Also, looking at draft-ietf-6man-flow-3697bis-07, i can see the
following under introduction:A stateful scenario is one where a node that processes the flow label value needs to store information about the flow, including the flow label value.... The flow label can be used most simply in stateless scenarios. This specification concentrates on the stateless model and how it can be used as a default mechanism. Details of stateful models, signaling, specific flow state establishment methods and their related service models are out of scope for this specification. Does this mean that the usage of flow label on ND/DAD is out of scope of 3697bis? -- Tassos Hemant Singh (shemant) wrote on 15/10/2011 03:24: Brian, Thanks for the reference. BTW, I was relatively sold on using the Flow Label to stick a nonce into for ND traffic because ND traffic remains in the link-local domain and is control traffic. It's not like a nonce labeled Flow Label data packet is leaking out to the wide area network. Also with the Flow Label there is less confusion vs. when we use the Nonce Option defined from SEND. In a mixed SEND and unsecured (no SEND) network, the lengths of the nonces MUST be the same. Otherwise some sloppy implementation can cause a buffer overrun parsing the nonce. It was the 20-bits in the Flow Label that was one big reason to ditch using it and then other was what my colleague said about overloading the Flow Label. Regards, Hemant -----Original Message----- From: Tassos Chatzithomaoglou [mailto:ach...@forthnetgroup.gr] Sent: Friday, October 14, 2011 8:17 PM To: Brian E Carpenter Cc: Hemant Singh (shemant); IPv6 WG Mailing List Subject: Re: FW: New Version Notification for draft-hsingh-6man-enhanced-dad-01.txt I have no objection Brian. I can understand the reason for keeping the flow label "clean". I was just wondering if there were any plans to use the flow label for ND traffic too, or we should consider that there are no real flows there. Regards, Tassos |
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