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Date: Mon, 1 Dec 2003 16:26:05 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
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Subject: [Mip4] WG adoption call on
 draft-patel-mobileip-experimental-messages-02.txt
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    This is a call to assess the support in the workgroup for adoption
of "draft-patel-mobileip-experimental-messages-02.txt" as a workgroup
document with the purpose of standardising experimental messages,
extensions and error codes for MIP v4. 

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-patel-mobileip-experimental-messages-02.txt

If you have no comments on the draft at this time, and supports its
adoption, simply respond with a line containing something like

 "I support the adoption of this document as a workgroup document"


If you have no comments on the draft at this time, but *don't* supports
its adoption, simply respond with a line containing something like

 "I don't support the adoption of this document as a workgroup document"


If you have comments, please use a line like one of the two quoted
above, and supplement this with your comments.


	Regards,

		Henrik



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From: "Espen Klovning" <espen@birdstep.com>
To: "Henrik Levkowetz" <henrik@levkowetz.com>, <mip4@ietf.org>
References: <20031201162605.12c02305.henrik@levkowetz.com>
Subject: Re: [Mip4] WG adoption call on draft-patel-mobileip-experimental-messages-02.txt
Date: Mon, 1 Dec 2003 13:19:04 -0500
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"I support the adoption of this document as a workgroup document"

We need a better system to handle experimental messages/codes. Recent
experiences with repeated renumbering have been annoying. The current draft
is an attempt to handle that. My only concern is that the subtype allocation
needs some thought to avoid the same problem all over again.

espen
Espen Klovning
Birdstep Technology ASA


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Date: Mon, 01 Dec 2003 21:14:10 +0200 (EET)
From: sami.vaarala@iki.fi
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Subject: [Mip4] Comments on draft-ietf-dhc-mipadvert-opt-01.txt
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Hi,

A late response to the poll on the list:

Overall: I support the acceptance of this document, it seems to
provide a useful mechanism that may be relevant in more complicated
foreign agent scenarios (e.g. multi-provider environment).

On the details, a few comments:

   - If possible, the duplication of agent advertisement format
     from RFC 3344 to this document should be avoided, as it
     introduces a dependency and does not make it clear is the
     format updated if the corresponding ICMP format is updated
     (although the flags field is discussed separately, but
     other changes to the format may at least theoretically
     happen :-).

     One concrete suggestion for Section 3.3:

       - Specify the extension as having exactly one agent
         advertisement (for simplicity, personal preference),
         the extension beginning with Mobility Agent IP Address.

       - Keep the extension format otherwise as-is, but
         instead of re-specifying the extension, refer to
         RFC 3344 Section 2.1.1.  Expand the current flags
         discussion to cover other fields of the advertisement
         as well.

   - An alternative would be to provide the MN with only the
     FA IP addresses, but this does not seem to work well with
     ICMP router solicitation (the router is allowed to answer
     with multicast which might confuse other MNs in the
     network).  Was this alternative considered (and rejected) ?

   - Nit: RFC 3220 references should be changed to RFC 3344 references.

Best regards,

-Sami
-- 
Sami Vaarala
Senior System Architect
Netseal  (http://www.netseal.com)

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From: "Espen Klovning" <espen@birdstep.com>
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Cc: "Henrik Levkowetz" <henrik@levkowetz.com>
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Subject: [Mip4] Comments on draft-ietf-dhc-mipadvert-opt-01.txt
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Another late response to the poll on the list:

As Sami pointed out, the mechanism discussed in this draft has merit in =
more complicated foreign agent scenarios. I support such a mechanism.

Apart from all the other comments I have seen regarding this draft, I am =
still left with a few questions/comments. Any clarification will be =
appreciated.

1) I agree with Sami that a duplication of the existing agent =
advertisement format is not necessarily a good thing. Mostly because =
ICMP advertisements include more information than just the Mobility =
Agent Advertisment Extension, e.g. MAC addresses, ICMP Code fields, =
Prefix Length. The current extension is a good starting point though.

2) How is the MN supposed to use this mechanism? As far as I can tell, =
it is not mentioned at all. It might be intentional for all I know. So, =
should the MN:

A) Use the DHCP Mobility Agent Announcement directly without soliciting =
for an agent.
B) Solicit for agents but only accept the one(s) indicated in the =
Mobility Agent Announcement when the DHCP operation is completed.

There seems to be some issues with both approaches when the FA is not =
co-located but a separate physical entity.
Will the authentication implied by the draft still be useful? How will =
the MN get the necessary MAC address? Will the MN know whether the FA =
performs generic routing services or not?=20

regards
espen=20
Espen Klovning
Birdstep Technology ASA





------=_NextPart_000_0081_01C3B83D.5BA3E790
Content-Type: text/html;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2800.1276" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Another late response to the poll on =
the=20
list:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>As Sami pointed out, the mechanism =
discussed in=20
this draft has merit in more complicated foreign agent scenarios.&nbsp;I =
support=20
such a mechanism.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Apart from all the other comments I =
have seen=20
regarding this draft, I am still left with a&nbsp;few =
questions/comments. Any=20
clarification will be appreciated.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2><FONT face=3DArial size=3D2>1) I agree =
with Sami that=20
a&nbsp;duplication of the existing agent advertisement format is not =
necessarily=20
a good thing.&nbsp;Mostly because ICMP advertisements include more =
information=20
than just the Mobility Agent Advertisment Extension, e.g.&nbsp;MAC =
addresses,=20
ICMP Code fields, Prefix Length. The current extension is a good =
starting point=20
though.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>2) How is the&nbsp;MN supposed to use this mechanism? As far as I =
can tell,=20
it is not mentioned at all. It might be intentional for all I =
know.&nbsp;So,=20
should the MN:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>A) Use the DHCP Mobility Agent =
Announcement=20
directly without soliciting for an agent.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>B) Solicit for agents but =
only&nbsp;accept the=20
one(s) indicated in the Mobility Agent Announcement&nbsp;when the DHCP =
operation=20
is completed.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>There&nbsp;seems to be&nbsp;some =
issues&nbsp;with=20
both approaches&nbsp;when the FA is not co-located but a separate =
physical=20
entity.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Will the authentication implied by the =
draft still=20
be useful? How will the MN get the necessary MAC address? Will the MN =
know=20
whether the FA performs generic routing services or not? </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>regards</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>espen </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Espen Klovning</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Birdstep Technology ASA</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV></BODY></HTML>

------=_NextPart_000_0081_01C3B83D.5BA3E790--


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Subject:  [Mip4] WG adoption call on draft-patel-mobileip-experimental-messages-02.txt
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"I support the adoption of this document as a workgroup document"

I have the same concerns as Espen regarding the subtype allocation
though.

BR,
Farid

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Date: Mon, 01 Dec 2003 22:25:28 -0800
From: Yoshiyuki Tsuda <yoshiyuki.tsuda@toshiba.co.jp>
Subject: Re: [Mip4] WG adoption call on draft-patel-mobileip-experimental-messages-02.txt
To: Henrik Levkowetz <henrik@levkowetz.com>
Cc: mip4@ietf.org
Organization: Corporate R&D Center, Toshiba Corporation
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 "I support the adoption of this document as a workgroup document"

I think, this I-D is quite useful, because:
- it will provide a way to do some MIP message experiments by MIP
  standard-based devices.
- It enables those vendors which don't have any specific vendor IDs
  to do some MIP extension experiments.

Thanks.
-Yoshi

Yoshiyuki Tsuda
Corporate R&D Center, Toshiba Corporation

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From: Henrik Levkowetz <henrik@levkowetz.com>
To: "Espen Klovning" <espen@birdstep.com>
Cc: <mip4@ietf.org>
Subject: Re: [Mip4] WG adoption call on 
 draft-patel-mobileip-experimental-messages-02.txt
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Monday  1 December 2003, Espen wrote:
> We need a better system to handle experimental messages/codes. Recent
> experiences with repeated renumbering have been annoying. The current draft
> is an attempt to handle that. My only concern is that the subtype allocation
> needs some thought to avoid the same problem all over again.

That's a good point. So maybe we should predefine one or two numbers out of
all mip v4 subtype ranges as experimental for that subtype, too?

	Henrik

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Date: Tue, 2 Dec 2003 18:25:14 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: "Espen Klovning" <espen@birdstep.com>
Cc: <mip4@ietf.org>
Subject: Re: [Mip4] Comments on draft-ietf-dhc-mipadvert-opt-01.txt
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Hi Espen,

	Thanks for the response. Some replies inline:

Monday  1 December 2003, Espen wrote:
> Another late response to the poll on the list:
> 
> As Sami pointed out, the mechanism discussed in this draft has merit
> in more complicated foreign agent scenarios. I support such a
> mechanism.
> 
> Apart from all the other comments I have seen regarding this draft, I
> am still left with a few questions/comments. Any clarification will be
> appreciated.
> 
> 1) I agree with Sami that a duplication of the existing agent
> advertisement format is not necessarily a good thing. Mostly because
> ICMP advertisements include more information than just the Mobility
> Agent Advertisment Extension, e.g. MAC addresses, ICMP Code fields,
> Prefix Length. The current extension is a good starting point though.

Ok. This seems to parallel some comments received earlier; I'll propose
some new text to make it possible to indicate fields as inactive.

> 2) How is the MN supposed to use this mechanism? As far as I can tell,
> it is not mentioned at all. It might be intentional for all I know.
> So, should the MN:
> 
> A) Use the DHCP Mobility Agent Announcement directly without
> soliciting for an agent. B) Solicit for agents but only accept the
> one(s) indicated in the Mobility Agent Announcement when the DHCP
> operation is completed.

Not describing this was intentional; it would really be up to vendors and
deployers. But the most straightforward way would be for a mobile arriving
at for instance a WiFi hotspot to acquire a dhcp address and solicit for
FAs in parallel. To differentiate between possible services, the FAs would
be announced only through DHCP, not by responding to router solicitations;
this way the FA and service level offered could be dependent on the NAI
provided by the MN. 

> There seems to be some issues with both approaches when the FA is not
> co-located but a separate physical entity. Will the authentication
> implied by the draft still be useful? How will the MN get the
> necessary MAC address? Will the MN know whether the FA performs
> generic routing services or not? 

As for the authentication, this will be as feasible or not as the
corresponding key distribution problem, I guess.

Given the IP address, the MN should be able to ARP for the MAC address.
That's at least the way I thought about it.

To know what node(s) provides generic routing services, you'd need to
provide the router(s) by DHCP, too, using the router option.

I guess all of this should go into the updated draft :-)

	Regards,
		Henrik



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Subject: Re: [Mip4] WG adoption call on  draft-patel-mobileip-experimental-messages-02.txt
References: <20031201162605.12c02305.henrik@levkowetz.com>	<002801c3b837$9ab0dca0$bae3fea9@espenlapxp> <20031202173908.44ab7d81.henrik@levkowetz.com>
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Agreed. Probably, we can reserve a number in higher range - 254 or 255 as
experimental for all extensions defined in "Long Extension Format" as
specified in 1.10 of RFC 3344?

-a

Henrik Levkowetz wrote:

>Monday  1 December 2003, Espen wrote:
>  
>
>>We need a better system to handle experimental messages/codes. Recent
>>experiences with repeated renumbering have been annoying. The current draft
>>is an attempt to handle that. My only concern is that the subtype allocation
>>needs some thought to avoid the same problem all over again.
>>    
>>
>
>That's a good point. So maybe we should predefine one or two numbers out of
>all mip v4 subtype ranges as experimental for that subtype, too?
>
>	Henrik
>
>  
>



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From: Henrik Levkowetz <henrik@levkowetz.com>
To: Alpesh <alpesh@cisco.com>
Cc: Espen Klovning <espen@birdstep.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on 
 draft-patel-mobileip-experimental-messages-02.txt
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Hi Alpesh,

Tuesday  2 December 2003, Alpesh wrote:
> Agreed. Probably, we can reserve a number in higher range - 254 or 255 as
> experimental for all extensions defined in "Long Extension Format" as
> specified in 1.10 of RFC 3344?

Any reason to limit this to subtypes of the long extension format,
rather than applying it to all extensions which define subtypes?

	Henrik

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Henrik -

No specific reason - just forgot to confirm that the short extension format
defined in section 1.11 of rfc3344 also defines sub-types. We can reserve
a number there as well.

There are too many experimental elements in the title (already
3 and this potential 4th). Maybe we can just have the title changed to
*-experimental-elements-* ??

Thanks for pointing it out.
-a

Henrik Levkowetz wrote:

>Hi Alpesh,
>
>Tuesday  2 December 2003, Alpesh wrote:
>  
>
>>Agreed. Probably, we can reserve a number in higher range - 254 or 255 as
>>experimental for all extensions defined in "Long Extension Format" as
>>specified in 1.10 of RFC 3344?
>>    
>>
>
>Any reason to limit this to subtypes of the long extension format,
>rather than applying it to all extensions which define subtypes?
>
>	Henrik
>  
>



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From: Henrik Levkowetz <henrik@levkowetz.com>
To: Alpesh <alpesh@cisco.com>
Cc: Espen Klovning <espen@birdstep.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on 
 draft-patel-mobileip-experimental-messages-02.txt
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Tuesday  2 December 2003, Alpesh wrote:
> No specific reason - just forgot to confirm that the short extension format
> defined in section 1.11 of rfc3344 also defines sub-types. We can reserve
> a number there as well.

Ok. Maybe even better might be to say that any extensions with
sub-type numbers, such as for instance extensions according to
rfc 3344 section 1.10 and 1.11, have sub-type number so-and-so
reserved as experimental?

> There are too many experimental elements in the title (already
> 3 and this potential 4th). Maybe we can just have the title changed to
> *-experimental-elements-* ??

What about "Experimental Numbers for Mobile IPv4" ?

	Henrik

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Henrik -

Okay, we will add a new section with the text to keep a specific sub-type
number reserved for current and future extensions.

Thx
-a

Henrik Levkowetz wrote:

>Tuesday  2 December 2003, Alpesh wrote:
>  
>
>>No specific reason - just forgot to confirm that the short extension format
>>defined in section 1.11 of rfc3344 also defines sub-types. We can reserve
>>a number there as well.
>>    
>>
>
>Ok. Maybe even better might be to say that any extensions with
>sub-type numbers, such as for instance extensions according to
>rfc 3344 section 1.10 and 1.11, have sub-type number so-and-so
>reserved as experimental?
>
>  
>
>>There are too many experimental elements in the title (already
>>3 and this potential 4th). Maybe we can just have the title changed to
>>*-experimental-elements-* ??
>>    
>>
>
>What about "Experimental Numbers for Mobile IPv4" ?
>
>	Henrik
>  
>



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        Espen Klovning <espen@birdstep.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on  draft-patel-mobileip-experimental-messages-02.txt
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I think we should be careful here; I don't see a good way to define
the term "subtype" unless we are referring to the specific extension
formats identified in RFC 3344 (long and short).  So I would hope you
can be explicit about the subtype fields instead of making a statement
like:

 > >any extensions with
 > >sub-type numbers, such as for instance extensions according to
 > >rfc 3344 section 1.10 and 1.11, have sub-type number so-and-so
 > >reserved as experimental?

-Pete

Alpesh writes:
 > Henrik -
 > 
 > Okay, we will add a new section with the text to keep a specific sub-type
 > number reserved for current and future extensions.
 > 
 > Thx
 > -a
 > 
 > Henrik Levkowetz wrote:
 > 
 > >Tuesday  2 December 2003, Alpesh wrote:
 > >  
 > >
 > >>No specific reason - just forgot to confirm that the short extension format
 > >>defined in section 1.11 of rfc3344 also defines sub-types. We can reserve
 > >>a number there as well.
 > >>    
 > >>
 > >
 > >Ok. Maybe even better might be to say that any extensions with
 > >sub-type numbers, such as for instance extensions according to
 > >rfc 3344 section 1.10 and 1.11, have sub-type number so-and-so
 > >reserved as experimental?
 > >
 > >  
 > >
 > >>There are too many experimental elements in the title (already
 > >>3 and this potential 4th). Maybe we can just have the title changed to
 > >>*-experimental-elements-* ??
 > >>    
 > >>
 > >
 > >What about "Experimental Numbers for Mobile IPv4" ?
 > >
 > >	Henrik
 > >  
 > >
 > 
 > 
 > 
 > -- 
 > Mip4 mailing list
 > Mip4@ietf.org
 > https://www.ietf.org/mailman/listinfo/mip4


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Date: Tue, 2 Dec 2003 21:07:17 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: Pete McCann <mccap@lucent.com>
Cc: Alpesh <alpesh@cisco.com>, Espen Klovning <espen@birdstep.com>,
        mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on 
 draft-patel-mobileip-experimental-messages-02.txt
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Tuesday  2 December 2003, Pete wrote:

> I think we should be careful here; I don't see a good way to define
> the term "subtype" unless we are referring to the specific extension
> formats identified in RFC 3344 (long and short).  So I would hope you
> can be explicit about the subtype fields instead of making a statement
> like:
> 
>  > >any extensions with
>  > >sub-type numbers, such as for instance extensions according to
>  > >rfc 3344 section 1.10 and 1.11, have sub-type number so-and-so
>  > >reserved as experimental?

Seems you're a bit more cautious than me here, but I can go with this,
too.

	Best,
		Henrik


	

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To: mip4@ietf.org
Subject: [Mip4] draft-ietf-dhc-mipadvert-opt-01.txt
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One more late comment on this draft (I don't have an opinion at this
time on whether it should be advanced):

Is it required that all mobility agents configured by this option be
on-link?  That seems to be implied by text like the following:

>   H
>      Home agent.  This agent offers service as a home agent on the link
>      on which this mobility agent announcement is sent.
>
>   F
>      Foreign agent.  This agent offers service as a foreign agent on
>      the link on which this mobility agent announcement is sent.

But is it really necessary?  For example, you should be able to
configure a home agent that is on a remote link, right?  Then your
DHCP-configured address could be used like a co-located CoA for a MIP
registration, and you could keep the HA for subsequent handoffs.

This might be a good way to, for example, configure an HA in the local
network while roaming, but when you haven't deployed Mobile IP FAs,
and you want to centralize the HAs on links other than the access
links.

I assume this sort of functionality would be supported by the existing
Mobile IP Home Agent option specified in RFC 2132.

-Pete


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From: Henrik Levkowetz <henrik@levkowetz.com>
To: Pete McCann <mccap@lucent.com>
Cc: mip4@ietf.org
Subject: Re: [Mip4] draft-ietf-dhc-mipadvert-opt-01.txt
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Hi Pete

Tuesday  2 December 2003, Pete wrote:

> One more late comment on this draft (I don't have an opinion at this
> time on whether it should be advanced):

Ok

> Is it required that all mobility agents configured by this option be
> on-link?  That seems to be implied by text like the following:
>
> >   H
> >      Home agent.  This agent offers service as a home agent on the link
> >      on which this mobility agent announcement is sent.
> >
> >   F
> >      Foreign agent.  This agent offers service as a foreign agent on
> >      the link on which this mobility agent announcement is sent.
> 
> But is it really necessary?  For example, you should be able to
> configure a home agent that is on a remote link, right?  Then your
> DHCP-configured address could be used like a co-located CoA for a MIP
> registration, and you could keep the HA for subsequent handoffs.

Yes. Quite right.  The text implies it, but unnecessarily. 

> This might be a good way to, for example, configure an HA in the local
> network while roaming, but when you haven't deployed Mobile IP FAs,
> and you want to centralize the HAs on links other than the access
> links.

Not sure I see exactly what you mean here. Are you thinking in terms
of virtual home networks / never-at-home mobiles?

> I assume this sort of functionality would be supported by the existing
> Mobile IP Home Agent option specified in RFC 2132.

Yes; if you only want to configure an HA the Home Agent option should
be sufficient. 

I originally wrote a draft defining only an FA option, (as that's what
we needed) but as the numbers of fields grew, and I included almost all
of the regular advertisement fields, I thought I might just as well make
it general. Also, as the number of available dhcp option codes are quite
limited, I thought I'd define this as a more general option with
sub-options so as to make room for possible future mobility-related
options without depleting the option space further.

	Henrik

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Hi, Henrik,

Henrik Levkowetz writes:
 > > This might be a good way to, for example, configure an HA in the local
 > > network while roaming, but when you haven't deployed Mobile IP FAs,
 > > and you want to centralize the HAs on links other than the access
 > > links.
 > 
 > Not sure I see exactly what you mean here. Are you thinking in terms
 > of virtual home networks / never-at-home mobiles?

That's a possible use case but not the only one.  MNs wouldn't be
prevented from going home, it is just that when they initially attach
to the network and start a session, they may not be on the same link
as the one on which the operator has deployed HAs.  The HAs would be
in the same network (same administrative domain) but could be on
another link.  If that link does not provide access, then the MNs
would never go home.

 > > I assume this sort of functionality would be supported by the existing
 > > Mobile IP Home Agent option specified in RFC 2132.
 > 
 > Yes; if you only want to configure an HA the Home Agent option should
 > be sufficient. 

Ok.

 > I originally wrote a draft defining only an FA option, (as that's what
 > we needed) but as the numbers of fields grew, and I included almost all
 > of the regular advertisement fields, I thought I might just as well make
 > it general.

Yeah, that's the impression I got while reading it.

 > Also, as the number of available dhcp option codes are quite
 > limited, I thought I'd define this as a more general option with
 > sub-options so as to make room for possible future mobility-related
 > options without depleting the option space further.

Ok, but maybe the language describing the H bit (at least) should be
touched up a bit.

