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Re: NIST IPv6 document


From: Jima <nanog () jima tk>
Date: Thu, 06 Jan 2011 23:48:11 -0600

 Hey Lamar, long time no talk.

On 1/6/2011 10:16 AM, Lamar Owen wrote:
Standards are written by people, of course, and most paragraphs have reasons to be there; I would find it interesting to hear the 
rationale for a router filling a slot in its neighbor table for a host that doesn't exist.  For that matter, I'd like 
to see a pointer to which standard that says this so I can read the verbiage myself, as that may have enough explanation to 
satisfy my curiosity.

This actually came up last week in freenode/#ipv6; someone was puzzled why there were FAIL entries showing up in their neighbor table, so I dug into the RFC I found for ND (2461). Turns out, it specifically says entries for failed solicitations SHOULD be deleted.

http://tools.ietf.org/html/rfc2461#section-7.3.3

It's the seventh paragraph into that section, including the indented Note. ("Upon entering the PROBE state...")
 Pardon me if that's the wrong RFC.

     Jima


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