anISP" will do when it sees N tunnels coming in that interface. I'm also wondering about DoS (sometimes inadvertant, as we know) -- it is probably necessary for the peering router to switch-forward the tunnel requests to the helper box rather than having to process them locally in any way. Some of the new capabilities boxes have to forward traffic differently on the basis on IP header information, mostly developed to support web activities, might be usable for this. > this can be used to do some balancing if we want....(how to do > balancing is subject for further study - for example, it aint obvious > at all:-) > > now i know some Big Router Vendors might say that this is tricky to do > in their boxes - but theres nothign to stop someone selling a > streaming server that also peers via the IGP and then runs PIM, and > then does this stuff..... The problem is that all the fast core boxes are designed to separate forwarding decisions from route and other processing, and use some combination of distributed multi-CPU software forwarding and/or ASIC-etc enabled hardware switching. There is just no way to drive a bunch of today's OC-48's and OC-192's cost-effectively in a pure-software router. So, it is a big deal to ask the router operating system to catch all the packets of a certain type and process them in software, and it opens up the possibility of DoS, on-purpose, or perhaps accidentally. If the core router could dumbly forward all request packets to a nearby helper, I would think that would help a lot. > if we don't like/support UMTP, then any other IPmc to unicast > techniquee can also apply (fill in this form here:- [...] ) > > comments? UMTP seems like a lot of work to develop/debug/deploy. I think the same level of effort applied to deploying native multicast might bring more multicast users online. Has anybody attempted to survey the Tier-2/3 providers about what they think about UMTP multicast vs. native multicast? -- Hugh LaMaster, M/S 233-21, Email: lamaster@nas.nasa.gov NASA Ames Research Center Or: lamaster@nren.nasa.gov Moffett Field, CA 94035-1000 Or: lamaster@kinkajou.arc.nasa.gov Phone: 650/604-1056 Disc: Unofficial, personal *opinion*. From owner-extdom.ssm-interest@sj-msg-core-4.cisco.com Wed Feb 28 19:40:47 2001 Received: from sj-msg-core-4.cisco.com (sj-msg-core-4.cisco.com [171.71.163.10]) by ietf.org (8.9.1a/8.9.1a) with SMTP id TAA03477 for ; Wed, 28 Feb 2001 19:40:46 -0500 (EST) Received: from sj-msg-av-1.cisco.com (sj-msg-av-1.cisco.com [171.69.11.130]) by sj-msg-core-4.cisco.com (8.9.3/8.9.1) with ESMTP id PAA04759 for ; Wed, 28 Feb 2001 15:39:27 -0800 (PST) Received: from proxy2.cisco.com (localhost [127.0.0.1]) by sj-msg-av-1.cisco.com (8.10.1/8.10.1) with ESMTP id f1SNdYE10983 for ; Wed, 28 Feb 2001 15:39:34 -0800 (PST) Received: from ns.live.com (ns.live.com [208.184.148.162]) by proxy2.cisco.com (8.11.2/8.11.2) with ESMTP id f1SNdFb07733 for ; Wed, 28 Feb 2001 15:39:15 -0800 (PST) Received: (from rsf@localhost) by ns.live.com (8.9.3/8.9.3) id PAA33304; Wed, 28 Feb 2001 15:34:21 -0800 (PST) (envelope-from rsf) Message-Id: <4.3.1.1.20010228140122.00c0b9c0@localhost> X-Sender: rsf@localhost X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Wed, 28 Feb 2001 15:33:11 -0800 To: Hugh LaMaster From: Ross Finlayson Subject: Re: New Internet Draft on automatic (end-user) tunneling for SSM Cc: MBoned , SSM In-Reply-To: References: <778.983176293@cs.ucl.ac.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed At 01:17 PM 2/28/01, Hugh LaMaster wrote: >The end-user still has to have a UMTP-enabled app, though, right? One possible approach is for each multicast application to support UMTP (or whatever UDP-based tunneling protocol ends up being defined for automatic tunneling). Another possible approach is for the helper app, shell or plugin that *launches* the application to support this tunneling protocol. For example, if you launch your application from a SDP session browser, then this browser can perform the tunneling itself. The browser receives incoming tunneled traffic, and re-multicasts it locally (i.e., with TTL 0) where it can be received by existing multicast applications (without modifying them). For example, the "multikit" multicast session browser (available for free from ) already has a tunneling option, and several people have used this to tunnel multicast sessions over non-multicast-capable routers. (In this case, the tunneling isn't automatic; instead, the user has to explicitly specify a UMTP 'slave' (e.g., a liveGate server) that's located on a separate, multicast-enabled network.) >Do UMTP-enabled versions of, say, vic and vat exist today? No, although - as noted above - they can (& do) work without change by having the launcher tool do the tunneling. >Do existing apps offer automatic switchover (start >with multicast, switch to UMTP if nothing happens?) No, although "multikit" sort of does the reverse: It lets the user start up a (non-automatic) tunnel explicitly, but turns it off if it detects that it's not necessary. In practice, I don't think that deploying application support for multicast tunneling is going to be a significant hurdle. The most widely deployed media players (e.g., RealPlayer and Windows Media Player) already have mechanisms for automatically downloading new plugins on demand. (Ditto for web browser plugins.) Just as long as we don't require *OS* upgrades... In contrast, the biggest hurdle is going to be to persuade the router vendors to bundle tunneling slave support with their PIM-SSM implementations. >So, it is a big deal to ask the router >operating system to catch all the packets of a certain type and >process them in software, and it opens up the possibility of DoS, >on-purpose, or perhaps accidentally. If the core router could >dumbly forward all request packets to a nearby helper, I would >think that would help a lot. Agreed. Router vendor buy-in is (obviously) essential here, and the tunneling protocol should be designed with ease of router support in mind. (For example, we've already heard some feedback that it's easier for routers to send tunneled multicast packets to the end nodes using encapsulation (IP/UDP) rather than header rewriting+adding a trailer (which is what UMTP's "DATA" command does now). One possibly useful way to proceed now would be to break the problem up into three parts: 1/ The UDP-based *signalling* protocol that end nodes (tunnel 'masters') would use to join (with periodic keep-alives) and leave multicast groups. This could be something similar to UMTP's "JOIN_GROUP" and "LEAVE_GROUP" commands. 2/ The UDP-based *data delivery* protocol that tunnel 'slaves' (ideally, compliant routers) would use to deliver multicast data to the end nodes. (This might just be a simple encapsulation protocol.) 3/ One or more possible 'router behaviors' that would implement automatic tunneling. The current draft talks about one such 'behavior': "Upstream router interception". This seems like the simplest behavior to support, but one could imagine extending it to support things like more complicated hand-off, etc... The key point here is that we can define the end-user signalling and delivery protocols (1/ and 2/) for automatic tunneling, while leaving room for some flexibility as to how routers actually implement this (i.e., 3/). >UMTP seems like a lot of work to develop/debug/deploy. I think >the same level of effort applied to deploying native multicast >might bring more multicast users online. Perhaps, but its effort that would be applied in different places. There's nothing to prevent us from attacking both fronts; in fact, there are good reasons why we should do this. There are lots and lots of legacy first-hop routers out in the Internet that don't support native multicast. They are never going to get upgraded to support multicast unless we provide some incentive. The availability of UDP-tunneled multicast (which allows all of these users to experience multicast sessions ASAP) can provide such an incentive, by creating demand for the deployment of native support (to improve performance). "Build it, and they will come" :-) Ross.