-Pete


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Date: Wed, 3 Dec 2003 00:17:05 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: Pete McCann <mccap@lucent.com>
Cc: mip4@ietf.org
Subject: Re: [Mip4] draft-ietf-dhc-mipadvert-opt-01.txt
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Hi Pete,

Tuesday  2 December 2003, Pete wrote:
> Henrik Levkowetz writes:
>  > > This might be a good way to, for example, configure an HA in the local
>  > > network while roaming, but when you haven't deployed Mobile IP FAs,
>  > > and you want to centralize the HAs on links other than the access
>  > > links.
>  > 
>  > Not sure I see exactly what you mean here. Are you thinking in terms
>  > of virtual home networks / never-at-home mobiles?
> 
> That's a possible use case but not the only one.  MNs wouldn't be
> prevented from going home, it is just that when they initially attach
> to the network and start a session, they may not be on the same link
> as the one on which the operator has deployed HAs.  The HAs would be
> in the same network (same administrative domain) but could be on
> another link.  If that link does not provide access, then the MNs
> would never go home.

Ok, so you're here thinking of the dhcp assignment of HA as a
provisioning mechanism, I guess. In combination with the dynamic HA
assignment draft it would be a way of provisioning the first HA to
contact (now called the Requested HA in that draft), for instance.

>  > > I assume this sort of functionality would be supported by the existing
>  > > Mobile IP Home Agent option specified in RFC 2132.
>  > 
>  > Yes; if you only want to configure an HA the Home Agent option should
>  > be sufficient. 
> 
> Ok.
> 
>  > I originally wrote a draft defining only an FA option, (as that's what
>  > we needed) but as the numbers of fields grew, and I included almost all
>  > of the regular advertisement fields, I thought I might just as well make
>  > it general.
> 
> Yeah, that's the impression I got while reading it.

Right :-)

>  > Also, as the number of available dhcp option codes are quite
>  > limited, I thought I'd define this as a more general option with
>  > sub-options so as to make room for possible future mobility-related
>  > options without depleting the option space further.
> 
> Ok, but maybe the language describing the H bit (at least) should be
> touched up a bit.

Yes, I'll take care of that.

	Henrik

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Subject: RE: [Mip4] WG adoption call on draft-patel-mobileip-experimental-
	messages-02.txt
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 "I support the adoption of this document as a workgroup document"

For what is worth I am also in favour of this work. I would also like to
remind people that this is about accepting the draft as a WG item...if that
is done I am sure we can figure out the details :-)

George

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        This is an advance notification, in order for you to have some
time to read through the draft mentioned in the subject line:

In one week, on Wednesday December 10th, we will ask for the workgroup's
viewpoint on making this draft a workgroup item, with the purpose of
standardising extensions to dynamically allocate an HA at the time of
registration, rather than statically preconfigured, in accordance with
workgroup charter item 4.

The draft is 21 pages long.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-kulkarni-mobileip-dynamic-assignment-02.txt

	Regards,
		Henrik and Pete



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Date: Wed, 3 Dec 2003 18:31:11 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
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Subject: Re: [Mip4] WG adoption call on 
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<chair hat off>

>  "I support the adoption of this document as a workgroup document"

I can see the use for this document, and supports its adoption.

Having experimental numbers makes sense to me, and I especially
hope it will help avoid extension number collisions in the future.

Thanks Alpesh and Kent for writing this up.

	Henrik

</chair hat off>

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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Mobility for IPv4 Working Group of the IETF.

	Title		: Mobile IPv4 Extension for AAA Network Access Identifiers
	Author(s)	: F. Johansson, T. Johansson
	Filename	: draft-ietf-mip4-aaa-nai-01.txt
	Pages		: 10
	Date		: 2003-12-3
	
When a mobile node moves between two foreign networks it has to be
reauthenticated.  If the home network has multiple Authentication
Authorization and Accounting (AAA) servers the reauthentication
request may not be received by the same Home AAA server as previous
authentication requests.  In order for the new Home AAA server to be
able to forward the request to the correct Home Agent it has to know
the identity of the Home Agent.  This document defines a Mobile IP
extension that enables the HA to pass its identity to the mobile node
which can then pass it on to the new AAA server when changing point
of attachment.

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http://www.ietf.org/internet-drafts/draft-ietf-mip4-aaa-nai-01.txt

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Reminder: The paper submission deadline is December 11, 2003, 
only a week away!!!

======================================================================

CALL FOR PAPERS

The Fifth ACM International Symposium on Mobile Ad Hoc
Networking and Computing 
MobiHoc 2004
www.sigmobile.org/mobihoc/2004/

May 24-26, 2004
Tokyo, Japan

MobiHoc 2004 is the fifth of a series of annual meetings sponsored by
ACM SIGMOBILE, focusing on the latest research in the rapidly growing
area of mobile ad hoc networking and computing. The first MobiHoc was
held in 2000 in Boston, Massachusetts, as a workshop affiliated with
the MobiCom conference also sponsored by SIGMOBILE. Since then, MobiHoc
has become a separate symposium, held in 2001 at Long Beach, 
California, in 2002 at Lausanne, Switzerland, in 2003 at Annapolis,
Maryland, and now in 2004 at Tokyo, Japan.

PAPERS:

Technical papers describing original, previously unpublished research,
not currently under review by another conference or journal, are
solicited. In general this symposium is interested in papers that
address networking or computing problems in the context of mobile and
wireless ad hoc networks, ad hoc computing systems, and sensor
networks, with the focus being on issues above the physical layer.
Specific topics of interest include the following:

* Routing protocols (unicast, multicast, geocast, content-based, etc.)
* Media access techniques
* Transport-layer issues
* Hardware and software platforms, systems, and testbeds
* Applications for ad hoc networks
* Power-aware, low-power, and energy-efficient designs
* Quality-of-service issues
* Security and fault tolerance issues
* Self-configuration in ad hoc networks
* Processing and fusion of data in sensor networks
* Location discovery and management
* Timing synchronization
* Distributed algorithms for ad hoc networks
* Biologically inspired mechanisms
* Ad hoc networks of autonomous intelligent systems
* Analytic methods and modeling for performance evaluation
* Cross-layer interactions, including between higher and physical layers
* Other ad hoc networking and computing topics above the physical layer

Please consult the program co-chairs Charlie Perkins
<charles.perkins@nokia.com> and Leandros Tassiulas <leandros@uth.gr> if
you are uncertain whether your paper falls within the scope of the
symposium.

SUBMISSION INSTRUCTIONS:

All submissions will be handled electronically and must be in PDF or
PostScript format. Papers must not exceed 15 pages (US "Letter" size,
8.5 x 11 inches) including text, figures and references. The font size
must be at least 10 points. Accepted papers will be published in the
symposium proceedings.

We will adopt a double-blind process for paper review, where the
identities of the authors are withheld from the reviewers. Authors'
names and their affiliations must not be revealed or mentioned anywhere
in the paper or in the PDF or PostScript file. Submitted papers should
describe original research, not published and not currently under review
for any other conference or journal. Papers not following these
guidelines will be summarily rejected.

To submit a paper, please refer to the paper submission link at the
conference website, www.sigmobile.org/mobihoc/2004/. Questions about the
submission process should be directed to the Program Co-Chairs.

TUTORIALS:

Proposals for tutorials are solicited. Evaluation of proposals will be
based on the expertise and experience of the instructors, and on the
relevance of the subject matter for the symposium. Potential
instructors are requested to submit a tutorial proposal of at most 5
pages, including a biographical sketch, to the Tutorial Chair,
Maria Papadopouli <maria@cs.unc.edu> by the paper submission deadline
below.


IMPORTANT DATES:

Paper Submission Deadline           December 11, 2003
Notification of Acceptance          March 10, 2004
Camera-ready version Due            March 25, 2004

Please visit the MobiHoc 2004 Home Page at
www.sigmobile.org/mobihoc/2004/,
or send email to the General Chair, Jun Murai
<jun-mobihoc2004@wide.ad.jp> or to <mobihoc2004@isrmail.isr.umd.edu> for
any questions or for more information about the symposium.




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Looking back over the responses received to date, it looks like we
have seen several voices in favor of adopting this item and not a
single WG member has spoken up in opposition.  So, I think it's fair
to say that a consensus exists for adopting this item.

There was some constructive discussion around the addition of an
experimental subtype code, which I think can be handled in due course
by the working group.  Alpesh, go ahead and submit the current version
as draft-ietf-mip4-experimental-messages-00.txt.

-Pete



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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Mobility for IPv4 Working Group of the IETF.

	Title		: Experimental Message, Extension and Error Codes for Mobile IPv4
	Author(s)	: A. Patel
	Filename	: draft-ietf-mip4-experimental-messages-00.txt
	Pages		: 9
	Date		: 2003-12-9
	
Mobile IPv4 message types range from 0 to 255. This document 
reserves a message type for use by an individual, company, or 
organization for experimental purpose, to evaluate enhancements 
to Mobile IPv4 messages before formal standards proposal. 
        
Mobile IPv4 defines a general Extension mechanism to allow 
optional  information  to  be  carried  by  Mobile  IP  control 
messages. Extensions are not skippable, if defined in range [0-
127]  and  skippable,  if  defined  in  range  [128-255].  This 
document reserves extension types in both the skippable and 
non-skippable range for experimental use.  
        
Also, Mobile IPv4 defines error codes for use by FA [64-127] 
and HA [128-192]. This document reserves an error code in both 
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From exim@www1.ietf.org  Wed Dec 10 17:31:31 2003
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Date: Wed, 10 Dec 2003 23:30:44 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: mip4@ietf.org
Cc: Pete McCann <mccap@lucent.com>
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    This is a call to assess the support in the workgroup for adoption
of "draft-kulkarni-mobileip-dynamic-assignment-02.txt" as a workgroup
document with the purpose of standardising extensions to dynamically
allocate an HA at the time of registration, rather than statically
preconfigured, in accordance with workgroup charter item 4.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-kulkarni-mobileip-dynamic-assignment-02.txt

If you have no comments on the draft at this time, and supports its
adoption, simply respond with a line containing something like

 "I support the adoption of this document as a workgroup document"


If you have no comments on the draft at this time, but *don't* supports
its adoption, simply respond with a line containing something like

 "I don't support the adoption of this document as a workgroup document"


If you have comments, please use a line like one of the two quoted
above, and supplement this with your comments.


	Regards,

		Henrik

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From exim@www1.ietf.org  Wed Dec 10 17:33:28 2003
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Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-assignment-02.txt
Date: Wed, 10 Dec 2003 16:32:10 -0600
Message-ID: <697DAA22C5004B4596E033803A7CEF44024DBB54@daebe007.americas.nokia.com>
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I support the adoption of this document as a WG doc.

-Basavaraj

>=20
>=20
>     This is a call to assess the support in the workgroup for adoption
> of "draft-kulkarni-mobileip-dynamic-assignment-02.txt" as a workgroup
> document with the purpose of standardising extensions to dynamically
> allocate an HA at the time of registration, rather than statically
> preconfigured, in accordance with workgroup charter item 4.
>=20
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-kulkarni-mobileip-dy
namic-assignment-02.txt

If you have no comments on the draft at this time, and supports its
adoption, simply respond with a line containing something like

 "I support the adoption of this document as a workgroup document"


If you have no comments on the draft at this time, but *don't* supports
its adoption, simply respond with a line containing something like

 "I don't support the adoption of this document as a workgroup document"


If you have comments, please use a line like one of the two quoted
above, and supplement this with your comments.


	Regards,

		Henrik

--=20
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From exim@www1.ietf.org  Thu Dec 11 04:03:38 2003
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Date: Thu, 11 Dec 2003 00:01:45 -0800
From: Yoshiyuki Tsuda <yoshiyuki.tsuda@toshiba.co.jp>
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-assignment-02.txt
To: Henrik Levkowetz <henrik@levkowetz.com>
Cc: mip4@ietf.org
Organization: Corporate R&D Center, Toshiba Corporation
In-Reply-To: <20031210233044.69e3e853.henrik@levkowetz.com>
References: <20031210233044.69e3e853.henrik@levkowetz.com>
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"I support the adoption of this document as a workgroup document"

Thanks.
-Yoshi

Yoshiyuki Tsuda
Corporate R&D Center, Toshiba Corporation


at Wed, 10 Dec 2003 23:30:44 +0100 Henrik Levkowetz wrote:
>    This is a call to assess the support in the workgroup for adoption
>of "draft-kulkarni-mobileip-dynamic-assignment-02.txt" as a workgroup
>document with the purpose of standardising extensions to dynamically
>allocate an HA at the time of registration, rather than statically
>preconfigured, in accordance with workgroup charter item 4.
>
>A URL for this Internet-Draft is:
>http://www.ietf.org/internet-drafts/draft-kulkarni-mobileip-dynamic-assignment-02.txt
>
>If you have no comments on the draft at this time, and supports its
>adoption, simply respond with a line containing something like
>
> "I support the adoption of this document as a workgroup document"
>
>
>If you have no comments on the draft at this time, but *don't* supports
>its adoption, simply respond with a line containing something like
>
> "I don't support the adoption of this document as a workgroup document"
>
>
>If you have comments, please use a line like one of the two quoted
>above, and supplement this with your comments.
>
>
>	Regards,
>
>		Henrik
>
>-- 
>Mip4 mailing list
>Mip4@ietf.org
>https://www.ietf.org/mailman/listinfo/mip4

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Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-assignment-02.txt
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"I support the adoption of this document as a workgroup document"

espen 
Espen Klovning
Birdstep Technology

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From: Tsirtsis George <G.Tsirtsis@flarion.com>
To: "'Henrik Levkowetz'" <henrik@levkowetz.com>, mip4@ietf.org
Cc: Pete McCann <mccap@lucent.com>
Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
	signment-02.txt
Date: Thu, 11 Dec 2003 06:26:41 -0500
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 "I support the adoption of this document as a workgroup document"


A little bit more thought should be put into redirection from one assigned
HA to another. This is the case where a MN is registered with HAx and
potentially has active sessions based on the assigned HoAx. Based on section
4.2.2, HAx may for example detect that the MN is moving too far away from
HAx and closer to HAy. HAx can then reject the next RREQ from the MN with a
REDIRECTED-HA-ADDRESS Extension pointing to HAy. According to the current
text the MN has now no choice but dropping HoAx (and all its associated
sessions) to register with HAy which should provide HoAy. This will cause
sessions to drop for the benefit of optimizing routing...not ideal IMO. 

One way to avoid this is to introduce a flag that specifies the redirection
as optional or compulsory. If it is optional the MN should be able to stay
with HAx for a while longer (e.g.: until current sessions stop and MN is
idle). This may also require the REDIRECTED-HA-ADDRESS Extension (with
flag=optional) to be attached to positive RREP rather than rejections. If,
however, flag=compulsory (due to policy or other reasons) then the MN will
have to register with HAy immediately per current draft and
REDIRECTED-HA-ADDRESS Extensions will be attached to a reject RREP. 

Thoughts?

Finally, I think the draft would benefit from some clarification about how
dynamic/static HoA allocation is affected by HA redirection. When HA
redirection is used for load balancing (i.e.: all HAs are likely to be able
to handle all HoA prefixes) MNs with static HoAs may be redirect. This can
not be done if the HA redirection is used to provide a local HA to the MN in
which case the assigned HAs are not likely to support all the HoA prefixes.

Regards
George

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Date: Thu, 11 Dec 2003 15:40:22 -0800
To: Tsirtsis George <G.Tsirtsis@flarion.com>
From: Kent Leung <kleung@cisco.com>
Subject: RE: [Mip4] WG adoption call on
  draft-kulkarni-mobileip-dynamic-as signment-02.txt
Cc: "'Henrik Levkowetz'" <henrik@levkowetz.com>, mip4@ietf.org,
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At 06:26 AM 12/11/2003 -0500, Tsirtsis George wrote:


>  "I support the adoption of this document as a workgroup document"
>
>
>A little bit more thought should be put into redirection from one assigned
>HA to another. This is the case where a MN is registered with HAx and
>potentially has active sessions based on the assigned HoAx. Based on section
>4.2.2, HAx may for example detect that the MN is moving too far away from
>HAx and closer to HAy. HAx can then reject the next RREQ from the MN with a
>REDIRECTED-HA-ADDRESS Extension pointing to HAy. According to the current
>text the MN has now no choice but dropping HoAx (and all its associated
>sessions) to register with HAy which should provide HoAy. This will cause
>sessions to drop for the benefit of optimizing routing...not ideal IMO.


Right.  The assumption is that the MN is intelligent enough to decide 
exactly when
to re-anchor with a new HA (such as in idle state).  While MN has an active
session, it needs to maintain HoAx by setting the HA Address field to HAx
and not AZOA.


>One way to avoid this is to introduce a flag that specifies the redirection
>as optional or compulsory. If it is optional the MN should be able to stay
>with HAx for a while longer (e.g.: until current sessions stop and MN is
>idle). This may also require the REDIRECTED-HA-ADDRESS Extension (with
>flag=optional) to be attached to positive RREP rather than rejections. If,
>however, flag=compulsory (due to policy or other reasons) then the MN will
>have to register with HAy immediately per current draft and
>REDIRECTED-HA-ADDRESS Extensions will be attached to a reject RREP.
>
>Thoughts?

Redirection is optional or compulsory based on the HA address field being 
set to
HAx or AZOA.  If MN wants to stay with HAx until the active session
terminates, then the HA address field is set to HAx.  If MN don't care which HA
is being used, and want optimal routing, then AZOA should be used in RRQ.

Does this satisfy your needs?


>Finally, I think the draft would benefit from some clarification about how
>dynamic/static HoA allocation is affected by HA redirection. When HA
>redirection is used for load balancing (i.e.: all HAs are likely to be able
>to handle all HoA prefixes) MNs with static HoAs may be redirect. This can
>not be done if the HA redirection is used to provide a local HA to the MN in
>which case the assigned HAs are not likely to support all the HoA prefixes.


Right, we should add more content on this topic.  My take on this is that for
RRQs with static HoAs, the HoA field provides indication to the entity that's
doing redirection to reach the proper HA (one that has the HoA subnet).

Kent


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From: Naveen Paulkandasamy <naveenpk@cisco.com>
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To: Henrik Levkowetz <henrik@levkowetz.com>
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Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-assignment-02.txt
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  "I support the adoption of this document as a workgroup document"

-naveen.

Henrik Levkowetz wrote:
> 
>     This is a call to assess the support in the workgroup for adoption
> of "draft-kulkarni-mobileip-dynamic-assignment-02.txt" as a workgroup
> document with the purpose of standardising extensions to dynamically
> allocate an HA at the time of registration, rather than statically
> preconfigured, in accordance with workgroup charter item 4.
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-kulkarni-mobileip-dynamic-assignment-02.txt
> 
> If you have no comments on the draft at this time, and supports its
> adoption, simply respond with a line containing something like
> 
>  "I support the adoption of this document as a workgroup document"
> 
> 
> If you have no comments on the draft at this time, but *don't* supports
> its adoption, simply respond with a line containing something like
> 
>  "I don't support the adoption of this document as a workgroup document"
> 
> 
> If you have comments, please use a line like one of the two quoted
> above, and supplement this with your comments.
> 
> 
> 	Regards,
> 
> 		Henrik
> 



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From: Tsirtsis George <G.Tsirtsis@flarion.com>
To: "'Kent Leung'" <kleung@cisco.com>
Cc: mip4@ietf.org
Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
	 signment-02.txt
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Inline...

-----Original Message-----
From: Kent Leung [mailto:kleung@cisco.com]
Sent: Thursday, December 11, 2003 11:40 PM
To: Tsirtsis George
Cc: 'Henrik Levkowetz'; mip4@ietf.org; Pete McCann
Subject: RE: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-as signment-02.txt


At 06:26 AM 12/11/2003 -0500, Tsirtsis George wrote:


>  "I support the adoption of this document as a workgroup document"
>
>
>A little bit more thought should be put into redirection from one assigned
>HA to another. This is the case where a MN is registered with HAx and
>potentially has active sessions based on the assigned HoAx. Based on
section
>4.2.2, HAx may for example detect that the MN is moving too far away from
>HAx and closer to HAy. HAx can then reject the next RREQ from the MN with a
>REDIRECTED-HA-ADDRESS Extension pointing to HAy. According to the current
>text the MN has now no choice but dropping HoAx (and all its associated
>sessions) to register with HAy which should provide HoAy. This will cause
>sessions to drop for the benefit of optimizing routing...not ideal IMO.


Right.  The assumption is that the MN is intelligent enough to decide 
exactly when
to re-anchor with a new HA (such as in idle state).  While MN has an active
session, it needs to maintain HoAx by setting the HA Address field to HAx
and not AZOA.

GT> Section 4.2.2 does not seem to say this. Instead, it says that the RREQ
sent by the MN may have HA = (ALL-ZERO-ONE-ADDR  OR unicast address)....see
packet format in step 1&2. In EITHER case the HA is able to reject and
redirect (step 3).

>One way to avoid this is to introduce a flag that specifies the redirection
>as optional or compulsory. If it is optional the MN should be able to stay
>with HAx for a while longer (e.g.: until current sessions stop and MN is
>idle). This may also require the REDIRECTED-HA-ADDRESS Extension (with
>flag=optional) to be attached to positive RREP rather than rejections. If,
>however, flag=compulsory (due to policy or other reasons) then the MN will
>have to register with HAy immediately per current draft and
>REDIRECTED-HA-ADDRESS Extensions will be attached to a reject RREP.
>
>Thoughts?

Redirection is optional or compulsory based on the HA address field being 
set to
HAx or AZOA.  If MN wants to stay with HAx until the active session
terminates, then the HA address field is set to HAx.  If MN don't care which
HA
is being used, and want optimal routing, then AZOA should be used in RRQ.

Does this satisfy your needs?

