Return-Path: X-Sieve: cmu-sieve 2.0 Return-Path: Received: (from majordom@localhost) by ece.cmu.edu (8.11.0/8.10.2) id h334oq524029 for ips-outgoing; Wed, 2 Apr 2003 23:50:52 -0500 (EST) X-Authentication-Warning: ece.cmu.edu: majordom set sender to owner-ips@ece.cmu.edu using -f Received: from ariel.nishansystems.com (ultrex.nishansystems.com [12.36.127.195]) by ece.cmu.edu (8.11.0/8.10.2) with ESMTP id h334oo324025 for ; Wed, 2 Apr 2003 23:50:50 -0500 (EST) Received: by ariel.nishansystems.com with Internet Mail Service (5.5.2653.19) id <21FNR04X>; Wed, 2 Apr 2003 20:50:34 -0800 Message-ID: From: Joshua Tseng To: "'Siva Vaddepuri'" , Kevin Gibbons , Joshua Tseng , "'ips@ece.cmu.edu'" Cc: "'Black_David@emc.com'" Subject: RE: Clarification regarding iSNS Message Format Date: Wed, 2 Apr 2003 20:50:32 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain Sender: owner-ips@ece.cmu.edu Precedence: bulk Siva, The authentication block is a MUST for Broadcast/Multicast messages (see section 7.2) and a SHOULD NOT (see section 5.5) for unicast messages. Originally there was a flag to indicate the presence of the authentication block in the iSNS flags. Somehow it disappeared in revision -05 (that was in November 2001 and I don't have any record of why it was removed, but my guess is that it was an accident). It needs to be put back in. We should probably make bit 18, which would indicate "authentication block present". Thanks for this catch. Josh -----Original Message----- From: Siva Vaddepuri [mailto:Siva.Vaddepuri@MCDATA.com] Sent: Wednesday, April 02, 2003 1:50 PM To: 'Kevin Gibbons'; Joshua Tseng; 'ips@ece.cmu.edu' Subject: Clarification regarding iSNS Message Format Hi, Can anybody clarifiy requirements for Authentication Block in iSNS Message? - Is it a MUST for Broadcast/Multicast packets? - Is it MUST-NOT for Unicast packets? If Authentication block is optional for unicast packets how do we determine iSNS Packet boundaries in TCP Session? iSNS Message Byte MSb LSb Offset 0 15 16 31 +---------------------+----------------------+ 0 | iSNSP VERSION | FUNCTION ID | 4 Bytes +---------------------+----------------------+ 4 | PDU LENGTH | FLAGS | 4 Bytes +---------------------+----------------------+ 8 | TRANSACTION ID | SEQUENCE ID | 4 Bytes +---------------------+----------------------+ 12 | | | PDU PAYLOAD | N Bytes | ... | +--------------------------------------------+ 12+N | AUTHENTICATION BLOCK (Multicast/Broadcast) | L Bytes +--------------------------------------------+ Total Length = 12 + N + L Thanks, Siva SPECIAL NOTICE All information transmitted hereby is intended only for the use of the addressee(s) named above and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution of confidential and privileged information is prohibited. If the reader of this message is not the intended recipient(s) or the employee or agent responsible for delivering the message to the intended recipient(s). You may not distribute or copy the confidential and privileged portion of this communication to another. Anyone who receives confidential and privileged information in error should notify us immediately by telephone and mail the original message to us at the above address and destroy all copies. To the extent any portion of this communication contains public information, no such restrictions apply to that information. (gate02)