GT> Almost. Maybe both things should be possible. If the MN wants to
optimize routing then it should be able to send an ALL-ZERO-ONE-ADDR to the
HA. This assumes that the MN has some understanding of the topology which
may be true in some cases. In other cases, however, it might be the HA that
has understanding of the topology, in which case the HA should be able to
send either:
- a *positive* RREP with an *optional* REDIRECTED-HA-ADDRESS extension OR 
- a *negative* RREP with a *compulsory* REDIRECTED-HA-ADDRESS extension.


>Finally, I think the draft would benefit from some clarification about how
>dynamic/static HoA allocation is affected by HA redirection. When HA
>redirection is used for load balancing (i.e.: all HAs are likely to be able
>to handle all HoA prefixes) MNs with static HoAs may be redirect. This can
>not be done if the HA redirection is used to provide a local HA to the MN
in
>which case the assigned HAs are not likely to support all the HoA prefixes.


Right, we should add more content on this topic.  My take on this is that
for
RRQs with static HoAs, the HoA field provides indication to the entity
that's
doing redirection to reach the proper HA (one that has the HoA subnet).

GT> Agreed.

Thanks
George

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Date: Fri, 12 Dec 2003 12:13:15 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: Tsirtsis George <G.Tsirtsis@flarion.com>
Cc: "'Kent Leung'" <kleung@cisco.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
 signment-02.txt
Message-Id: <20031212121315.11dfa27b.henrik@levkowetz.com>
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George, Kent,

My impression of what this draft sets out to do is to provide a mechanism
for dynamically assigning a HA at the time of initial registration. Assigning
a new HA during an active session for the reasons given in this draft 
(primarily more optimal routing) does not seem like a magnificient idea, 
as there is the assumption of different geographic location, and hence
different home addresses for the two HA assignments, which means that such
a re-assignment during ongoing call will result in disruption of TCP sessions.

_Re_-assignment of HA during an active session for reasons like fail-over
I believe needs a different handling, and hopefully will be covered to
your satisfaction in the dynamic HA re-assignment draft I'm working on,
and hopefully will have out in a few weeks.

So I'm a bit doubtful about building in options in this draft which will
result in session disruption.

	Henrik


On Friday, 12 Dec 2003, George wrote:

> > Inline...
> > 
> > -----Original Message-----
> > From: Kent Leung [mailto:kleung@cisco.com]
> > Sent: Thursday, December 11, 2003 11:40 PM
> > To: Tsirtsis George
> > Cc: 'Henrik Levkowetz'; mip4@ietf.org; Pete McCann
> > Subject: RE: [Mip4] WG adoption call on
> > draft-kulkarni-mobileip-dynamic-as signment-02.txt
> > 
> > 
> > At 06:26 AM 12/11/2003 -0500, Tsirtsis George wrote:
> > 
> > 
> > >  "I support the adoption of this document as a workgroup document"
> > >
> > >
> > >A little bit more thought should be put into redirection from one assigned
> > >HA to another. This is the case where a MN is registered with HAx and
> > >potentially has active sessions based on the assigned HoAx. Based on
> > section
> > >4.2.2, HAx may for example detect that the MN is moving too far away from
> > >HAx and closer to HAy. HAx can then reject the next RREQ from the MN with a
> > >REDIRECTED-HA-ADDRESS Extension pointing to HAy. According to the current
> > >text the MN has now no choice but dropping HoAx (and all its associated
> > >sessions) to register with HAy which should provide HoAy. This will cause
> > >sessions to drop for the benefit of optimizing routing...not ideal IMO.
> > 
> > 
> > Right.  The assumption is that the MN is intelligent enough to decide 
> > exactly when
> > to re-anchor with a new HA (such as in idle state).  While MN has an active
> > session, it needs to maintain HoAx by setting the HA Address field to HAx
> > and not AZOA.
> 
> GT> Section 4.2.2 does not seem to say this. Instead, it says that the RREQ
> sent by the MN may have HA = (ALL-ZERO-ONE-ADDR  OR unicast address)....see
> packet format in step 1&2. In EITHER case the HA is able to reject and
> redirect (step 3).
> 
> > >One way to avoid this is to introduce a flag that specifies the redirection
> > >as optional or compulsory. If it is optional the MN should be able to stay
> > >with HAx for a while longer (e.g.: until current sessions stop and MN is
> > >idle). This may also require the REDIRECTED-HA-ADDRESS Extension (with
> > >flag=optional) to be attached to positive RREP rather than rejections. If,
> > >however, flag=compulsory (due to policy or other reasons) then the MN will
> > >have to register with HAy immediately per current draft and
> > >REDIRECTED-HA-ADDRESS Extensions will be attached to a reject RREP.
> > >
> > >Thoughts?
> > 
> > Redirection is optional or compulsory based on the HA address field being 
> > set to
> > HAx or AZOA.  If MN wants to stay with HAx until the active session
> > terminates, then the HA address field is set to HAx.  If MN don't care which
> > HA
> > is being used, and want optimal routing, then AZOA should be used in RRQ.
> > 
> > Does this satisfy your needs?
> > 
> GT> Almost. Maybe both things should be possible. If the MN wants to
> optimize routing then it should be able to send an ALL-ZERO-ONE-ADDR to the
> HA. This assumes that the MN has some understanding of the topology which
> may be true in some cases. In other cases, however, it might be the HA that
> has understanding of the topology, in which case the HA should be able to
> send either:
> - a *positive* RREP with an *optional* REDIRECTED-HA-ADDRESS extension OR 
> - a *negative* RREP with a *compulsory* REDIRECTED-HA-ADDRESS extension.
> 
> > 
> > >Finally, I think the draft would benefit from some clarification about how
> > >dynamic/static HoA allocation is affected by HA redirection. When HA
> > >redirection is used for load balancing (i.e.: all HAs are likely to be able
> > >to handle all HoA prefixes) MNs with static HoAs may be redirect. This can
> > >not be done if the HA redirection is used to provide a local HA to the MN
> > in
> > >which case the assigned HAs are not likely to support all the HoA prefixes.
> > 
> > 
> > Right, we should add more content on this topic.  My take on this is that
> > for
> > RRQs with static HoAs, the HoA field provides indication to the entity
> > that's
> > doing redirection to reach the proper HA (one that has the HoA subnet).
> > 
> GT> Agreed.


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From: Tsirtsis George <G.Tsirtsis@flarion.com>
To: "'Henrik Levkowetz'" <henrik@levkowetz.com>
Cc: "'Kent Leung'" <kleung@cisco.com>, mip4@ietf.org
Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
	 signment-02.txt
Date: Fri, 12 Dec 2003 08:06:51 -0500
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Henrik,

I think the point of my suggestion below is to make sure that session
disruption does not take place in the normal case:
- MN sends ALL-AERO-ONE-ADDR when idle or 
- HA sends an HA-Redirect in a positive RREP, in which case MN initiates
redirect as soon as idle). 

I think, however, that it is worth letting the HA redirect a mobile in a
compulsory way (HA sends HA redirect in negative RREP) if that is what needs
to be done from network perspective (e.g.: topology reasons, overloading
etc).

Note that MIP already allows session disruptions since an HA can always
reject a RREQ in which case sessions will be dropped. HA redirection
improves on that by allowing an HA to redirect an MN to another HA rather
than dropping it altogether.

George
P.S: So, does your draft compete with this one? or it solves a different
problem?
-----Original Message-----
From: Henrik Levkowetz [mailto:henrik@levkowetz.com]
Sent: Friday, December 12, 2003 11:13 AM
To: Tsirtsis George
Cc: 'Kent Leung'; mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-as signment-02.txt


George, Kent,

My impression of what this draft sets out to do is to provide a mechanism
for dynamically assigning a HA at the time of initial registration.
Assigning
a new HA during an active session for the reasons given in this draft 
(primarily more optimal routing) does not seem like a magnificient idea, 
as there is the assumption of different geographic location, and hence
different home addresses for the two HA assignments, which means that such
a re-assignment during ongoing call will result in disruption of TCP
sessions.

_Re_-assignment of HA during an active session for reasons like fail-over
I believe needs a different handling, and hopefully will be covered to
your satisfaction in the dynamic HA re-assignment draft I'm working on,
and hopefully will have out in a few weeks.

So I'm a bit doubtful about building in options in this draft which will
result in session disruption.

	Henrik


On Friday, 12 Dec 2003, George wrote:

> > Inline...
> > 
> > -----Original Message-----
> > From: Kent Leung [mailto:kleung@cisco.com]
> > Sent: Thursday, December 11, 2003 11:40 PM
> > To: Tsirtsis George
> > Cc: 'Henrik Levkowetz'; mip4@ietf.org; Pete McCann
> > Subject: RE: [Mip4] WG adoption call on
> > draft-kulkarni-mobileip-dynamic-as signment-02.txt
> > 
> > 
> > At 06:26 AM 12/11/2003 -0500, Tsirtsis George wrote:
> > 
> > 
> > >  "I support the adoption of this document as a workgroup document"
> > >
> > >
> > >A little bit more thought should be put into redirection from one
assigned
> > >HA to another. This is the case where a MN is registered with HAx and
> > >potentially has active sessions based on the assigned HoAx. Based on
> > section
> > >4.2.2, HAx may for example detect that the MN is moving too far away
from
> > >HAx and closer to HAy. HAx can then reject the next RREQ from the MN
with a
> > >REDIRECTED-HA-ADDRESS Extension pointing to HAy. According to the
current
> > >text the MN has now no choice but dropping HoAx (and all its associated
> > >sessions) to register with HAy which should provide HoAy. This will
cause
> > >sessions to drop for the benefit of optimizing routing...not ideal IMO.
> > 
> > 
> > Right.  The assumption is that the MN is intelligent enough to decide 
> > exactly when
> > to re-anchor with a new HA (such as in idle state).  While MN has an
active
> > session, it needs to maintain HoAx by setting the HA Address field to
HAx
> > and not AZOA.
> 
> GT> Section 4.2.2 does not seem to say this. Instead, it says that the
RREQ
> sent by the MN may have HA = (ALL-ZERO-ONE-ADDR  OR unicast
address)....see
> packet format in step 1&2. In EITHER case the HA is able to reject and
> redirect (step 3).
> 
> > >One way to avoid this is to introduce a flag that specifies the
redirection
> > >as optional or compulsory. If it is optional the MN should be able to
stay
> > >with HAx for a while longer (e.g.: until current sessions stop and MN
is
> > >idle). This may also require the REDIRECTED-HA-ADDRESS Extension (with
> > >flag=optional) to be attached to positive RREP rather than rejections.
If,
> > >however, flag=compulsory (due to policy or other reasons) then the MN
will
> > >have to register with HAy immediately per current draft and
> > >REDIRECTED-HA-ADDRESS Extensions will be attached to a reject RREP.
> > >
> > >Thoughts?
> > 
> > Redirection is optional or compulsory based on the HA address field
being 
> > set to
> > HAx or AZOA.  If MN wants to stay with HAx until the active session
> > terminates, then the HA address field is set to HAx.  If MN don't care
which
> > HA
> > is being used, and want optimal routing, then AZOA should be used in
RRQ.
> > 
> > Does this satisfy your needs?
> > 
> GT> Almost. Maybe both things should be possible. If the MN wants to
> optimize routing then it should be able to send an ALL-ZERO-ONE-ADDR to
the
> HA. This assumes that the MN has some understanding of the topology which
> may be true in some cases. In other cases, however, it might be the HA
that
> has understanding of the topology, in which case the HA should be able to
> send either:
> - a *positive* RREP with an *optional* REDIRECTED-HA-ADDRESS extension OR 
> - a *negative* RREP with a *compulsory* REDIRECTED-HA-ADDRESS extension.
> 
> > 
> > >Finally, I think the draft would benefit from some clarification about
how
> > >dynamic/static HoA allocation is affected by HA redirection. When HA
> > >redirection is used for load balancing (i.e.: all HAs are likely to be
able
> > >to handle all HoA prefixes) MNs with static HoAs may be redirect. This
can
> > >not be done if the HA redirection is used to provide a local HA to the
MN
> > in
> > >which case the assigned HAs are not likely to support all the HoA
prefixes.
> > 
> > 
> > Right, we should add more content on this topic.  My take on this is
that
> > for
> > RRQs with static HoAs, the HoA field provides indication to the entity
> > that's
> > doing redirection to reach the proper HA (one that has the HoA subnet).
> > 
> GT> Agreed.


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From: Henrik Levkowetz <henrik@levkowetz.com>
To: Tsirtsis George <G.Tsirtsis@flarion.com>
Cc: "'Kent Leung'" <kleung@cisco.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
 signment-02.txt
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On Friday, 12 Dec 2003, Tsirtsis wrote:

> I think the point of my suggestion below is to make sure that session
> disruption does not take place in the normal case:
> - MN sends ALL-AERO-ONE-ADDR when idle or 
> - HA sends an HA-Redirect in a positive RREP, in which case MN initiates
> redirect as soon as idle). 

Ok so far,

> I think, however, that it is worth letting the HA redirect a mobile in a
> compulsory way (HA sends HA redirect in negative RREP) if that is what needs
> to be done from network perspective (e.g.: topology reasons, overloading
> etc).

Yes, but I'm not sure whether it belongs in this draft or in the other.

> Note that MIP already allows session disruptions since an HA can always
> reject a RREQ in which case sessions will be dropped. HA redirection
> improves on that by allowing an HA to redirect an MN to another HA rather
> than dropping it altogether.

Right, but see below.

> P.S: So, does your draft compete with this one? or it solves a different

The intention is to _not_ compete. The charter says:

  Home agent assignment at the time of mobile-ip registration, rather
  than preconfigured for the mobile node, has been proposed in
  draft-kulkarni-mobileip-dynamic-assignment-01.txt. The WG will
  take on the task of completing this. The ability to switch the home
  agent assigned to a mobile node while registered will also be
  considered as part of this task. 

So the draft I'm working on will propose a message which can be originated
by the HA, saying in essence "from now on, the registration you had with
HA so-and-so will insead be handled by me"; the intention being to support
failover, overload etc.  One prerequisite for this mechanism is that the
two HA's have some way to share state - the most straightforward way being
to forward registration request and reply messages from the active HA to
the standby HA.

So I guess the dividing line would be whether the circumstances were such
that you could continue a session, or whether you anyhow would need to
break and re-establish. In the latter case, it seems reasonable to make
it part of dyn-assignment, in the other case it seems to belong with
the upcoming draft (reg-reassignment? failover? xxxx?).

	Henrik

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From: Tsirtsis George <G.Tsirtsis@flarion.com>
To: "'Henrik Levkowetz'" <henrik@levkowetz.com>,
        Tsirtsis George
	 <G.Tsirtsis@flarion.com>
Cc: "'Kent Leung'" <kleung@cisco.com>, mip4@ietf.org
Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
	 signment-02.txt
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The discussion was, however, about redirection to an HA that does not
necessarily share any state with the current HA. The question is whether
such redirection should only be optional or whether optional and compulsory
redirection should be allowed....(I prefer the latter).

Non of this seems to me to be affecting your draft as you describe below but
I will wait for it to come out so I can get the full picture of what is
being proposed.

Thanks
George

-----Original Message-----
From: Henrik Levkowetz [mailto:henrik@levkowetz.com]
Sent: Friday, December 12, 2003 2:01 PM
To: Tsirtsis George
Cc: 'Kent Leung'; mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-as signment-02.txt


On Friday, 12 Dec 2003, Tsirtsis wrote:

> I think the point of my suggestion below is to make sure that session
> disruption does not take place in the normal case:
> - MN sends ALL-AERO-ONE-ADDR when idle or 
> - HA sends an HA-Redirect in a positive RREP, in which case MN initiates
> redirect as soon as idle). 

Ok so far,

> I think, however, that it is worth letting the HA redirect a mobile in a
> compulsory way (HA sends HA redirect in negative RREP) if that is what
needs
> to be done from network perspective (e.g.: topology reasons, overloading
> etc).

Yes, but I'm not sure whether it belongs in this draft or in the other.

> Note that MIP already allows session disruptions since an HA can always
> reject a RREQ in which case sessions will be dropped. HA redirection
> improves on that by allowing an HA to redirect an MN to another HA rather
> than dropping it altogether.

Right, but see below.

> P.S: So, does your draft compete with this one? or it solves a different

The intention is to _not_ compete. The charter says:

  Home agent assignment at the time of mobile-ip registration, rather
  than preconfigured for the mobile node, has been proposed in
  draft-kulkarni-mobileip-dynamic-assignment-01.txt. The WG will
  take on the task of completing this. The ability to switch the home
  agent assigned to a mobile node while registered will also be
  considered as part of this task. 

So the draft I'm working on will propose a message which can be originated
by the HA, saying in essence "from now on, the registration you had with
HA so-and-so will insead be handled by me"; the intention being to support
failover, overload etc.  One prerequisite for this mechanism is that the
two HA's have some way to share state - the most straightforward way being
to forward registration request and reply messages from the active HA to
the standby HA.

So I guess the dividing line would be whether the circumstances were such
that you could continue a session, or whether you anyhow would need to
break and re-establish. In the latter case, it seems reasonable to make
it part of dyn-assignment, in the other case it seems to belong with
the upcoming draft (reg-reassignment? failover? xxxx?).

	Henrik

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Date: Fri, 12 Dec 2003 16:40:45 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: Tsirtsis George <G.Tsirtsis@flarion.com>
Cc: Tsirtsis George <G.Tsirtsis@flarion.com>,
        "'Kent Leung'"
 <kleung@cisco.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
 signment-02.txt
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On Friday, 12 Dec 2003, George Tsirtsis wrote:

> The discussion was, however, about redirection to an HA that does not
> necessarily share any state with the current HA. 

<chair hat off>
  Ok. It wasn't clear to me at first that this was what you desired,
  rather than what you thought you at best could get...
</chair hat off>

> The question is whether
> such redirection should only be optional or whether optional and compulsory
> redirection should be allowed....(I prefer the latter).

<chair hat on>
  From the viewpoint of the problem the dyn-assignment draft originally
  aimed to solve, only dynamic assignment at the start of a session was
  considered and seemed to make sense.
  
  If we are now talking about extending this to a mechanism which will
  break off a session, but include a next-ha in the RRP refusal, I think
  we need to make sure we have a constituency which needs such a thing,
  and we have to weigh the benefits against the drawbacks of having 
  a re-assignment mechanism which breaks off the current session.
</chair hat on>

<chair hat off>
  If we're going to have a mechanism to refuse a re-registration with
  a pointer to another HA, I'd prefer to be able to have it both
  optional and compulsory, as you seem to prefer too. But I'm not
  quite sure if the benefits in reduced round-trips of such a solution
  outweigh the simplicity of the HA simply refusing a registration, and
  the MN subsequently trying to register a new session and at that time
  be assigned a new HA, according to the mechanism of the current draft.
  Possibly it does.
</chair hat off>

> Non of this seems to me to be affecting your draft as you describe below but
> I will wait for it to come out so I can get the full picture of what is
> being proposed.

<chair hat off>
  Fair enough.
</chair hat off>

	Henrik

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To: Henrik Levkowetz <henrik@levkowetz.com>
From: Kent Leung <kleung@cisco.com>
Subject: Re: [Mip4] WG adoption call on
  draft-kulkarni-mobileip-dynamic-as signment-02.txt
Cc: Tsirtsis George <G.Tsirtsis@flarion.com>,
        Tsirtsis George <G.Tsirtsis@flarion.com>, mip4@ietf.org
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Right, the solution provided in this draft is for dynamically assigning
an HA for initial registration.  The mechanism allows the network to
choose an HA when MN request with AZOA or notify the MN the assigned
HA when MN request an administratively prohibited HA in RRQ.

Kent

At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
>On Friday, 12 Dec 2003, George Tsirtsis wrote:
>
> > The discussion was, however, about redirection to an HA that does not
> > necessarily share any state with the current HA.
>
><chair hat off>
>   Ok. It wasn't clear to me at first that this was what you desired,
>   rather than what you thought you at best could get...
></chair hat off>
>
> > The question is whether
> > such redirection should only be optional or whether optional and compulsory
> > redirection should be allowed....(I prefer the latter).
>
><chair hat on>
>   From the viewpoint of the problem the dyn-assignment draft originally
>   aimed to solve, only dynamic assignment at the start of a session was
>   considered and seemed to make sense.
>
>   If we are now talking about extending this to a mechanism which will
>   break off a session, but include a next-ha in the RRP refusal, I think
>   we need to make sure we have a constituency which needs such a thing,
>   and we have to weigh the benefits against the drawbacks of having
>   a re-assignment mechanism which breaks off the current session.
></chair hat on>
>
><chair hat off>
>   If we're going to have a mechanism to refuse a re-registration with
>   a pointer to another HA, I'd prefer to be able to have it both
>   optional and compulsory, as you seem to prefer too. But I'm not
>   quite sure if the benefits in reduced round-trips of such a solution
>   outweigh the simplicity of the HA simply refusing a registration, and
>   the MN subsequently trying to register a new session and at that time
>   be assigned a new HA, according to the mechanism of the current draft.
>   Possibly it does.
></chair hat off>
>
> > Non of this seems to me to be affecting your draft as you describe 
> below but
> > I will wait for it to come out so I can get the full picture of what is
> > being proposed.
>
><chair hat off>
>   Fair enough.
></chair hat off>
>
>         Henrik


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From: Tsirtsis George <G.Tsirtsis@flarion.com>
To: "'Kent Leung'" <kleung@cisco.com>,
        Henrik Levkowetz
	 <henrik@levkowetz.com>
Cc: mip4@ietf.org
Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
	 signment-02.txt
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But the draft clearly *also* talks about redirection for the purpose of
routing optimality....mind you I think this is a good thing :-)

George
-----Original Message-----
From: Kent Leung [mailto:kleung@cisco.com]
Sent: Friday, December 12, 2003 3:57 PM
To: Henrik Levkowetz
Cc: Tsirtsis George; Tsirtsis George; mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-as signment-02.txt


Right, the solution provided in this draft is for dynamically assigning
an HA for initial registration.  The mechanism allows the network to
choose an HA when MN request with AZOA or notify the MN the assigned
HA when MN request an administratively prohibited HA in RRQ.

Kent

At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
>On Friday, 12 Dec 2003, George Tsirtsis wrote:
>
> > The discussion was, however, about redirection to an HA that does not
> > necessarily share any state with the current HA.
>
><chair hat off>
>   Ok. It wasn't clear to me at first that this was what you desired,
>   rather than what you thought you at best could get...
></chair hat off>
>
> > The question is whether
> > such redirection should only be optional or whether optional and
compulsory
> > redirection should be allowed....(I prefer the latter).
>
><chair hat on>
>   From the viewpoint of the problem the dyn-assignment draft originally
>   aimed to solve, only dynamic assignment at the start of a session was
>   considered and seemed to make sense.
>
>   If we are now talking about extending this to a mechanism which will
>   break off a session, but include a next-ha in the RRP refusal, I think
>   we need to make sure we have a constituency which needs such a thing,
>   and we have to weigh the benefits against the drawbacks of having
>   a re-assignment mechanism which breaks off the current session.
></chair hat on>
>
><chair hat off>
>   If we're going to have a mechanism to refuse a re-registration with
>   a pointer to another HA, I'd prefer to be able to have it both
>   optional and compulsory, as you seem to prefer too. But I'm not
>   quite sure if the benefits in reduced round-trips of such a solution
>   outweigh the simplicity of the HA simply refusing a registration, and
>   the MN subsequently trying to register a new session and at that time
>   be assigned a new HA, according to the mechanism of the current draft.
>   Possibly it does.
></chair hat off>
>
> > Non of this seems to me to be affecting your draft as you describe 
> below but
> > I will wait for it to come out so I can get the full picture of what is
> > being proposed.
>
><chair hat off>
>   Fair enough.
></chair hat off>
>
>         Henrik

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From: Alpesh <alpesh@cisco.com>
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To: Tsirtsis George <G.Tsirtsis@flarion.com>
CC: "'Kent Leung'" <kleung@cisco.com>,
        Henrik Levkowetz
 <henrik@levkowetz.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
  signment-02.txt
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George -

Yes, but the 'redirection' was intended to happen during the initial 
registration. With little extension/
expansion of interpretation of the text we can accomodate the 
'in-session' redirection/reanchoring
that you suggest. But that would break the session. Henrik's draft would 
achieve reanchoring without
losing session - probably both methods can be supported??

Alpesh

Tsirtsis George wrote:

>But the draft clearly *also* talks about redirection for the purpose of
>routing optimality....mind you I think this is a good thing :-)
>
>George
>-----Original Message-----
>From: Kent Leung [mailto:kleung@cisco.com]
>Sent: Friday, December 12, 2003 3:57 PM
>To: Henrik Levkowetz
>Cc: Tsirtsis George; Tsirtsis George; mip4@ietf.org
>Subject: Re: [Mip4] WG adoption call on
>draft-kulkarni-mobileip-dynamic-as signment-02.txt
>
>
>Right, the solution provided in this draft is for dynamically assigning
>an HA for initial registration.  The mechanism allows the network to
>choose an HA when MN request with AZOA or notify the MN the assigned
>HA when MN request an administratively prohibited HA in RRQ.
>
>Kent
>
>At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
>  
>
>>On Friday, 12 Dec 2003, George Tsirtsis wrote:
>>
>>    
>>
>>>The discussion was, however, about redirection to an HA that does not
>>>necessarily share any state with the current HA.
>>>      
>>>
>><chair hat off>
>>  Ok. It wasn't clear to me at first that this was what you desired,
>>  rather than what you thought you at best could get...
>></chair hat off>
>>
>>    
>>
>>>The question is whether
>>>such redirection should only be optional or whether optional and
>>>      
>>>
>compulsory
>  
>
>>>redirection should be allowed....(I prefer the latter).
>>>      
>>>
>><chair hat on>
>>  From the viewpoint of the problem the dyn-assignment draft originally
>>  aimed to solve, only dynamic assignment at the start of a session was
>>  considered and seemed to make sense.
>>
>>  If we are now talking about extending this to a mechanism which will
>>  break off a session, but include a next-ha in the RRP refusal, I think
>>  we need to make sure we have a constituency which needs such a thing,
>>  and we have to weigh the benefits against the drawbacks of having
>>  a re-assignment mechanism which breaks off the current session.
>></chair hat on>
>>
>><chair hat off>
>>  If we're going to have a mechanism to refuse a re-registration with
>>  a pointer to another HA, I'd prefer to be able to have it both
>>  optional and compulsory, as you seem to prefer too. But I'm not
>>  quite sure if the benefits in reduced round-trips of such a solution
>>  outweigh the simplicity of the HA simply refusing a registration, and
>>  the MN subsequently trying to register a new session and at that time
>>  be assigned a new HA, according to the mechanism of the current draft.
>>  Possibly it does.
>></chair hat off>
>>
>>    
>>
>>>Non of this seems to me to be affecting your draft as you describe 
>>>      
>>>
>>below but
>>    
>>
>>>I will wait for it to come out so I can get the full picture of what is
>>>being proposed.
>>>      
>>>
>><chair hat off>
>>  Fair enough.
>></chair hat off>
>>
>>        Henrik
>>    
>>
>
>  
>


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George -<br>
<br>
Yes, but the 'redirection' was intended to happen during the initial registration.
With little extension/<br>
expansion of interpretation of the text we can accomodate the 'in-session'
redirection/reanchoring<br>
that you suggest. But that would break the session. Henrik's draft would
achieve reanchoring without<br>
losing session - probably both methods can be supported?? <br>
<br>
Alpesh<br>
<br>
Tsirtsis George wrote:<br>
<blockquote type="cite"
 cite="mid9E3BA3946476AD4EB94672712B12A85F03AA7F@ftmail.lab.flarion.com">
  <pre wrap="">But the draft clearly *also* talks about redirection for the purpose of
routing optimality....mind you I think this is a good thing :-)

George
-----Original Message-----
From: Kent Leung [<a class="moz-txt-link-freetext" href="mailto:kleung@cisco.com">mailto:kleung@cisco.com</a>]
Sent: Friday, December 12, 2003 3:57 PM
To: Henrik Levkowetz
Cc: Tsirtsis George; Tsirtsis George; <a class="moz-txt-link-abbreviated" href="mailto:mip4@ietf.org">mip4@ietf.org</a>
Subject: Re: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-as signment-02.txt


Right, the solution provided in this draft is for dynamically assigning
an HA for initial registration.  The mechanism allows the network to
choose an HA when MN request with AZOA or notify the MN the assigned
HA when MN request an administratively prohibited HA in RRQ.

Kent

At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
  </pre>
  <blockquote type="cite">
    <pre wrap="">On Friday, 12 Dec 2003, George Tsirtsis wrote:

    </pre>
    <blockquote type="cite">
      <pre wrap="">The discussion was, however, about redirection to an HA that does not
necessarily share any state with the current HA.
      </pre>
    </blockquote>
    <pre wrap="">&lt;chair hat off&gt;
  Ok. It wasn't clear to me at first that this was what you desired,
  rather than what you thought you at best could get...
&lt;/chair hat off&gt;

    </pre>
    <blockquote type="cite">
      <pre wrap="">The question is whether
such redirection should only be optional or whether optional and
      </pre>
    </blockquote>
  </blockquote>
  <pre wrap=""><!---->compulsory
  </pre>
  <blockquote type="cite">
    <blockquote type="cite">
      <pre wrap="">redirection should be allowed....(I prefer the latter).
      </pre>
    </blockquote>
    <pre wrap="">&lt;chair hat on&gt;
  From the viewpoint of the problem the dyn-assignment draft originally
  aimed to solve, only dynamic assignment at the start of a session was
  considered and seemed to make sense.

  If we are now talking about extending this to a mechanism which will
  break off a session, but include a next-ha in the RRP refusal, I think
  we need to make sure we have a constituency which needs such a thing,
  and we have to weigh the benefits against the drawbacks of having
  a re-assignment mechanism which breaks off the current session.
&lt;/chair hat on&gt;

&lt;chair hat off&gt;
  If we're going to have a mechanism to refuse a re-registration with
  a pointer to another HA, I'd prefer to be able to have it both
  optional and compulsory, as you seem to prefer too. But I'm not
  quite sure if the benefits in reduced round-trips of such a solution
  outweigh the simplicity of the HA simply refusing a registration, and
  the MN subsequently trying to register a new session and at that time
  be assigned a new HA, according to the mechanism of the current draft.
  Possibly it does.
&lt;/chair hat off&gt;

    </pre>
    <blockquote type="cite">
      <pre wrap="">Non of this seems to me to be affecting your draft as you describe 
      </pre>
    </blockquote>
    <pre wrap="">below but
    </pre>
    <blockquote type="cite">
      <pre wrap="">I will wait for it to come out so I can get the full picture of what is
being proposed.
      </pre>
    </blockquote>
    <pre wrap="">&lt;chair hat off&gt;
  Fair enough.
&lt;/chair hat off&gt;

        Henrik
    </pre>
  </blockquote>
  <pre wrap=""><!---->
  </pre>
</blockquote>
<br>
</body>
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From exim@www1.ietf.org  Fri Dec 12 11:56:31 2003
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From: Tsirtsis George <G.Tsirtsis@flarion.com>
To: "'Alpesh'" <alpesh@cisco.com>
Cc: "'Kent Leung'" <kleung@cisco.com>,
        Henrik Levkowetz
	 <henrik@levkowetz.com>, mip4@ietf.org
Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
	 signment-02.txt
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I am suggesting two things:
 
1) Allow the HA to send a positive RREP with an optional HA redirection
extensions. This will allow a MN to change to the new HA at a time that is
convenient to it i.e.: when it is idle and thus sessions will not be
interrupted
 
2) Allow the HA to send a negative RREP with a compulsory HA redirection
extensions. This will allow an HA to offload a MN for whatever reason to
another HA (with which it may or may not share state)
 
Suggestion (1) above does not cause any session interruption and I sense
that you guys are ok with? Suggestion (2) may cause session interruption and
at least Henrik was not a big fan of this.
 
Henrik's draft, if I understand this correctly, allows HA redirection at any
time but only between HAs that *share* state.
 
The kulkarni draft also allows for HA redirection during initial
registration as it has already been stated
 
Is this making any sense? :-)
 
George

-----Original Message-----
From: Alpesh [mailto:alpesh@cisco.com]
Sent: Friday, December 12, 2003 4:26 PM
To: Tsirtsis George
Cc: 'Kent Leung'; Henrik Levkowetz; mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
signment-02.txt


George -

Yes, but the 'redirection' was intended to happen during the initial
registration. With little extension/
expansion of interpretation of the text we can accomodate the 'in-session'
redirection/reanchoring
that you suggest. But that would break the session. Henrik's draft would
achieve reanchoring without
losing session - probably both methods can be supported?? 

Alpesh

Tsirtsis George wrote:


But the draft clearly *also* talks about redirection for the purpose of

routing optimality....mind you I think this is a good thing :-)



George

-----Original Message-----

From: Kent Leung [ mailto:kleung@cisco.com <mailto:kleung@cisco.com> ]

Sent: Friday, December 12, 2003 3:57 PM

To: Henrik Levkowetz

Cc: Tsirtsis George; Tsirtsis George;  mip4@ietf.org <mailto:mip4@ietf.org> 

Subject: Re: [Mip4] WG adoption call on

draft-kulkarni-mobileip-dynamic-as signment-02.txt





Right, the solution provided in this draft is for dynamically assigning

an HA for initial registration.  The mechanism allows the network to

choose an HA when MN request with AZOA or notify the MN the assigned

HA when MN request an administratively prohibited HA in RRQ.



Kent



At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:

  

On Friday, 12 Dec 2003, George Tsirtsis wrote:



    

The discussion was, however, about redirection to an HA that does not

necessarily share any state with the current HA.

      

<chair hat off>

  Ok. It wasn't clear to me at first that this was what you desired,

  rather than what you thought you at best could get...

</chair hat off>



    

The question is whether

such redirection should only be optional or whether optional and

      

compulsory

  

redirection should be allowed....(I prefer the latter).

      

<chair hat on>

  From the viewpoint of the problem the dyn-assignment draft originally

  aimed to solve, only dynamic assignment at the start of a session was

  considered and seemed to make sense.



  If we are now talking about extending this to a mechanism which will

  break off a session, but include a next-ha in the RRP refusal, I think

  we need to make sure we have a constituency which needs such a thing,

  and we have to weigh the benefits against the drawbacks of having

  a re-assignment mechanism which breaks off the current session.

</chair hat on>



<chair hat off>

  If we're going to have a mechanism to refuse a re-registration with

  a pointer to another HA, I'd prefer to be able to have it both

  optional and compulsory, as you seem to prefer too. But I'm not

  quite sure if the benefits in reduced round-trips of such a solution

  outweigh the simplicity of the HA simply refusing a registration, and

  the MN subsequently trying to register a new session and at that time

  be assigned a new HA, according to the mechanism of the current draft.

  Possibly it does.

</chair hat off>



    

Non of this seems to me to be affecting your draft as you describe 

      

below but

    

I will wait for it to come out so I can get the full picture of what is

being proposed.

      

<chair hat off>

  Fair enough.

</chair hat off>



        Henrik

    



  



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<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff size=2>I am 
suggesting two things:</FONT></SPAN></DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff size=2>1) 
Allow the HA to send a positive RREP with an optional HA redirection extensions. 
This will allow a MN to change to the new HA at a time that is convenient to it 
i.e.: when it is idle and thus sessions will not be 
interrupted</FONT></SPAN></DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff size=2>2) 
Allow the HA to send a negative RREP with a compulsory HA redirection 
extensions. This will allow an HA to offload a MN for whatever reason to another 
HA (with which it may or may not share state)</FONT></SPAN></DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2>Suggestion (1) above does not cause any session interruption and I sense 
that you guys are ok with? Suggestion (2) may cause session interruption and at 
least Henrik was not a big fan of this.</FONT></SPAN></DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2>Henrik's draft, if I understand this correctly, allows HA redirection at 
any time but only between HAs that *share* state.</FONT></SPAN></DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff size=2>The 
kulkarni draft also allows for HA redirection during initial registration as it 
has already been stated</FONT></SPAN></DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff size=2>Is 
this making any sense? :-)</FONT></SPAN></DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
size=2>George</FONT></SPAN></DIV>
<BLOCKQUOTE>
  <DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma 
  size=2>-----Original Message-----<BR><B>From:</B> Alpesh 
  [mailto:alpesh@cisco.com]<BR><B>Sent:</B> Friday, December 12, 2003 4:26 
  PM<BR><B>To:</B> Tsirtsis George<BR><B>Cc:</B> 'Kent Leung'; Henrik Levkowetz; 
  mip4@ietf.org<BR><B>Subject:</B> Re: [Mip4] WG adoption call on 
  draft-kulkarni-mobileip-dynamic-as signment-02.txt<BR><BR></FONT></DIV>George 
  -<BR><BR>Yes, but the 'redirection' was intended to happen during the initial 
  registration. With little extension/<BR>expansion of interpretation of the 
  text we can accomodate the 'in-session' redirection/reanchoring<BR>that you 
  suggest. But that would break the session. Henrik's draft would achieve 
  reanchoring without<BR>losing session - probably both methods can be 
  supported?? <BR><BR>Alpesh<BR><BR>Tsirtsis George wrote:<BR>
  <BLOCKQUOTE 
  cite=mid9E3BA3946476AD4EB94672712B12A85F03AA7F@ftmail.lab.flarion.com 
  type="cite"><PRE wrap="">But the draft clearly *also* talks about redirection for the purpose of
routing optimality....mind you I think this is a good thing :-)

George
-----Original Message-----
From: Kent Leung [<A class=moz-txt-link-freetext href="mailto:kleung@cisco.com">mailto:kleung@cisco.com</A>]
Sent: Friday, December 12, 2003 3:57 PM
To: Henrik Levkowetz
Cc: Tsirtsis George; Tsirtsis George; <A class=moz-txt-link-abbreviated href="mailto:mip4@ietf.org">mip4@ietf.org</A>
Subject: Re: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-as signment-02.txt


Right, the solution provided in this draft is for dynamically assigning
an HA for initial registration.  The mechanism allows the network to
choose an HA when MN request with AZOA or notify the MN the assigned
HA when MN request an administratively prohibited HA in RRQ.

Kent

At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
  </PRE>
    <BLOCKQUOTE type="cite"><PRE wrap="">On Friday, 12 Dec 2003, George Tsirtsis wrote:

    </PRE>
      <BLOCKQUOTE type="cite"><PRE wrap="">The discussion was, however, about redirection to an HA that does not
necessarily share any state with the current HA.
      </PRE></BLOCKQUOTE><PRE wrap="">&lt;chair hat off&gt;
  Ok. It wasn't clear to me at first that this was what you desired,
  rather than what you thought you at best could get...
&lt;/chair hat off&gt;

    </PRE>
      <BLOCKQUOTE type="cite"><PRE wrap="">The question is whether
such redirection should only be optional or whether optional and
      </PRE></BLOCKQUOTE></BLOCKQUOTE><PRE wrap=""><!---->compulsory
  </PRE>
    <BLOCKQUOTE type="cite">
      <BLOCKQUOTE type="cite"><PRE wrap="">redirection should be allowed....(I prefer the latter).
      </PRE></BLOCKQUOTE><PRE wrap="">&lt;chair hat on&gt;
  From the viewpoint of the problem the dyn-assignment draft originally
  aimed to solve, only dynamic assignment at the start of a session was
  considered and seemed to make sense.

  If we are now talking about extending this to a mechanism which will
  break off a session, but include a next-ha in the RRP refusal, I think
  we need to make sure we have a constituency which needs such a thing,
  and we have to weigh the benefits against the drawbacks of having
  a re-assignment mechanism which breaks off the current session.
&lt;/chair hat on&gt;

&lt;chair hat off&gt;
  If we're going to have a mechanism to refuse a re-registration with
  a pointer to another HA, I'd prefer to be able to have it both
  optional and compulsory, as you seem to prefer too. But I'm not
  quite sure if the benefits in reduced round-trips of such a solution
  outweigh the simplicity of the HA simply refusing a registration, and
  the MN subsequently trying to register a new session and at that time
  be assigned a new HA, according to the mechanism of the current draft.
  Possibly it does.
&lt;/chair hat off&gt;

    </PRE>
      <BLOCKQUOTE type="cite"><PRE wrap="">Non of this seems to me to be affecting your draft as you describe 
      </PRE></BLOCKQUOTE><PRE wrap="">below but
    </PRE>
      <BLOCKQUOTE type="cite"><PRE wrap="">I will wait for it to come out so I can get the full picture of what is
being proposed.
      </PRE></BLOCKQUOTE><PRE wrap="">&lt;chair hat off&gt;
  Fair enough.
&lt;/chair hat off&gt;

        Henrik
    </PRE></BLOCKQUOTE><PRE wrap=""><!---->
  </PRE></BLOCKQUOTE><BR></BLOCKQUOTE></BODY></HTML>

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Alexandru -

We are in the same boat as you. Anchoring with HA's on the local subnet is
not a problem. Henrik is solving the geographic reanchoring - or so I think.

Henrik - I think the WG is waiting for you to break the suspense :)

-a

Alexandru Petrescu wrote:

> Alpesh wrote:
>
>> Henrik's draft would achieve reanchoring without losing session
>
>
> I'm trying to understand how that could happen.
>
> I was directed to read about VRRP and CARP, which I did.  Both VRRP and
> CARP seem to act on a local subnet.  VRRP (HSRP, VSTB) seem to offer
> end-hosts a means to dynamically select first-hop routers instead of
> statically configuring a default route.  CARP seems to provide
> load-balancing of several routers on same link that would be addressable
> by a unique IP address.  This is my first reading, sorry if 
> misinterpreting.
>
> So VRRP and CARP act only within the scope of a same link.
>
> So, I was wondering whether the HA re-anchoring considers that HA's are
> separated by routers, or that HA's are all linked together by a unique 
> link?
>
> Alex
>
>
>



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George -

Oh, don't get me wrong - I totally agree with both the suggestions and 
understand them. We had been thinking
of a revision on similar sort a little before last IETF, but are holding 
for Henrik's draft to come out :)

Alpesh

Tsirtsis George wrote:

> I am suggesting two things:
>  
> 1) Allow the HA to send a positive RREP with an optional HA 
> redirection extensions. This will allow a MN to change to the new HA 
> at a time that is convenient to it i.e.: when it is idle and thus 
> sessions will not be interrupted
>  
> 2) Allow the HA to send a negative RREP with a compulsory HA 
> redirection extensions. This will allow an HA to offload a MN for 
> whatever reason to another HA (with which it may or may not share state)
>  
> Suggestion (1) above does not cause any session interruption and I 
> sense that you guys are ok with? Suggestion (2) may cause session 
> interruption and at least Henrik was not a big fan of this.
>  
> Henrik's draft, if I understand this correctly, allows HA redirection 
> at any time but only between HAs that *share* state.
>  
> The kulkarni draft also allows for HA redirection during initial 
> registration as it has already been stated
>  
> Is this making any sense? :-)
>  
> George
>
>     -----Original Message-----
>     From: Alpesh [mailto:alpesh@cisco.com]
>     Sent: Friday, December 12, 2003 4:26 PM
>     To: Tsirtsis George
>     Cc: 'Kent Leung'; Henrik Levkowetz; mip4@ietf.org
>     Subject: Re: [Mip4] WG adoption call on
>     draft-kulkarni-mobileip-dynamic-as signment-02.txt
>
>     George -
>
>     Yes, but the 'redirection' was intended to happen during the
>     initial registration. With little extension/
>     expansion of interpretation of the text we can accomodate the
>     'in-session' redirection/reanchoring
>     that you suggest. But that would break the session. Henrik's draft
>     would achieve reanchoring without
>     losing session - probably both methods can be supported??
>
>     Alpesh
>
>     Tsirtsis George wrote:
>
>>But the draft clearly *also* talks about redirection for the purpose of
>>routing optimality....mind you I think this is a good thing :-)
>>
>>George
>>-----Original Message-----
>>From: Kent Leung [mailto:kleung@cisco.com]
>>Sent: Friday, December 12, 2003 3:57 PM
>>To: Henrik Levkowetz
>>Cc: Tsirtsis George; Tsirtsis George; mip4@ietf.org
>>Subject: Re: [Mip4] WG adoption call on
>>draft-kulkarni-mobileip-dynamic-as signment-02.txt
>>
>>
>>Right, the solution provided in this draft is for dynamically assigning
>>an HA for initial registration.  The mechanism allows the network to
>>choose an HA when MN request with AZOA or notify the MN the assigned
>>HA when MN request an administratively prohibited HA in RRQ.
>>
>>Kent
>>
>>At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
>>  
>>
>>>On Friday, 12 Dec 2003, George Tsirtsis wrote:
>>>
>>>    
>>>
>>>>The discussion was, however, about redirection to an HA that does not
>>>>necessarily share any state with the current HA.
>>>>      
>>>>
>>><chair hat off>
>>>  Ok. It wasn't clear to me at first that this was what you desired,
>>>  rather than what you thought you at best could get...
>>></chair hat off>
>>>
>>>    
>>>
>>>>The question is whether
>>>>such redirection should only be optional or whether optional and
>>>>      
>>>>
>>compulsory
>>  
>>
>>>>redirection should be allowed....(I prefer the latter).
>>>>      
>>>>
>>><chair hat on>
>>>  From the viewpoint of the problem the dyn-assignment draft originally
>>>  aimed to solve, only dynamic assignment at the start of a session was
>>>  considered and seemed to make sense.
>>>
>>>  If we are now talking about extending this to a mechanism which will
>>>  break off a session, but include a next-ha in the RRP refusal, I think
>>>  we need to make sure we have a constituency which needs such a thing,
>>>  and we have to weigh the benefits against the drawbacks of having
>>>  a re-assignment mechanism which breaks off the current session.
>>></chair hat on>
>>>
>>><chair hat off>
>>>  If we're going to have a mechanism to refuse a re-registration with
>>>  a pointer to another HA, I'd prefer to be able to have it both
>>>  optional and compulsory, as you seem to prefer too. But I'm not
>>>  quite sure if the benefits in reduced round-trips of such a solution
>>>  outweigh the simplicity of the HA simply refusing a registration, and
>>>  the MN subsequently trying to register a new session and at that time
>>>  be assigned a new HA, according to the mechanism of the current draft.
>>>  Possibly it does.
>>></chair hat off>
>>>
>>>    
>>>
>>>>Non of this seems to me to be affecting your draft as you describe 
>>>>      
>>>>
>>>below but
>>>    
>>>
>>>>I will wait for it to come out so I can get the full picture of what is
>>>>being proposed.
>>>>      
>>>>
>>><chair hat off>
>>>  Fair enough.
>>></chair hat off>
>>>
>>>        Henrik
>>>    
>>>
>>
>>  
>>
>


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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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</head>
<body>
George -<br>
<br>
Oh, don't get me wrong - I totally agree with both the suggestions and understand
them. We had been thinking<br>
of a revision on similar sort a little before last IETF, but are holding
for Henrik's draft to come out :)<br>
<br>
Alpesh<br>
<br>
Tsirtsis George wrote:<br>
<blockquote type="cite"
 cite="mid9E3BA3946476AD4EB94672712B12A85F03AA80@ftmail.lab.flarion.com"> 
 
  <meta http-equiv="Content-Type" content="text/html; ">
  <title></title>
   
  <meta content="MSHTML 6.00.2800.1276" name="GENERATOR">
 
  <div><span class="517494716-12122003"><font face="Arial"
 color="#0000ff" size="2">I am  suggesting two things:</font></span></div>
 
  <div><span class="517494716-12122003"></span>&nbsp;</div>
 
  <div><span class="517494716-12122003"><font face="Arial"
 color="#0000ff" size="2">1)  Allow the HA to send a positive RREP with an
optional HA redirection extensions.  This will allow a MN to change to the
new HA at a time that is convenient to it  i.e.: when it is idle and thus
sessions will not be  interrupted</font></span></div>
 
  <div><span class="517494716-12122003"></span>&nbsp;</div>
 
  <div><span class="517494716-12122003"><font face="Arial"
 color="#0000ff" size="2">2)  Allow the HA to send a negative RREP with a
compulsory HA redirection  extensions. This will allow an HA to offload a
MN for whatever reason to another  HA (with which it may or may not share
state)</font></span></div>
 
  <div><span class="517494716-12122003"></span>&nbsp;</div>
 
  <div><span class="517494716-12122003"><font face="Arial"
 color="#0000ff" size="2">Suggestion (1) above does not cause any session
interruption and I sense  that you guys are ok with? Suggestion (2) may cause
session interruption and at  least Henrik was not a big fan of this.</font></span></div>
 
  <div><span class="517494716-12122003"></span>&nbsp;</div>
 
  <div><span class="517494716-12122003"><font face="Arial"
 color="#0000ff" size="2">Henrik's draft, if I understand this correctly,
allows HA redirection at  any time but only between HAs that *share* state.</font></span></div>
 
  <div><span class="517494716-12122003"></span>&nbsp;</div>
 
  <div><span class="517494716-12122003"><font face="Arial"
 color="#0000ff" size="2">The  kulkarni draft also allows for HA redirection
during initial registration as it  has already been stated</font></span></div>
 
  <div><span class="517494716-12122003"></span>&nbsp;</div>
 
  <div><span class="517494716-12122003"><font face="Arial"
 color="#0000ff" size="2">Is  this making any sense? :-)</font></span></div>
 
  <div><span class="517494716-12122003"></span>&nbsp;</div>
 
  <div><span class="517494716-12122003"><font face="Arial"
 color="#0000ff" size="2">George</font></span></div>
 
  <blockquote>   
    <div class="OutlookMessageHeader" dir="ltr" align="left"><font
 face="Tahoma" size="2">-----Original Message-----<br>
    <b>From:</b> Alpesh    [<a class="moz-txt-link-freetext" href="mailto:alpesh@cisco.com">mailto:alpesh@cisco.com</a>]<br>
    <b>Sent:</b> Friday, December 12, 2003 4:26    PM<br>
    <b>To:</b> Tsirtsis George<br>
    <b>Cc:</b> 'Kent Leung'; Henrik Levkowetz;    <a class="moz-txt-link-abbreviated" href="mailto:mip4@ietf.org">mip4@ietf.org</a><br>
    <b>Subject:</b> Re: [Mip4] WG adoption call on    draft-kulkarni-mobileip-dynamic-as
signment-02.txt<br>
    <br>
    </font></div>
George    -<br>
    <br>
Yes, but the 'redirection' was intended to happen during the initial    registration.
With little extension/<br>
expansion of interpretation of the    text we can accomodate the 'in-session'
redirection/reanchoring<br>
that you    suggest. But that would break the session. Henrik's draft would
achieve    reanchoring without<br>
losing session - probably both methods can be    supported?? <br>
    <br>
Alpesh<br>
    <br>
Tsirtsis George wrote:<br>
   
    <blockquote
 cite="mid9E3BA3946476AD4EB94672712B12A85F03AA7F@ftmail.lab.flarion.com"
 type="cite">
      <pre wrap="">But the draft clearly *also* talks about redirection for the purpose of
routing optimality....mind you I think this is a good thing :-)

George
-----Original Message-----
From: Kent Leung [<a class="moz-txt-link-freetext"
 href="mailto:kleung@cisco.com">mailto:kleung@cisco.com</a>]
Sent: Friday, December 12, 2003 3:57 PM
To: Henrik Levkowetz
Cc: Tsirtsis George; Tsirtsis George; <a
 class="moz-txt-link-abbreviated" href="mailto:mip4@ietf.org">mip4@ietf.org</a>
Subject: Re: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-as signment-02.txt


Right, the solution provided in this draft is for dynamically assigning
an HA for initial registration.  The mechanism allows the network to
choose an HA when MN request with AZOA or notify the MN the assigned
HA when MN request an administratively prohibited HA in RRQ.

Kent

At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
  </pre>
     
      <blockquote type="cite">
        <pre wrap="">On Friday, 12 Dec 2003, George Tsirtsis wrote:

    </pre>
       
        <blockquote type="cite">
          <pre wrap="">The discussion was, however, about redirection to an HA that does not
necessarily share any state with the current HA.
      </pre>
        </blockquote>
        <pre wrap="">&lt;chair hat off&gt;
  Ok. It wasn't clear to me at first that this was what you desired,
  rather than what you thought you at best could get...
&lt;/chair hat off&gt;

    </pre>
       
        <blockquote type="cite">
          <pre wrap="">The question is whether
such redirection should only be optional or whether optional and
      </pre>
        </blockquote>
      </blockquote>
      <pre wrap=""><!---->compulsory
  </pre>
     
      <blockquote type="cite">       
        <blockquote type="cite">
          <pre wrap="">redirection should be allowed....(I prefer the latter).
      </pre>
        </blockquote>
        <pre wrap="">&lt;chair hat on&gt;
  From the viewpoint of the problem the dyn-assignment draft originally
  aimed to solve, only dynamic assignment at the start of a session was
  considered and seemed to make sense.

  If we are now talking about extending this to a mechanism which will
  break off a session, but include a next-ha in the RRP refusal, I think
  we need to make sure we have a constituency which needs such a thing,
  and we have to weigh the benefits against the drawbacks of having
  a re-assignment mechanism which breaks off the current session.
&lt;/chair hat on&gt;

&lt;chair hat off&gt;
  If we're going to have a mechanism to refuse a re-registration with
  a pointer to another HA, I'd prefer to be able to have it both
  optional and compulsory, as you seem to prefer too. But I'm not
  quite sure if the benefits in reduced round-trips of such a solution
  outweigh the simplicity of the HA simply refusing a registration, and
  the MN subsequently trying to register a new session and at that time
  be assigned a new HA, according to the mechanism of the current draft.
  Possibly it does.
&lt;/chair hat off&gt;

    </pre>
       
        <blockquote type="cite">
          <pre wrap="">Non of this seems to me to be affecting your draft as you describe 
      </pre>
        </blockquote>
        <pre wrap="">below but
    </pre>
       
        <blockquote type="cite">
          <pre wrap="">I will wait for it to come out so I can get the full picture of what is
being proposed.
      </pre>
        </blockquote>
        <pre wrap="">&lt;chair hat off&gt;
  Fair enough.
&lt;/chair hat off&gt;

        Henrik
    </pre>
      </blockquote>
      <pre wrap=""><!---->
  </pre>
    </blockquote>
    <br>
  </blockquote>
</blockquote>
<br>
</body>
</html>

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From: Tsirtsis George <G.Tsirtsis@flarion.com>
To: "'Alpesh'" <alpesh@cisco.com>
Cc: "'Kent Leung'" <kleung@cisco.com>,
        Henrik Levkowetz
	 <henrik@levkowetz.com>, mip4@ietf.org
Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
	 signment-02.txt
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Ack, lets wait for Henrik.
 
Henrik, no pressure mate....we are all just shitting on our hands waiting
for you :-)
 
George

-----Original Message-----
From: Alpesh [mailto:alpesh@cisco.com]
Sent: Friday, December 12, 2003 5:15 PM
To: Tsirtsis George
Cc: 'Kent Leung'; Henrik Levkowetz; mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
signment-02.txt


George -

Oh, don't get me wrong - I totally agree with both the suggestions and
understand them. We had been thinking
of a revision on similar sort a little before last IETF, but are holding for
Henrik's draft to come out :)

Alpesh

Tsirtsis George wrote:


I am suggesting two things:
 
1) Allow the HA to send a positive RREP with an optional HA redirection
extensions. This will allow a MN to change to the new HA at a time that is
convenient to it i.e.: when it is idle and thus sessions will not be
interrupted
 
2) Allow the HA to send a negative RREP with a compulsory HA redirection
extensions. This will allow an HA to offload a MN for whatever reason to
another HA (with which it may or may not share state)
 
Suggestion (1) above does not cause any session interruption and I sense
that you guys are ok with? Suggestion (2) may cause session interruption and
at least Henrik was not a big fan of this.
 
Henrik's draft, if I understand this correctly, allows HA redirection at any
time but only between HAs that *share* state.
 
The kulkarni draft also allows for HA redirection during initial
registration as it has already been stated
 
Is this making any sense? :-)
 
George

-----Original Message-----
From: Alpesh [ mailto:alpesh@cisco.com <mailto:alpesh@cisco.com> ]
Sent: Friday, December 12, 2003 4:26 PM
To: Tsirtsis George
Cc: 'Kent Leung'; Henrik Levkowetz; mip4@ietf.org <mailto:mip4@ietf.org> 
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
signment-02.txt


George -

Yes, but the 'redirection' was intended to happen during the initial
registration. With little extension/
expansion of interpretation of the text we can accomodate the 'in-session'
redirection/reanchoring
that you suggest. But that would break the session. Henrik's draft would
achieve reanchoring without
losing session - probably both methods can be supported?? 

Alpesh

Tsirtsis George wrote:


But the draft clearly *also* talks about redirection for the purpose of

routing optimality....mind you I think this is a good thing :-)



George

-----Original Message-----

From: Kent Leung [ mailto:kleung@cisco.com <mailto:kleung@cisco.com> ]

Sent: Friday, December 12, 2003 3:57 PM

To: Henrik Levkowetz

Cc: Tsirtsis George; Tsirtsis George;  mip4@ietf.org <mailto:mip4@ietf.org> 

Subject: Re: [Mip4] WG adoption call on

draft-kulkarni-mobileip-dynamic-as signment-02.txt





Right, the solution provided in this draft is for dynamically assigning

an HA for initial registration.  The mechanism allows the network to

choose an HA when MN request with AZOA or notify the MN the assigned

HA when MN request an administratively prohibited HA in RRQ.



Kent



At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:

  

On Friday, 12 Dec 2003, George Tsirtsis wrote:



    

The discussion was, however, about redirection to an HA that does not

necessarily share any state with the current HA.

      

<chair hat off>

  Ok. It wasn't clear to me at first that this was what you desired,

  rather than what you thought you at best could get...

</chair hat off>



    

The question is whether

such redirection should only be optional or whether optional and

      

compulsory

  

redirection should be allowed....(I prefer the latter).

      

<chair hat on>

  From the viewpoint of the problem the dyn-assignment draft originally

  aimed to solve, only dynamic assignment at the start of a session was

  considered and seemed to make sense.



  If we are now talking about extending this to a mechanism which will

  break off a session, but include a next-ha in the RRP refusal, I think

  we need to make sure we have a constituency which needs such a thing,

  and we have to weigh the benefits against the drawbacks of having

  a re-assignment mechanism which breaks off the current session.

</chair hat on>



<chair hat off>

  If we're going to have a mechanism to refuse a re-registration with

  a pointer to another HA, I'd prefer to be able to have it both

  optional and compulsory, as you seem to prefer too. But I'm not

  quite sure if the benefits in reduced round-trips of such a solution

  outweigh the simplicity of the HA simply refusing a registration, and

  the MN subsequently trying to register a new session and at that time

  be assigned a new HA, according to the mechanism of the current draft.

  Possibly it does.

</chair hat off>



    

Non of this seems to me to be affecting your draft as you describe 

      

below but

    

I will wait for it to come out so I can get the full picture of what is

being proposed.

      

<chair hat off>

  Fair enough.

</chair hat off>



        Henrik

    



  




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<DIV><SPAN class=028542617-12122003><FONT face=Arial color=#0000ff size=2>Ack, 
lets wait for Henrik.</FONT></SPAN></DIV>
<DIV><SPAN class=028542617-12122003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=028542617-12122003><FONT face=Arial color=#0000ff 
size=2>Henrik, no pressure mate....we are all just shitting on our hands waiting 
for you :-)</FONT></SPAN></DIV>
<DIV><SPAN class=028542617-12122003><FONT face=Arial color=#0000ff 
size=2></FONT></SPAN>&nbsp;</DIV>
<DIV><SPAN class=028542617-12122003><FONT face=Arial color=#0000ff 
size=2>George</FONT></SPAN></DIV>
<BLOCKQUOTE>
  <DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma 
  size=2>-----Original Message-----<BR><B>From:</B> Alpesh 
  [mailto:alpesh@cisco.com]<BR><B>Sent:</B> Friday, December 12, 2003 5:15 
  PM<BR><B>To:</B> Tsirtsis George<BR><B>Cc:</B> 'Kent Leung'; Henrik Levkowetz; 
  mip4@ietf.org<BR><B>Subject:</B> Re: [Mip4] WG adoption call on 
  draft-kulkarni-mobileip-dynamic-as signment-02.txt<BR><BR></FONT></DIV>George 
  -<BR><BR>Oh, don't get me wrong - I totally agree with both the suggestions 
  and understand them. We had been thinking<BR>of a revision on similar sort a 
  little before last IETF, but are holding for Henrik's draft to come out 
  :)<BR><BR>Alpesh<BR><BR>Tsirtsis George wrote:<BR>
  <BLOCKQUOTE 
  cite=mid9E3BA3946476AD4EB94672712B12A85F03AA80@ftmail.lab.flarion.com 
  type="cite">
    <META content="MSHTML 6.00.2800.1276" name=GENERATOR>
    <DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff size=2>I 
    am suggesting two things:</FONT></SPAN></DIV>
    <DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
    size=2></FONT></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff size=2>1) 
    Allow the HA to send a positive RREP with an optional HA redirection 
    extensions. This will allow a MN to change to the new HA at a time that is 
    convenient to it i.e.: when it is idle and thus sessions will not be 
    interrupted</FONT></SPAN></DIV>
    <DIV><SPAN class=517494716-12122003></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff size=2>2) 
    Allow the HA to send a negative RREP with a compulsory HA redirection 
    extensions. This will allow an HA to offload a MN for whatever reason to 
    another HA (with which it may or may not share state)</FONT></SPAN></DIV>
    <DIV><SPAN class=517494716-12122003></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
    size=2>Suggestion (1) above does not cause any session interruption and I 
    sense that you guys are ok with? Suggestion (2) may cause session 
    interruption and at least Henrik was not a big fan of 
    this.</FONT></SPAN></DIV>
    <DIV><SPAN class=517494716-12122003></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
    size=2>Henrik's draft, if I understand this correctly, allows HA redirection 
    at any time but only between HAs that *share* state.</FONT></SPAN></DIV>
    <DIV><SPAN class=517494716-12122003></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
    size=2>The kulkarni draft also allows for HA redirection during initial 
    registration as it has already been stated</FONT></SPAN></DIV>
    <DIV><SPAN class=517494716-12122003></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff size=2>Is 
    this making any sense? :-)</FONT></SPAN></DIV>
    <DIV><SPAN class=517494716-12122003></SPAN>&nbsp;</DIV>
    <DIV><SPAN class=517494716-12122003><FONT face=Arial color=#0000ff 
    size=2>George</FONT></SPAN></DIV>
    <BLOCKQUOTE>
      <DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma 
      size=2>-----Original Message-----<BR><B>From:</B> Alpesh [<A 
      class=moz-txt-link-freetext 
      href="mailto:alpesh@cisco.com">mailto:alpesh@cisco.com</A>]<BR><B>Sent:</B> 
      Friday, December 12, 2003 4:26 PM<BR><B>To:</B> Tsirtsis 
      George<BR><B>Cc:</B> 'Kent Leung'; Henrik Levkowetz; <A 
      class=moz-txt-link-abbreviated 
      href="mailto:mip4@ietf.org">mip4@ietf.org</A><BR><B>Subject:</B> Re: 
      [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as 
      signment-02.txt<BR><BR></FONT></DIV>George -<BR><BR>Yes, but the 
      'redirection' was intended to happen during the initial registration. With 
      little extension/<BR>expansion of interpretation of the text we can 
      accomodate the 'in-session' redirection/reanchoring<BR>that you suggest. 
      But that would break the session. Henrik's draft would achieve reanchoring 
      without<BR>losing session - probably both methods can be supported?? 
      <BR><BR>Alpesh<BR><BR>Tsirtsis George wrote:<BR>
      <BLOCKQUOTE 
      cite=mid9E3BA3946476AD4EB94672712B12A85F03AA7F@ftmail.lab.flarion.com 
      type="cite"><PRE wrap="">But the draft clearly *also* talks about redirection for the purpose of
routing optimality....mind you I think this is a good thing :-)

George
-----Original Message-----
From: Kent Leung [<A class=moz-txt-link-freetext href="mailto:kleung@cisco.com">mailto:kleung@cisco.com</A>]
Sent: Friday, December 12, 2003 3:57 PM
To: Henrik Levkowetz
Cc: Tsirtsis George; Tsirtsis George; <A class=moz-txt-link-abbreviated href="mailto:mip4@ietf.org">mip4@ietf.org</A>
Subject: Re: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-as signment-02.txt


Right, the solution provided in this draft is for dynamically assigning
an HA for initial registration.  The mechanism allows the network to
choose an HA when MN request with AZOA or notify the MN the assigned
HA when MN request an administratively prohibited HA in RRQ.

Kent

At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
  </PRE>
        <BLOCKQUOTE type="cite"><PRE wrap="">On Friday, 12 Dec 2003, George Tsirtsis wrote:

    </PRE>
          <BLOCKQUOTE type="cite"><PRE wrap="">The discussion was, however, about redirection to an HA that does not
necessarily share any state with the current HA.
      </PRE></BLOCKQUOTE><PRE wrap="">&lt;chair hat off&gt;
  Ok. It wasn't clear to me at first that this was what you desired,
  rather than what you thought you at best could get...
&lt;/chair hat off&gt;

    </PRE>
          <BLOCKQUOTE type="cite"><PRE wrap="">The question is whether
such redirection should only be optional or whether optional and
      </PRE></BLOCKQUOTE></BLOCKQUOTE><PRE wrap=""><!---->compulsory
  </PRE>
        <BLOCKQUOTE type="cite">
          <BLOCKQUOTE type="cite"><PRE wrap="">redirection should be allowed....(I prefer the latter).
      </PRE></BLOCKQUOTE><PRE wrap="">&lt;chair hat on&gt;
  From the viewpoint of the problem the dyn-assignment draft originally
  aimed to solve, only dynamic assignment at the start of a session was
  considered and seemed to make sense.

  If we are now talking about extending this to a mechanism which will
  break off a session, but include a next-ha in the RRP refusal, I think
  we need to make sure we have a constituency which needs such a thing,
  and we have to weigh the benefits against the drawbacks of having
  a re-assignment mechanism which breaks off the current session.
&lt;/chair hat on&gt;

&lt;chair hat off&gt;
  If we're going to have a mechanism to refuse a re-registration with
  a pointer to another HA, I'd prefer to be able to have it both
  optional and compulsory, as you seem to prefer too. But I'm not
  quite sure if the benefits in reduced round-trips of such a solution
  outweigh the simplicity of the HA simply refusing a registration, and
  the MN subsequently trying to register a new session and at that time
  be assigned a new HA, according to the mechanism of the current draft.
  Possibly it does.
&lt;/chair hat off&gt;

    </PRE>
          <BLOCKQUOTE type="cite"><PRE wrap="">Non of this seems to me to be affecting your draft as you describe 
      </PRE></BLOCKQUOTE><PRE wrap="">below but
    </PRE>
          <BLOCKQUOTE type="cite"><PRE wrap="">I will wait for it to come out so I can get the full picture of what is
being proposed.
      </PRE></BLOCKQUOTE><PRE wrap="">&lt;chair hat off&gt;
  Fair enough.
&lt;/chair hat off&gt;

        Henrik
    </PRE></BLOCKQUOTE><PRE wrap=""><!---->
  </PRE></BLOCKQUOTE><BR></BLOCKQUOTE></BLOCKQUOTE><BR></BLOCKQUOTE></BODY></HTML>

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From: Henrik Levkowetz <henrik@levkowetz.com>
To: Tsirtsis George <G.Tsirtsis@flarion.com>
Cc: "'Alpesh'" <alpesh@cisco.com>, "'Kent Leung'" <kleung@cisco.com>,
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Hi George,

On Friday, 12 Dec 2003, George Tsirtsis wrote:

> I am suggesting two things:
>  
> 1) Allow the HA to send a positive RREP with an optional HA redirection
> extensions. This will allow a MN to change to the new HA at a time that is
> convenient to it i.e.: when it is idle and thus sessions will not be
> interrupted

But if the MN is idle it doesn't send RRQ and won't get a RRP anyway,
while as soon as it needs to leave idle and sends an initial RRQ it can
be dynamically assigned a new HA, no?

> 2) Allow the HA to send a negative RREP with a compulsory HA redirection
> extensions. This will allow an HA to offload a MN for whatever reason to
> another HA (with which it may or may not share state)

Yes, but it will only let you offload it at the time of re-registration,
not at an optional time.

>  
> Suggestion (1) above does not cause any session interruption and I sense
> that you guys are ok with? Suggestion (2) may cause session interruption and
> at least Henrik was not a big fan of this.

I'm undecided on this one at the moment.

> Henrik's draft, if I understand this correctly, allows HA redirection at any
> time but only between HAs that *share* state.

That was the intention. But as that mechanism requires a message originated
by the HA anyway, we might open it up for both cases...

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-----Original Message-----
From: Henrik Levkowetz [mailto:henrik@levkowetz.com]
Sent: Friday, December 12, 2003 5:43 PM
To: Tsirtsis George
Cc: 'Alpesh'; 'Kent Leung'; mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-as signment-02.txt


Hi George,

On Friday, 12 Dec 2003, George Tsirtsis wrote:

> I am suggesting two things:
>  
> 1) Allow the HA to send a positive RREP with an optional HA redirection
> extensions. This will allow a MN to change to the new HA at a time that is
> convenient to it i.e.: when it is idle and thus sessions will not be
> interrupted

But if the MN is idle it doesn't send RRQ and won't get a RRP anyway,
while as soon as it needs to leave idle and sends an initial RRQ it can
be dynamically assigned a new HA, no?

GT> Well, I assumed that RREQs are sent based on some timer expiring and are
orthogonal to any data traffic. What you describe seams to assume that you
return the dynamic HoA when you go idle and then request a new one when you
want to start a session.....I am not sure I like this but I guess it could
be done this way too.

> 2) Allow the HA to send a negative RREP with a compulsory HA redirection
> extensions. This will allow an HA to offload a MN for whatever reason to
> another HA (with which it may or may not share state)

Yes, but it will only let you offload it at the time of re-registration,
not at an optional time.


GT> Correct. This is not good enough for real load balancing. I guess this
is where your draft comes in.

>  
> Suggestion (1) above does not cause any session interruption and I sense
> that you guys are ok with? Suggestion (2) may cause session interruption
and
> at least Henrik was not a big fan of this.

I'm undecided on this one at the moment.

GT> OK, sorry for putting words in your mouth.

> Henrik's draft, if I understand this correctly, allows HA redirection at
any
> time but only between HAs that *share* state.

That was the intention. But as that mechanism requires a message originated
by the HA anyway, we might open it up for both cases...

GT> Ack.

George

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Date: Fri, 12 Dec 2003 19:05:03 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: Tsirtsis George <G.Tsirtsis@flarion.com>
Cc: "'Alpesh'" <alpesh@cisco.com>, "'Kent Leung'" <kleung@cisco.com>,
        mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
 signment-02.txt
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Hi Guys,

<chair hat off>

    It's Friday evening here, and I should have gone home an hour ago :)
but was held up in a coupld of other discussions.

As I mentioned in an earlier post, the mechanism is to let a HA signal
an MN that it is taking over responsibility for an ongoing session from
another HA. To me this has only made sense if the HA's can serve the
MN with the same home address; otherwise you'd get a broken session.

The HA's would be situated physically close, but with different routes
to the internet, to provide a greater redundancy than what you could
get with a pure VRRP or CARP solution.

I didn't intend at all to go into the area of HAs providing different
home addresses, as I felt that if that should be done at all (it's a
break against one of the fundamentals of Mobile IP that you're not at
a fixed well known home address any more) it should be done at session
start, not in the middle of a session.

But now it seems that we're potentially extending the area of interest
for both drafts to the point where they may overlap:

  * The dyn-assignment draft might be extended to send redirection
    RRPs back not only at session start, but also during an ongoing
    session

  * The upcoming re-assignment or redundancy draft could be extended
    to let an backup HA initiate a message not only when it serves
    the same home network, but also in the case where it would
    provide a new home address, and session disruption would follow
    but service could be maintained (after the disruption)

Do we need this? 

Do we need both mechanisms? 

It seems to me that the major difference between these convergent
functions is that in one case (good if you want to offload MNs to sister
HA's) the signal comes from the old serving HA, while in the other case
(good if you want to take over if a sister HA has failed) the signal
comes from the new HA.

	Henrik

</chair hat off>
	

On Friday, 12 Dec 2003, George Tsirtsis wrote:

> Ack, lets wait for Henrik.
>  
> Henrik, no pressure mate....we are all just shitting on our hands waiting
> for you :-)
>  
> George
> 
> -----Original Message-----
> From: Alpesh [mailto:alpesh@cisco.com]
> Sent: Friday, December 12, 2003 5:15 PM
> To: Tsirtsis George
> Cc: 'Kent Leung'; Henrik Levkowetz; mip4@ietf.org
> Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
> signment-02.txt
> 
> 
> George -
> 
> Oh, don't get me wrong - I totally agree with both the suggestions and
> understand them. We had been thinking
> of a revision on similar sort a little before last IETF, but are holding for
> Henrik's draft to come out :)
> 
> Alpesh
> 
> Tsirtsis George wrote:
> 
> 
> I am suggesting two things:
>  
> 1) Allow the HA to send a positive RREP with an optional HA redirection
> extensions. This will allow a MN to change to the new HA at a time that is
> convenient to it i.e.: when it is idle and thus sessions will not be
> interrupted
>  
> 2) Allow the HA to send a negative RREP with a compulsory HA redirection
> extensions. This will allow an HA to offload a MN for whatever reason to
> another HA (with which it may or may not share state)
>  
> Suggestion (1) above does not cause any session interruption and I sense
> that you guys are ok with? Suggestion (2) may cause session interruption and
> at least Henrik was not a big fan of this.
>  
> Henrik's draft, if I understand this correctly, allows HA redirection at any
> time but only between HAs that *share* state.
>  
> The kulkarni draft also allows for HA redirection during initial
> registration as it has already been stated
>  
> Is this making any sense? :-)
>  
> George
> 
> -----Original Message-----
> From: Alpesh [ mailto:alpesh@cisco.com <mailto:alpesh@cisco.com> ]
> Sent: Friday, December 12, 2003 4:26 PM
> To: Tsirtsis George
> Cc: 'Kent Leung'; Henrik Levkowetz; mip4@ietf.org <mailto:mip4@ietf.org> 
> Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
> signment-02.txt
> 
> 
> George -
> 
> Yes, but the 'redirection' was intended to happen during the initial
> registration. With little extension/
> expansion of interpretation of the text we can accomodate the 'in-session'
> redirection/reanchoring
> that you suggest. But that would break the session. Henrik's draft would
> achieve reanchoring without
> losing session - probably both methods can be supported?? 
> 
> Alpesh
> 
> Tsirtsis George wrote:
> 
> 
> But the draft clearly *also* talks about redirection for the purpose of
> 
> routing optimality....mind you I think this is a good thing :-)
> 
> 
> 
> George
> 
> -----Original Message-----
> 
> From: Kent Leung [ mailto:kleung@cisco.com <mailto:kleung@cisco.com> ]
> 
> Sent: Friday, December 12, 2003 3:57 PM
> 
> To: Henrik Levkowetz
> 
> Cc: Tsirtsis George; Tsirtsis George;  mip4@ietf.org <mailto:mip4@ietf.org> 
> 
> Subject: Re: [Mip4] WG adoption call on
> 
> draft-kulkarni-mobileip-dynamic-as signment-02.txt
> 
> 
> 
> 
> 
> Right, the solution provided in this draft is for dynamically assigning
> 
> an HA for initial registration.  The mechanism allows the network to
> 
> choose an HA when MN request with AZOA or notify the MN the assigned
> 
> HA when MN request an administratively prohibited HA in RRQ.
> 
> 
> 
> Kent
> 
> 
> 
> At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
> 
>   
> 
> On Friday, 12 Dec 2003, George Tsirtsis wrote:
> 
> 
> 
>     
> 
> The discussion was, however, about redirection to an HA that does not
> 
> necessarily share any state with the current HA.
> 
>       
> 
> <chair hat off>
> 
>   Ok. It wasn't clear to me at first that this was what you desired,
> 
>   rather than what you thought you at best could get...
> 
> </chair hat off>
> 
> 
> 
>     
> 
> The question is whether
> 
> such redirection should only be optional or whether optional and
> 
>       
> 
> compulsory
> 
>   
> 
> redirection should be allowed....(I prefer the latter).
> 
>       
> 
> <chair hat on>
> 
>   From the viewpoint of the problem the dyn-assignment draft originally
> 
>   aimed to solve, only dynamic assignment at the start of a session was
> 
>   considered and seemed to make sense.
> 
> 
> 
>   If we are now talking about extending this to a mechanism which will
> 
>   break off a session, but include a next-ha in the RRP refusal, I think
> 
>   we need to make sure we have a constituency which needs such a thing,
> 
>   and we have to weigh the benefits against the drawbacks of having
> 
>   a re-assignment mechanism which breaks off the current session.
> 
> </chair hat on>
> 
> 
> 
> <chair hat off>
> 
>   If we're going to have a mechanism to refuse a re-registration with
> 
>   a pointer to another HA, I'd prefer to be able to have it both
> 
>   optional and compulsory, as you seem to prefer too. But I'm not
> 
>   quite sure if the benefits in reduced round-trips of such a solution
> 
>   outweigh the simplicity of the HA simply refusing a registration, and
> 
>   the MN subsequently trying to register a new session and at that time
> 
>   be assigned a new HA, according to the mechanism of the current draft.
> 
>   Possibly it does.
> 
> </chair hat off>
> 
> 
> 
>     
> 
> Non of this seems to me to be affecting your draft as you describe 
> 
>       
> 
> below but
> 
>     
> 
> I will wait for it to come out so I can get the full picture of what is
> 
> being proposed.
> 
>       
> 
> <chair hat off>
> 
>   Fair enough.
> 
> </chair hat off>
> 
> 
> 
>         Henrik
> 
>     
> 
> 
> 
>   
> 
> 
> 
> 

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Date: Fri, 12 Dec 2003 19:14:41 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: Tsirtsis George <G.Tsirtsis@flarion.com>
Cc: Tsirtsis George <G.Tsirtsis@flarion.com>, "'Alpesh'" <alpesh@cisco.com>,
        "'Kent Leung'" <kleung@cisco.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
 signment-02.txt
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Hi again George and all,

On Friday, 12 Dec 2003, GeorgeTsirtsis wrote:

[...]
> > Hi George,
> > 
> > On Friday, 12 Dec 2003, George Tsirtsis wrote:
> > 
> > > I am suggesting two things:
> > >  
> > > 1) Allow the HA to send a positive RREP with an optional HA redirection
> > > extensions. This will allow a MN to change to the new HA at a time that is
> > > convenient to it i.e.: when it is idle and thus sessions will not be
> > > interrupted
> > 
> > But if the MN is idle it doesn't send RRQ and won't get a RRP anyway,
> > while as soon as it needs to leave idle and sends an initial RRQ it can
> > be dynamically assigned a new HA, no?
> 
> GT> Well, I assumed that RREQs are sent based on some timer expiring and are
> orthogonal to any data traffic. What you describe seams to assume that you
> return the dynamic HoA when you go idle and then request a new one when you
> want to start a session.....I am not sure I like this but I guess it could
> be done this way too.

Right, I see. I wasn't thinking of 'returning' the dynamic HA, on the
contrary I'd expect that the first HA contacted on a following initial
registration would be the most recently used HA. 

But I guess that in your network, you might have sessions which
stretch for days or weeks, as long as a user don't turn off his mobile;
and in that case it seems silly to sit around and wait for the next
session if you need to change HA.

> > > 2) Allow the HA to send a negative RREP with a compulsory HA redirection
> > > extensions. This will allow an HA to offload a MN for whatever reason to
> > > another HA (with which it may or may not share state)
> > 
> > Yes, but it will only let you offload it at the time of re-registration,
> > not at an optional time.
> > 
> 
> GT> Correct. This is not good enough for real load balancing. I guess this
> is where your draft comes in.

Yes, that's what I intended.

> >  
> > > Suggestion (1) above does not cause any session interruption and I sense
> > > that you guys are ok with? Suggestion (2) may cause session interruption
> > and
> > > at least Henrik was not a big fan of this.
> > 
> > I'm undecided on this one at the moment.
> > 
> GT> OK, sorry for putting words in your mouth.

No prob. 

> > > Henrik's draft, if I understand this correctly, allows HA redirection at
> > any
> > > time but only between HAs that *share* state.
> > 
> > That was the intention. But as that mechanism requires a message originated
> > by the HA anyway, we might open it up for both cases...
> > 
> GT> Ack.

Ok, let's see where we end up here.

	Regards,
		Henrik


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Date: Fri, 12 Dec 2003 12:56:07 -0600
From: Pete McCann <mccap@lucent.com>
To: Tsirtsis George <G.Tsirtsis@flarion.com>
Cc: "'Alpesh'" <alpesh@cisco.com>, "'Kent Leung'" <kleung@cisco.com>,
        Henrik Levkowetz <henrik@levkowetz.com>, mip4@ietf.org
Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-assignment-02.txt
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George, I'm sure you didn't mean that exactly. :)

Anyway, I wonder why the HA is in a good position to do a redirect to
a "more local" HA, especially because the two HAs are by definition
not local to each other and are likely to be in different
administrative domains.

Instead, it seems like the MN could implement some policy for shifting
its HA, based on information about the domain to which it is connected
(FA NAI?) and the existence of any local sessions.  Note that "local
sessions" may include low-traffic TCP connections (terminal shells)
which it may be difficult or impossible for the HA to detect.

When no local sessions exist, the MN could request the assignment of a
new HA based on the existing draft.  It could even leave its existing
registration in place for a period of time if it wanted to overlap the
two registrations.

Load balancing/failover (within the same location/administrative
domain) might be a better motivation for redirecting an in-progress
session.  However, it is possible to solve at least some aspects of
this problem without any new protocol changes to Mobile IP, see, e.g.:

  http://www.cs.wustl.edu/cs/techreports/1998/wucs-98-11.ps.Z

-Pete

Tsirtsis George writes:
 > Ack, lets wait for Henrik.
 >  
 > Henrik, no pressure mate....we are all just shitting on our hands waiting
 > for you :-)
 >  
 > George
 > 
 > -----Original Message-----
 > From: Alpesh [mailto:alpesh@cisco.com]
 > Sent: Friday, December 12, 2003 5:15 PM
 > To: Tsirtsis George
 > Cc: 'Kent Leung'; Henrik Levkowetz; mip4@ietf.org
 > Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
 > signment-02.txt
 > 
 > 
 > George -
 > 
 > Oh, don't get me wrong - I totally agree with both the suggestions and
 > understand them. We had been thinking
 > of a revision on similar sort a little before last IETF, but are holding for
 > Henrik's draft to come out :)
 > 
 > Alpesh
 > 
 > Tsirtsis George wrote:
 > 
 > 
 > I am suggesting two things:
 >  
 > 1) Allow the HA to send a positive RREP with an optional HA redirection
 > extensions. This will allow a MN to change to the new HA at a time that is
 > convenient to it i.e.: when it is idle and thus sessions will not be
 > interrupted
 >  
 > 2) Allow the HA to send a negative RREP with a compulsory HA redirection
 > extensions. This will allow an HA to offload a MN for whatever reason to
 > another HA (with which it may or may not share state)
 >  
 > Suggestion (1) above does not cause any session interruption and I sense
 > that you guys are ok with? Suggestion (2) may cause session interruption and
 > at least Henrik was not a big fan of this.
 >  
 > Henrik's draft, if I understand this correctly, allows HA redirection at any
 > time but only between HAs that *share* state.
 >  
 > The kulkarni draft also allows for HA redirection during initial
 > registration as it has already been stated
 >  
 > Is this making any sense? :-)
 >  
 > George
 > 
 > -----Original Message-----
 > From: Alpesh [ mailto:alpesh@cisco.com <mailto:alpesh@cisco.com> ]
 > Sent: Friday, December 12, 2003 4:26 PM
 > To: Tsirtsis George
 > Cc: 'Kent Leung'; Henrik Levkowetz; mip4@ietf.org <mailto:mip4@ietf.org> 
 > Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
 > signment-02.txt
 > 
 > 
 > George -
 > 
 > Yes, but the 'redirection' was intended to happen during the initial
 > registration. With little extension/
 > expansion of interpretation of the text we can accomodate the 'in-session'
 > redirection/reanchoring
 > that you suggest. But that would break the session. Henrik's draft would
 > achieve reanchoring without
 > losing session - probably both methods can be supported?? 
 > 
 > Alpesh
 > 
 > Tsirtsis George wrote:
 > 
 > 
 > But the draft clearly *also* talks about redirection for the purpose of
 > 
 > routing optimality....mind you I think this is a good thing :-)
 > 
 > 
 > 
 > George
 > 
 > -----Original Message-----
 > 
 > From: Kent Leung [ mailto:kleung@cisco.com <mailto:kleung@cisco.com> ]
 > 
 > Sent: Friday, December 12, 2003 3:57 PM
 > 
 > To: Henrik Levkowetz
 > 
 > Cc: Tsirtsis George; Tsirtsis George;  mip4@ietf.org <mailto:mip4@ietf.org> 
 > 
 > Subject: Re: [Mip4] WG adoption call on
 > 
 > draft-kulkarni-mobileip-dynamic-as signment-02.txt
 > 
 > 
 > 
 > 
 > 
 > Right, the solution provided in this draft is for dynamically assigning
 > 
 > an HA for initial registration.  The mechanism allows the network to
 > 
 > choose an HA when MN request with AZOA or notify the MN the assigned
 > 
 > HA when MN request an administratively prohibited HA in RRQ.
 > 
 > 
 > 
 > Kent
 > 
 > 
 > 
 > At 04:40 PM 12/12/2003 +0100, Henrik Levkowetz wrote:
 > 
 >   
 > 
 > On Friday, 12 Dec 2003, George Tsirtsis wrote:
 > 
 > 
 > 
 >     
 > 
 > The discussion was, however, about redirection to an HA that does not
 > 
 > necessarily share any state with the current HA.
 > 
 >       
 > 
 > <chair hat off>
 > 
 >   Ok. It wasn't clear to me at first that this was what you desired,
 > 
 >   rather than what you thought you at best could get...
 > 
 > </chair hat off>
 > 
 > 
 > 
 >     
 > 
 > The question is whether
 > 
 > such redirection should only be optional or whether optional and
 > 
 >       
 > 
 > compulsory
 > 
 >   
 > 
 > redirection should be allowed....(I prefer the latter).
 > 
 >       
 > 
 > <chair hat on>
 > 
 >   From the viewpoint of the problem the dyn-assignment draft originally
 > 
 >   aimed to solve, only dynamic assignment at the start of a session was
 > 
 >   considered and seemed to make sense.
 > 
 > 
 > 
 >   If we are now talking about extending this to a mechanism which will
 > 
 >   break off a session, but include a next-ha in the RRP refusal, I think
 > 
 >   we need to make sure we have a constituency which needs such a thing,
 > 
 >   and we have to weigh the benefits against the drawbacks of having
 > 
 >   a re-assignment mechanism which breaks off the current session.
 > 
 > </chair hat on>
 > 
 > 
 > 
 > <chair hat off>
 > 
 >   If we're going to have a mechanism to refuse a re-registration with
 > 
 >   a pointer to another HA, I'd prefer to be able to have it both
 > 
 >   optional and compulsory, as you seem to prefer too. But I'm not
 > 
 >   quite sure if the benefits in reduced round-trips of such a solution
 > 
 >   outweigh the simplicity of the HA simply refusing a registration, and
 > 
 >   the MN subsequently trying to register a new session and at that time
 > 
 >   be assigned a new HA, according to the mechanism of the current draft.
 > 
 >   Possibly it does.
 > 
 > </chair hat off>
 > 
 > 
 > 
 >     
 > 
 > Non of this seems to me to be affecting your draft as you describe 
 > 
 >       
 > 
 > below but
 > 
 >     
 > 
 > I will wait for it to come out so I can get the full picture of what is
 > 
 > being proposed.
 > 
 >       
 > 
 > <chair hat off>
 > 
 >   Fair enough.
 > 
 > </chair hat off>
 > 
 > 
 > 
 >         Henrik




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From: Tsirtsis George <G.Tsirtsis@flarion.com>
To: "'Pete McCann'" <mccap@lucent.com>
Cc: "'Alpesh'" <alpesh@cisco.com>, "'Kent Leung'" <kleung@cisco.com>,
        Henrik Levkowetz <henrik@levkowetz.com>, mip4@ietf.org
Subject: RE: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
	signment-02.txt
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inline

-----Original Message-----
From: Pete McCann [mailto:mccap@lucent.com]
Sent: Friday, December 12, 2003 6:56 PM
To: Tsirtsis George
Cc: 'Alpesh'; 'Kent Leung'; Henrik Levkowetz; mip4@ietf.org
Subject: RE: [Mip4] WG adoption call on
draft-kulkarni-mobileip-dynamic-assignment-02.txt



George, I'm sure you didn't mean that exactly. :)

GT> just joking :-)

Anyway, I wonder why the HA is in a good position to do a redirect to
a "more local" HA, especially because the two HAs are by definition
not local to each other and are likely to be in different
administrative domains.

GT> Whether the HAs are in same or different administrative domains is a
matter of deployment. In my day job I am dealing with wide area Mobile IP
deployments and as such it is very possible that clusters of HAs are serving
different geographical areas under the same administrative domain.


Instead, it seems like the MN could implement some policy for shifting
its HA, based on information about the domain to which it is connected
(FA NAI?) and the existence of any local sessions.  Note that "local
sessions" may include low-traffic TCP connections (terminal shells)
which it may be difficult or impossible for the HA to detect.

GT> Thus I think redirection should most of the time be optional/

When no local sessions exist, the MN could request the assignment of a
new HA based on the existing draft.  It could even leave its existing
registration in place for a period of time if it wanted to overlap the
two registrations.

GT> Well, my point is that it might not be possible for the mobile to know
that it would be a good idea to redirect. Anyway, I am trying to make a
logical point in this case but I do not see this as a major requirement in
the real world at least as far as I can see. To make that clear, in the part
of the real world that I am dealing with the mobile is in a position to know
when it is time to choose another HA and thus to optimize its routing. 

GT> As an engineer, however, I see that in the general case it might be the
case that the HA knows the topology better than the mobile. Generally
speaking operators do not like end points to know a lot about the topology
of the network (and NAIs are not always advertised by FAs and are not
available when CCoAs are used). The HA, however, IS part of the topology so
an operator may configure such info in the HAs. 

GT> Anyway, I am not going to defend this idea for too much longer :-)

George

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Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-assignment-02.txt
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Pete McCann wrote:
> Anyway, I wonder why the HA is in a good position to do a redirect to
>  a "more local" HA, especially because the two HAs are by definition 
> not local to each other and are likely to be in different 
> administrative domains.

I have the same doubt, among others.

> Load balancing/failover (within the same location/administrative 
> domain) might be a better motivation for redirecting an in-progress 
> session.  However, it is possible to solve at least some aspects of 
> this problem without any new protocol changes to Mobile IP, see, 
> e.g.:
> 
> http://www.cs.wustl.edu/cs/techreports/1998/wucs-98-11.ps.Z

Thanks for the reference.

I think it is also possible to achieve a certain degree of load
balancing by assigning two HA's on the same link the same IP address, at
least with CARP.  I do not think there is any problem in achieving load
balancing for HA in this way.

Alex


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Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
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Tsirtsis George wrote:
> A little bit more thought should be put into redirection from one 
> assigned HA to another. This is the case where a MN is registered 
> with HAx and potentially has active sessions based on the assigned 
> HoAx. Based on section 4.2.2, HAx may for example detect that the MN
>  is moving too far away from HAx and closer to HAy. HAx can then 
> reject the next RREQ from the MN with a REDIRECTED-HA-ADDRESS 
> Extension pointing to HAy.

In case HAx and HAy are on the same link, another possibility might be
for HAx to send an ICMP redirect through the tunnel to MH instructing it
of the better HAy.

> One way to avoid this is to introduce a flag that specifies the 
> redirection as optional or compulsory. If it is optional the MN 
> should be able to stay with HAx for a while longer (e.g.: until 
> current sessions stop and MN is idle). This may also require the 
> REDIRECTED-HA-ADDRESS Extension (with flag=optional) to be attached 
> to positive RREP rather than rejections. If, however, flag=compulsory
>  (due to policy or other reasons) then the MN will have to register 
> with HAy immediately per current draft and REDIRECTED-HA-ADDRESS 
> Extensions will be attached to a reject RREP.

If HAx sends a compulsory message to MH such as MH is forced to end its
sessions and anchor to HAy, I think there is no need for this compulsory
message.  I think MH has more information about its present location
being closer to HAy (than to HAx) and can take that decision itself, no
need to exchange compulsory messages with HAx.  My oppinion is.

Alex


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Date: Fri, 12 Dec 2003 20:55:56 +0100
From: Alexandru Petrescu <petrescu@nal.motlabs.com>
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To: Tsirtsis George <G.Tsirtsis@flarion.com>
Cc: "'Henrik Levkowetz'" <henrik@levkowetz.com>,
        "'Kent Leung'" <kleung@cisco.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
  signment-02.txt
References: <9E3BA3946476AD4EB94672712B12A85F03AA78@ftmail.lab.flarion.com>
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Tsirtsis George wrote:
> I think, however, that it is worth letting the HA redirect a mobile
> in a compulsory way (HA sends HA redirect in negative RREP) if that
> is what needs to be done from network perspective (e.g.: topology
> reasons, overloading etc).

If it is worth considering that the network indicates the MH what to do
and how to do it, then there are some other additional proposals,
draft-lach-nac-* being one and there were many others in the past.

Alex


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Date: Fri, 12 Dec 2003 21:45:56 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: Alexandru Petrescu <petrescu@nal.motlabs.com>
Cc: Pete McCann <mccap@lucent.com>, Tsirtsis George
 <G.Tsirtsis@flarion.com>,
        "'Alpesh'" <alpesh@cisco.com>, "'Kent Leung'"
 <kleung@cisco.com>,
        mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on
 draft-kulkarni-mobileip-dynamic-assignment-02.txt
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Friday 12 December 2003, Alexandru wrote:
> > Load balancing/failover (within the same location/administrative 
> > domain) might be a better motivation for redirecting an in-progress 
> > session.  However, it is possible to solve at least some aspects of 
> > this problem without any new protocol changes to Mobile IP, see, 
> > e.g.:
> > 
> > http://www.cs.wustl.edu/cs/techreports/1998/wucs-98-11.ps.Z
> 
> Thanks for the reference.
> 
> I think it is also possible to achieve a certain degree of load
> balancing by assigning two HA's on the same link the same IP address, at
> least with CARP.  I do not think there is any problem in achieving load
> balancing for HA in this way.

Not a problem, but remember you still have to arrange to have registration
requests to be forwarded between the two HA's, but only replied to by one
of them. CARP (or VRRP) won't take care of that for you.

	Henrik

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From: Henrik Levkowetz <henrik@levkowetz.com>
To: Alexandru Petrescu <petrescu@nal.motlabs.com>
Cc: Tsirtsis George <G.Tsirtsis@flarion.com>, "'Alpesh'" <alpesh@cisco.com>,
        "'Kent Leung'" <kleung@cisco.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on draft-kulkarni-mobileip-dynamic-as
 signment-02.txt
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Friday 12 December 2003, Alexandru wrote:
> Henrik Levkowetz wrote:
> > The HA's would be situated physically close, but with different 
> > routes to the internet, to provide a greater redundancy than what you
> >  could get with a pure VRRP or CARP solution.
> 
> I don't think that CARP requires the HA's to have same unique route to
> the Internet.  In my understanding it's just required the two hosts to
> have a common link such that ARP works on that common link.

VRRP and CARP lets one box take over and operate on the address of the
other box, catching remote and local registrations at that address. If
the MN is going to route it's RRQs to a completely different address, 
which is routed through other paths, you'll need something in addition
to - or instead of - CARP. 

	Henrik


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 signment-02.txt
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Henrik Levkowetz wrote:
> The HA's would be situated physically close, but with different 
> routes to the internet, to provide a greater redundancy than what you
>  could get with a pure VRRP or CARP solution.

I don't think that CARP requires the HA's to have same unique route to
the Internet.  In my understanding it's just required the two hosts to
have a common link such that ARP works on that common link.

Alex


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Date: Fri, 12 Dec 2003 21:57:24 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: Pete McCann <mccap@lucent.com>
Cc: Tsirtsis George <G.Tsirtsis@flarion.com>, "'Alpesh'" <alpesh@cisco.com>,
        "'Kent Leung'" <kleung@cisco.com>, mip4@ietf.org
Subject: Re: [Mip4] WG adoption call on
 draft-kulkarni-mobileip-dynamic-assignment-02.txt
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Friday 12 December 2003, Pete wrote:
> Load balancing/failover (within the same location/administrative
> domain) might be a better motivation for redirecting an in-progress
> session.  However, it is possible to solve at least some aspects of
> this problem without any new protocol changes to Mobile IP, see, e.g.:
> 
>   http://www.cs.wustl.edu/cs/techreports/1998/wucs-98-11.ps.Z

Yes, this is an implementation with the same characteristics as the
VRRP / CARP based solutions I was talking about earlier. I didn't
know of this particular reference, but have looked at HARP earlier.

	Henrik

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Henrik Levkowetz wrote:
> Friday 12 December 2003, Alexandru wrote:
> 
>>> Load balancing/failover (within the same location/administrative 
>>> domain) might be a better motivation for redirecting an 
>>> in-progress session.  However, it is possible to solve at least 
>>> some aspects of this problem without any new protocol changes to 
>>> Mobile IP, see, e.g.:
>>> 
>>> http://www.cs.wustl.edu/cs/techreports/1998/wucs-98-11.ps.Z
>> 
>> Thanks for the reference.
>> 
>> I think it is also possible to achieve a certain degree of load 
>> balancing by assigning two HA's on the same link the same IP 
>> address, at least with CARP.  I do not think there is any problem 
>> in achieving load balancing for HA in this way.
> 
> Not a problem, but remember you still have to arrange to have 
> registration requests to be forwarded between the two HA's, but only 
> replied to by one of them.

Ah yes, that is right.  I only thought about fault tolerance in fact,
where if one HA goes down (so not sending any more replies) there will
be one other HA staying up.  The way those two HA's have their data
synchronized is by "disk mirroring" I've seen.

With HA off-loading an MH to another HA, it is indeed different and new
registrations would be needed.

Alex


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Subject: [Mip4] Call for participation: ICMU2004 Jan.8-9 at Yokosuka Japan
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         (Apologies if you receive multiple copies)
                    CALL FOR Participation
                    ======================
           First International Conference 
   on Mobile Computing and Ubiquitous Networking (ICMU 2004) 

        January 8 and 9, 2004
        NTT DoCoMo R&D Center, Yokosuka Research Park, Yokosuka, JAPAN

	Co-sponsored by IPSJ SIG-MBL (Informaiton Processing Society
	of Japan, Special Interest Group of Mobile Computing and
	Ubiquitous Networking) and IPSJ SG-BCC (Study Group of
	Broadcast Communicaiton and Computing) 

Advanced Program:
~~~~~~~~~~~~~~~~~
        See http://www.ipsj.or.jp/sig/mbl/icmu2004/

Scope
~~~~~~
Mobile computing aims at ubiquitous user access to computer 
application. To make it possible, networking technology which enables 
Internet access anytime and everywhere, i.e. ubiquitous networking is 
necessary. It is obvious that with the accelerating trends towards 
mobile networks, ad-hoc networks, and wireless networks, mobile 
computing and ubiquitous networking will play an important role in 
future network. This conference is aimed at providing researchers and 
practitioners in this hot research area a forum for discussion and 
collaboration. Authors are invited to submit papers addressing, but 
not limited to, the following topics:

 -  Applications and services for mobile computing 
 - Network architectures, protocols, or service models for ubiquitous
   networking 
 - Network management for ubiquitous networking 
 - Data management for mobile computing 
 - Security in mobile computing and ubiquitous networking 
 - Wireless and mobile communications 
 - Nomadic computing 
 - Ad-hoc networks 
 - Mobile Internetworking 
 - Performance evaluation for mobile computing and ubiquitous 
   networking systems 
 - Location Based Service 
 - Broadcast Communication 

Location and Date:
~~~~~~~~~~~~~~~~~~
The location of the NTT DoCoMo R&D Center is in the heart of Yokosuka
Research Park(YRP) where a lot of wireless communication related
research institutes are established. YRP is really the heart of
wireless communications research in Japan. Japanese old city Kamakura,
a famous historic city, is 30 minutes by train. Beginning of the year
is one of the best seasons for visiting Japan.  

---
Susumu ISHIHARA
  Faculty of Engineering, Shizuoka University
  3-5-1 Johoku, Hamamatsu 432-8561, JAPAN
  ishiahra@ishilab.net   http://www.ishilab.net/



         (Apologies if you receive multiple copies)
                    CALL FOR Participation
                    ======================
           First International Conference 
   on Mobile Computing and Ubiquitous Networking (ICMU 2004) 

        January 8 and 9, 2004
        NTT DoCoMo R&D Center, Yokosuka Research Park, Yokosuka, JAPAN

	Co-sponsored by IPSJ SIG-MBL (Informaiton Processing Society
	of Japan, Special Interest Group of Mobile Computing and
	Ubiquitous Networking) and IPSJ SG-BCC (Study Group of
	Broadcast Communicaiton and Computing) 

Advanced Program:
~~~~~~~~~~~~~~~~~
        See http://www.ipsj.or.jp/sig/mbl/icmu2004/

Scope
~~~~~~
Mobile computing aims at ubiquitous user access to computer 
application. To make it possible, networking technology which enables 
Internet access anytime and everywhere, i.e. ubiquitous networking is 
necessary. It is obvious that with the accelerating trends towards 
mobile networks, ad-hoc networks, and wireless networks, mobile 
computing and ubiquitous networking will play an important role in 
future network. This conference is aimed at providing researchers and 
practitioners in this hot research area a forum for discussion and 
collaboration. Authors are invited to submit papers addressing, but 
not limited to, the following topics:

 -  Applications and services for mobile computing 
 - Network architectures, protocols, or service models for ubiquitous
   networking 
 - Network management for ubiquitous networking 
 - Data management for mobile computing 
 - Security in mobile computing and ubiquitous networking 
 - Wireless and mobile communications 
 - Nomadic computing 
 - Ad-hoc networks 
 - Mobile Internetworking 
 - Performance evaluation for mobile computing and ubiquitous 
   networking systems 
 - Location Based Service 
 - Broadcast Communication 

Location and Date:
~~~~~~~~~~~~~~~~~~
The location of the NTT DoCoMo R&D Center is in the heart of Yokosuka
Research Park(YRP) where a lot of wireless communication related
research institutes are established. YRP is really the heart of
wireless communications research in Japan. Japanese old city Kamakura,
a famous historic city, is 30 minutes by train. Beginning of the year
is one of the best seasons for visiting Japan.  

---
Susumu ISHIHARA
  Faculty of Engineering, Shizuoka University
  3-5-1 Johoku, Hamamatsu 432-8561, JAPAN
  ishiahra@ishilab.net   http://www.ishilab.net/





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From exim@www1.ietf.org  Sun Dec 14 19:31:33 2003
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Subject: [Mip4] Call for participation: ICMU2004 Jan.8-9 at Yokosuka Japan
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         (Apologies if you receive multiple copies)
                    CALL FOR Participation
                    ======================
           First International Conference 
   on Mobile Computing and Ubiquitous Networking (ICMU 2004) 

        January 8 and 9, 2004
        NTT DoCoMo R&D Center, Yokosuka Research Park, Yokosuka, JAPAN

	Co-sponsored by IPSJ SIG-MBL (Informaiton Processing Society
	of Japan, Special Interest Group of Mobile Computing and
	Ubiquitous Networking) and IPSJ SG-BCC (Study Group of
	Broadcast Communicaiton and Computing) 

Advanced Program:
~~~~~~~~~~~~~~~~~
        See http://www.ipsj.or.jp/sig/mbl/icmu2004/

Scope
~~~~~~
Mobile computing aims at ubiquitous user access to computer 
application. To make it possible, networking technology which enables 
Internet access anytime and everywhere, i.e. ubiquitous networking is 
necessary. It is obvious that with the accelerating trends towards 
mobile networks, ad-hoc networks, and wireless networks, mobile 
computing and ubiquitous networking will play an important role in 
future network. This conference is aimed at providing researchers and 
practitioners in this hot research area a forum for discussion and 
collaboration. Authors are invited to submit papers addressing, but 
not limited to, the following topics:

 -  Applications and services for mobile computing 
 - Network architectures, protocols, or service models for ubiquitous
   networking 
 - Network management for ubiquitous networking 
 - Data management for mobile computing 
 - Security in mobile computing and ubiquitous networking 
 - Wireless and mobile communications 
 - Nomadic computing 
 - Ad-hoc networks 
 - Mobile Internetworking 
 - Performance evaluation for mobile computing and ubiquitous 
   networking systems 
 - Location Based Service 
 - Broadcast Communication 

Location and Date:
~~~~~~~~~~~~~~~~~~
The location of the NTT DoCoMo R&D Center is in the heart of Yokosuka
Research Park(YRP) where a lot of wireless communication related
research institutes are established. YRP is really the heart of
wireless communications research in Japan. Japanese old city Kamakura,
a famous historic city, is 30 minutes by train. Beginning of the year
is one of the best seasons for visiting Japan.  

---
Susumu ISHIHARA
  Faculty of Engineering, Shizuoka University
  3-5-1 Johoku, Hamamatsu 432-8561, JAPAN
  ishiahra@ishilab.net   http://www.ishilab.net/



         (Apologies if you receive multiple copies)
                    CALL FOR Participation
                    ======================
           First International Conference 
   on Mobile Computing and Ubiquitous Networking (ICMU 2004) 

        January 8 and 9, 2004
        NTT DoCoMo R&D Center, Yokosuka Research Park, Yokosuka, JAPAN

	Co-sponsored by IPSJ SIG-MBL (Informaiton Processing Society
	of Japan, Special Interest Group of Mobile Computing and
	Ubiquitous Networking) and IPSJ SG-BCC (Study Group of
	Broadcast Communicaiton and Computing) 

Advanced Program:
~~~~~~~~~~~~~~~~~
        See http://www.ipsj.or.jp/sig/mbl/icmu2004/

Scope
~~~~~~
Mobile computing aims at ubiquitous user access to computer 
application. To make it possible, networking technology which enables 
Internet access anytime and everywhere, i.e. ubiquitous networking is 
necessary. It is obvious that with the accelerating trends towards 
mobile networks, ad-hoc networks, and wireless networks, mobile 
computing and ubiquitous networking will play an important role in 
future network. This conference is aimed at providing researchers and 
practitioners in this hot research area a forum for discussion and 
collaboration. Authors are invited to submit papers addressing, but 
not limited to, the following topics:

 -  Applications and services for mobile computing 
 - Network architectures, protocols, or service models for ubiquitous
   networking 
 - Network management for ubiquitous networking 
 - Data management for mobile computing 
 - Security in mobile computing and ubiquitous networking 
 - Wireless and mobile communications 
 - Nomadic computing 
 - Ad-hoc networks 
 - Mobile Internetworking 
 - Performance evaluation for mobile computing and ubiquitous 
   networking systems 
 - Location Based Service 
 - Broadcast Communication 

Location and Date:
~~~~~~~~~~~~~~~~~~
The location of the NTT DoCoMo R&D Center is in the heart of Yokosuka
Research Park(YRP) where a lot of wireless communication related
research institutes are established. YRP is really the heart of
wireless communications research in Japan. Japanese old city Kamakura,
a famous historic city, is 30 minutes by train. Beginning of the year
is one of the best seasons for visiting Japan.  

---
Susumu ISHIHARA
  Faculty of Engineering, Shizuoka University
  3-5-1 Johoku, Hamamatsu 432-8561, JAPAN
  ishiahra@ishilab.net   http://www.ishilab.net/




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Subject: [Mip4] Book Announcement
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Hi,

I thought the members of this mailing list would be interested in the 
following book. For more information, please visit 
http://www.wkap.nl/prod/b/0-306-47874-9.

Best Regards,
Sakib


Mobile IP: Present State and Future
Abdul Sakib Mondal

Mobile IP: Present State and Future is an up-to-date introduction to the 
rapidly evolving field of mobile IP. In addition to detailed coverage of 
motivation behind mobile IP and fundamental concepts of mobile IP like agent 
advertisement and discovery, registration and tunneling, the book provides a 
comprehensive treatment of various associated technical issues such as 
security, TCP performance, multicasting and integration with wireless. The 
book has been written to serve as a text for network professionals who are 
yearning to acquire a clear understanding of this interesting field. It also 
covers ongoing research on possible ways to mitigate the challenges and 
issues associated with mobile IP. This makes the book a good reference for 
advanced readers as well as researchers in the field. Network system 
developers and administrators will find this book useful due to discussions 
on applications of mobile IP in the real world, and management of mobile IP. 
Last but not least, the book delineates possible future directions of mobile 
IP, a topic that will be of interest to a large section of network 
professionals and researchers. The book contains a large number of examples, 
illustrations and notes to make the presentation simple and interesting. The 
book should be relevant for courses on advanced networking, mobile computing 
and similar topics.

_________________________________________________________________
Marriage? http://www.bharatmatrimony.com/cgi-bin/bmclicks1.cgi?74 Join 
BharatMatrimony.com for free.


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From: Internet-Drafts@ietf.org
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Date: Tue, 16 Dec 2003 16:02:15 -0500
Subject: [Mip4] I-D ACTION:draft-ietf-mip4-aaa-nai-02.txt
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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Mobility for IPv4 Working Group of the IETF.

	Title		: Mobile IPv4 Extension for AAA Network Access Identifiers
	Author(s)	: F. Johansson, T. Johansson
	Filename	: draft-ietf-mip4-aaa-nai-02.txt
	Pages		: 10
	Date		: 2003-12-16
	
When a mobile node moves between two foreign networks it has to be
reauthenticated.  If the home network has multiple Authentication
Authorization and Accounting (AAA) servers the reauthentication
request may not be received by the same Home AAA server as previous
authentication requests.  In order for the new Home AAA server to be
able to forward the request to the correct Home Agent it has to know
the identity of the Home Agent.  This document defines a Mobile IP
extension that enables the HA to pass its identity to the mobile node
which can then pass it on to the new AAA server when changing point
of attachment.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-mip4-aaa-nai-02.txt

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From: Tsirtsis George <G.Tsirtsis@flarion.com>
To: mip4@ietf.org
Subject: RE: [Mip4] I-D ACTION:draft-ietf-mip4-aaa-nai-02.txt
Date: Tue, 16 Dec 2003 16:48:12 -0500
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I am a bit confused about the intention of this document. Could someone give
me an example of how it can be used?
I apologize in advance if this has been discussed recently.

Thanks
George

-----Original Message-----
From: mip4-admin@ietf.org [mailto:mip4-admin@ietf.org]On Behalf Of
Internet-Drafts@ietf.org
Sent: Tuesday, December 16, 2003 4:02 PM
Cc: mip4@ietf.org
Subject: [Mip4] I-D ACTION:draft-ietf-mip4-aaa-nai-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Mobility for IPv4 Working Group of the
IETF.

	Title		: Mobile IPv4 Extension for AAA Network Access
Identifiers
	Author(s)	: F. Johansson, T. Johansson
	Filename	: draft-ietf-mip4-aaa-nai-02.txt
	Pages		: 10
	Date		: 2003-12-16
	
When a mobile node moves between two foreign networks it has to be
reauthenticated.  If the home network has multiple Authentication
Authorization and Accounting (AAA) servers the reauthentication
request may not be received by the same Home AAA server as previous
authentication requests.  In order for the new Home AAA server to be
able to forward the request to the correct Home Agent it has to know
the identity of the Home Agent.  This document defines a Mobile IP
extension that enables the HA to pass its identity to the mobile node
which can then pass it on to the new AAA server when changing point
of attachment.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-mip4-aaa-nai-02.txt

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From exim@www1.ietf.org  Tue Dec 16 17:16:31 2003
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Date: Tue, 16 Dec 2003 23:15:02 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
To: Tsirtsis George <G.Tsirtsis@flarion.com>
Cc: mip4@ietf.org
Subject: Re: [Mip4] I-D ACTION:draft-ietf-mip4-aaa-nai-02.txt
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Hi George,

Tuesday 16 December 2003, Tsirtsis George wrote:
> I am a bit confused about the intention of this document. Could someone give
> me an example of how it can be used?
> I apologize in advance if this has been discussed recently.

The original motivation for this document was that the extension and
sub-types it defined was needed for the diameter mobile-ip application;
it is referenced by the diameter mobile-ip draft and needed to complete
it.

(It would also be possible to use this extension to provide HA and AAAH
NAIs for use with vendor-specific RADIUS AVPs.)

In response to feedback at the time of WG last call, the specification
was generalised so that it is not strictly limiting to be an AAA-NAI
carrying extension.

Does this answer your question?

	Henrik

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From exim@www1.ietf.org  Tue Dec 16 17:28:32 2003
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Date: Tue, 16 Dec 2003 23:26:57 +0100
From: Henrik Levkowetz <henrik@levkowetz.com>
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Subject: [Mip4] Runthrough of issues raised on draft-ietf-dhc-mipadvert-opt-01.txt
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--Signature=_Tue__16_Dec_2003_23_26_57_+0100_djqZ5C0Y8eScSeZC
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Hi,

    I've gone through the comments given on this draft as a result of
the WG last call.

The issues have been recorded in an issue tracker at 
 http://www.mip4.org/issues/tracker/mip4/ , and the proposed
resolution for each of the issues raised can be seen in the
working documents I maintain at 
 http://ietf.levkowetz.com/drafts/dhc/mipadvert/ , as well
as in the issue tracker.

I'd much appreciate feedback on the proposed resolutions. See the
list below for the individual issues, and link to proposed text.

The full text of the current incarnation of the working document, with
all the proposed fixes applied, is at:
 http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.n.txt

	Henrik

---

Issue	Details

28  	Title: How does the DHCP server know about agent load?
	From: Kuntal Chowdhury <kuntal@iqmail.net>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue28
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.a-from-01.diff.html

29 	Title: 'B' bit may not always be valid
	From: Kuntal Chowdhury <kuntal@iqmail.net>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue29
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.b-from-02.a.diff.html

30 	Title: Precise rules for sending and receiving these options needed.
	From: Ralph Droms <rdroms@cisco.com>,
	      Alpesh Patel <alpesh@cisco.com>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue30
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.c-from-02.b.diff.html

31 	Title: Handling of sequence number field
	From: Naveen Paulkandasamy <naveenpk@cisco.com>,
	      Thomas Narten <narten@us.ibm.com>
	      and others
	Issue: http://www.mip4.org/issues/tracker/mip4/issue31
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.d-from-02.c.diff.html

32 	Title: Zero-length suboptions
	From: Kim Kinnear <kkinnear@cisco.com>,
	      Bernie Volz <volz@metrocast.net>,
	      Ted Lemon <mellon@fugue.com>,
	      Eric.Luce@nominum.com
	Issue: http://www.mip4.org/issues/tracker/mip4/issue32
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.e-from-02.d.diff.html

33 	Title: Add request to IANA to maintain registry for sub-options
	From: Ralph Droms <rdroms@cisco.com>,
	      Alpesh Patel <alpesh@cisco.com>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue33
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.f-from-02.e.diff.html

34 	Title: AD comments, with bearing on issues 29, 30, 33, plus nits
	From: Thomas Narten <narten@us.ibm.com>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue34
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.g-from-02.f.diff.html

36 	Title: Duplication of 3344 advertisement format specification & 1 nit
	From: Sami Vaarala <sami.vaarala@iki.fi>,
	      Espen Klovning <espen@birdstep.com>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue36
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.h-from-02.g.diff.html

37 	Title: How should MN use this option? 
	From: Espen Klovning" <espen@birdstep.com>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue37
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.i-from-02.h.diff.html

38 	Title: Must the Agents be on-link?
	From: Pete McCann <mccap@lucent.com>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue38
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.j-from-02.i.diff.html

39 	Title: Nits
	From: Ralph Droms <rdroms@cisco.com>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue39
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.k-from-02.j.diff.html

40 	Title: How to select the individual agent assignments
	From: Alpesh Patel <alpesh@cisco.com>,
	      Naveen Paulkandasamy <naveenpk@cisco.com>,
	Issue: http://www.mip4.org/issues/tracker/mip4/issue40
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.l-from-02.k.diff.html

41 	Title: How does this option tie into authentication of DHCP messages
	From: Alpesh Patel <alpesh@cisco.com>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue41
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.m-from-02.l.diff.html

42 	Title: Tying NAI and ciaddr fields together
	From: Alpesh Patel <alpesh@cisco.com>
	Issue: http://www.mip4.org/issues/tracker/mip4/issue42
	Fix: http://ietf.levkowetz.com/drafts/dhc/mipadvert/draft-ietf-dhc-mipadvert-opt-02.n-from-02.m.diff.html




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Subject: [Mip4] ACM MobiCom 2004 - Preliminary CFP
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We apologize in advance if you receive multiple copies of this CFP.

----------------------------------------------------------------------

                            
                        PRELIMINARY ANNOUNCEMENT 
                          AND CALL FOR PAPERS
                                    
                              MobiCom 2004
               The Tenth Annual International Conference
                   on Mobile Computing and Networking
                  
                      September 26 - October 1, 2004
                          Philadelphia, PA, USA
             (dates and location are subject to final approval)

                 http://www.sigmobile.org/mobicom/2004/

                       Sponsored by ACM SIGMOBILE

                             IMPORTANT DATES:
                         Paper registrations due:
                              March 8, 2004
                          Paper submissions due:
                              March 15, 2004
                        Notification of acceptance:
                              June 21, 2004
                        Camera-ready versions due:
                              July 25, 2004
 
ACM MobiCom 2004, the Tenth Annual International Conference on Mobile
Computing and Networking, is the tenth in the series of annual
conferences sponsored by ACM SIGMOBILE and dedicated to addressing the
challenges in the areas of mobile computing and wireless and mobile
networking. The MobiCom conference series serves as the premier
international forum addressing networks, systems, algorithms, and
applications that support the symbiosis of mobile computers and wireless
networks. MobiCom is a highly selective, single-track conference
focusing on all issues in mobile computing and wireless and mobile
networking at the link layer and above.
 
 PAPERS: Authors are invited to submit full papers presenting new
research related to the theory or practice of mobile computing and
networking. All submissions must describe original research that is not
published or currently under review by another conference or journal.
Areas of interest include, but are not limited to:
- Applications and computing services supporting mobile users
- Architectures, protocols, and algorithms to cope with mobility,
limited
      bandwidth, or intermittent connectivity
- Database and data management issues in mobile computing
- Operating system and middleware support for mobile computing and

      networking
- Distributed systems aspects of mobile computing
- New mobile and wireless applications
- Integration and interworking of wired and wireless networks 
- Performance of mobile and wireless networks and systems 
- Location-dependent applications and protocols
- Security and privacy of mobile/wireless systems
- Mobile ad hoc and sensor networks
- Wireless multimedia systems
- Algorithms and protocols for power management and control
- Service creation and management environments for mobile/wireless
systems
 
The program committee will referee all papers, and accepted papers will
be published in the conference proceedings. Selected papers will appear
in a special issue of the ACM/Kluwer Wireless Networks (WINET) journal.
 
CHALLENGES PAPERS: The conference also solicits short papers (maximum of
8 pages) that challenge the mobile computing community with
revolutionary new approaches, new technologies, or visionary
applications. Such papers should provide stimulating ideas or grand
visions that may open up exciting avenues of far-reaching future
research. Descriptions of new products or simple evolution of existing
work are not appropriate as Challenges Papers. Challenges Papers will be
reviewed and should be submitted using the normal submission procedure.
The title of such papers must start with the word "Challenges," i.e.,
"Challenges: ... `rest of the title'."
 
SUBMISSION INSTRUCTIONS: All paper submissions will be handled
electronically. Authors should prepare a PDF or a PostScript version of
their full paper. Papers must be no longer than 15 pages (8 pages for
Challenges submissions), font size not smaller than 10 points, and must
fit properly on U.S. "letter"-sized paper (8.5x11 inches) with
reasonable margins. Detailed instructions for the paper submission
procedure and format will be available on the conference web pages. The
deadline for registering the title and the abstract of the paper with
our electronic submission system is March 8, 2004 and the deadline for
submitting the actual paper is March 15, 2004. All deadlines are 11:59PM
EST.

All submitted papers will be judged based on their quality through
double-blind review process, where the identities of the authors are
withheld from the reviewers. Authors should not be identifiable by any
means from the paper or from the PDF or the Postscript file. Guidelines
for preparing the paper for blind reviewing, as well as electronic paper
submission instructions, will be available on the conference web pages.

Submitted or substantially similar papers must not be currently under
review for any other publication. Please direct any questions regarding
paper submission to the Program Co-Chairs, Samir Das and Ravi Jain at
mobicom_pcchairs@acm.org.
 
TUTORIALS: Proposals for tutorials are solicited. Evaluation of tutorial
proposals will be based on the expertise and experience of the
instructors and on the relevance of the subject matter. Potential
instructors are requested to submit a tutorial proposal of at most 5
pages, including a biographical sketch, to the Tutorial Co-Chairs,
Andrew Campbell (campbell@ee.columbia.edu) and Taieb Znati
(tznati@nsf.gov). The deadline for tutorial proposals is April 05, 2004.
 
PANELS: Panel proposals are solicited that examine innovative,
controversial, or otherwise provocative issues of interest. Panel
proposals should not exceed 3 pages, including biographical sketches of
the panelists. Potential panel organizers should contact the Panel
Co-Chairs, Prathima Agrawal (pagrawal@eng.auburn.edu) and Tao Zhang
(tao@research.telcordia.com). The deadline for panel proposals is April
26, 2004.
 
RESEARCH DEMOS AND EXHIBITS: Proposals for research demos are solicited.
Proposals should not exceed 3 pages and should include a description of
the demo and equipment to be used. Send proposals to the Research Demo
Chair, Elizabeth Belding-Royer (ebelding@cs.ucsb.edu). The deadline for
demo proposals is July 12, 2004. We are also planning an Expo featuring
exhibits of the latest mobile computing products and services.

STUDENT POSTER SESSION: Student posters are solicited that present
recent and on-going research by students on mobile computing and mobile
and wireless networking topics. Student posters should not exceed 2
pages and should include a description of the student's research. See
above for paper formatting requirements. Accepted posters will be put on
the conference web page; however, they will not be printed in the
conference proceedings. Send poster submissions to the Student Poster
Co-Chairs, Chiara Petrioli (petrioli@di.uniroma1.it) and Stefano Basagni
(basagni@ece.neu.edu). The deadline for student posters is July 12,
2004.

BEST STUDENT PAPER AWARD: Papers with a student as a primary author will
be considered for the Best Student Paper Award, with a cash award of
1000 USD. Students must indicate with their submission that they would
like to be considered for this award. The student author of the awarded
paper is expected to present the paper at the conference.
 
 GENERAL CHAIR
               Zygmunt Haas
                     Cornell University
                      
 PROGRAM CO-CHAIRS
         Samir R. Das
                     Stony Brook University, SUNY
                      
                     Ravi Jain
                     DoCoMo USA Labs

 STEERING COMMITTEE CHAIR
   Imrich Chlamtac
   University of Texas at Dallas


 ACM PROGRAM DIRECTOR
                     Ginger Ignatoff


 Additional committee members will be announced on the conference web
page.


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Subject: [Mip4] MobiQuitous 2004 - Call for Papers
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We apologize if you receive multiple copies of this Call for Papers

***********************************************************************
             PRELIMINARY ANNOUNCEMENT and CALL FOR PAPERS

                         MobiQuitous 2004
                    http://www.mobiquitous.org

           The First Annual International Conference on
      Mobile and Ubiquitous Systems: Networking and Services

        August 22-25, 2004   Boston, Massachusetts, USA
 
                    (ACM sponsorship pending)

***********************************************************************

The combination of mobile and ubiquitous computing is emerging as a
promising new paradigm with the goal to provide computing and
communication services all the time, everywhere, transparently and
invisibly to the user, using devices embedded in the surrounding
physical environment. In this context, the communication devices, the
objects with which they interact, or both may be mobile. The
implementation of such a paradigm requires advances in wireless
network technologies and devices, development of infrastructures
supporting cognitive environments, and discovery and identification of
ubiquitous computing applications and services. The first ACM Annual
International Conference on Mobile and Ubiquitous Systems: networking
and services (Mobiquitous 04) will cover all these aspects,
representing a forum where practitioners and researchers coming from
the many areas involved in ubiquitous solutions design and deployment
will be able to interact exchanging the cross-layer experiences needed
to build the overall ubiquitous systems. Areas addressed by the
conference include: applications, service-oriented computing,
middleware, networking, agents, knowledge management and databases.

PAPERS: Technical papers describing original, previously unpublished
research, not currently under review by another conference or journal,
are solicited. The conference is interested in contributions
addressing all the areas associated with mobile and ubiquitous
architectures, infrastructure and services. Technical works clearly
identifying how the specific contributions fit to an overall working
solution are particularly of interest. Topics include, but are not
limited to, the following feature topics: 

* Ubiquitous architectures and systems 
* Wearable computing and personal area network 
* Wireless technologies for mobile and ubiquitous communications 
  (Bluetooth, ZigBee, 802.15.x, WiFi) 
* Wireless Internet access in ubiquitous systems 
* Reconfigurability and personalization of wireless network 
* Service discovery mechanisms, knowledge discovery, matching and 
  composition mechanisms 
* Wireless/mobile service management and delivery 
* Security, privacy and social issues of mobile and ubiquitous systems 
* Peer-to-peer knowledge management 
* Emerging industrial/business scenarios 
* Multimodal interfaces (speech, video kinetic, tactile) 
* Smart spaces 
* Ad hoc and sensor networking 
* Localization and tracking 
* Context and location aware application 
* Multimedia encoding and transcoding 
* Middleware services 
* Agent technologies in ubiquitous, wearable, and mobile systems 
* Hardware and software platforms for ubiquitous systems, and testbeds 
* User interfaces
* Toolkits, development environments, and languages for ubiquitous
  computing 
* Ontologies for mobile and ubiquitous computing

SUBMISSION INSTRUCTIONS: All paper submissions will be handled
electronically (see the conference web page for details). Authors
should prepare a Portable Document Format (PDF) or postscript version
of their full paper.  Papers must not exceed 8 pages double column (US
Letter size, 8.5 x 11 inches) including text, figures and
references. The font size must be at least 10 points.

PUBLICATION: All submitted papers will be rigorously reviewed by
technical program committee members. Accepted papers will be published
in the conference proceedings.  Papers of particular merit will be
proposed for publication in the ACM/Kluwer Wireless Networks journal.

TUTORIALS: Proposals for tutorials are solicited.  Evaluation of
tutorial proposals will be based on the expertise and experience of
the instructors, and on the relevance of the subject matter.
Potential instructors are requested to submit a tutorial proposal of
at most 5 pages, including a biographical sketch, to the Tutorial
Chair by March 1, 2004.

DEMOS: Proposals for research and industrial demos are solicited.  A
maximum of 3 pages should be submitted which include a description of
the demo and needed equipment. Proposals should be submitted to the
Demo Chair, which will be announced shortly.


***********************************************************************
                            IMPORTANT DATES
***********************************************************************
Paper submission due:         FEBRUARY 1 2004
Notification of acceptance:   APRIL 30 2004
Camera-ready version due:     MAY 15 2004
**********************************************************************

*** ORGANIZING COMMITTEE

* General Co-Chairs
  Imrich Chlamtac
  University of Texas at Dallas, U.S.A.
  chlamtac@utdallas.edu

  Fausto  Giunchiglia
  Universita` di Trento, Italy
  fausto@dit.unitn.it

* General Vice Co-Chairs
  Michele Zorzi 
  Universita` di Padova, Italy
  zorzi@dei.unipd.it

  Valentina Tamma 
  University of Liverpool, U.K.
  valli@csc.liv.ac.uk

* Program Co-Chairs
  * Networking
    Tom La Porta
    Penn State University, U.S.A.
    tlp@cse.psu.edu

    Chiara Petrioli
    Universita` di Roma "La Sapienza," Italy 
    petrioli@dsi.uniroma1.it

  * Knowledge management
    Tim Finin
    Univ. of Maryland Baltimore County, U.S.A.
    finin@cs.umbc.edu

    Chiara Ghidini 
    ITC-IRST, Trento, Italy 
    ghidini@itc.it

* Tutorial Chair
  Mani Srivastava
  Univ. of California Los Angeles, U.S.A.

* Publicity Co-Chairs
  Stefano Basagni 
  Northeastern University, U.S.A.

  Ilya Zaihrayeu
  Universita` di Trento, Italy

* Registration Chair
  Robin Kravets
  Univ. of Illinois Urbana-Champaign, U.S.A.

* Demo Chair
  Yannis Labrou
  Fujitsu Labs of America, U.S.A.

* Local Arrangements Chair
  Prithwish Basu
  BBN Technologies, U.S.A.

* Publication Chair
  Roger Whitaker
  Cardiff University, U.K.




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