RE: I-D ACTION:draft-soliman-ipv6-2461-bis-00.txt

["Barany, Pete" <pbarany@qualcomm.com>]

I raised an issue awhile back regarding the Router Lifetime field and
the AdvDefaultLifetime parameter and the wording of Section 4.2 in RFC
2461. I insert the e-mail below from Erik Nordmark discussing this.
Would it be possible to consider changing the wording in Section 4.2 per
the e-mail below? Thanks.

Regards,

Pete

--> INSERT e-mail

> What I mean to say is that the parameter AdvDefaultLifetime MUST be 
> either zero or between MaxRtrAdvInterval and 9000 seconds (IPv6) per 
> RFC 2461. Same thing for IPv4 per RFC 1256 (only the parameter is 
> Advertisement Lifetime). The inconsistency (for lack of a better word)

> is that the Router Lifetime field is 16 bits and if set to anything 
> greater than 9000 seconds then this would violate the specifications. 
> So, if it is set to 18.2 hours (e.g., for some wireless cellular 
> links) it violates the specs.

Thanks, now I understand your point.

While the wording might be unfortunate and perhaps confusing, saying
that 2^^16 seconds is 18.2 hours is correct. Even though the sender will
not use more than 9000 seconds the protocol doesn't, and presumably
shouldn't, have the receivers reject RAs with a router lifetime that is
larger per the "consevative in what you send; 
liberal in what you accept" principle.

So if we change the sentence in 4.2 from:
	The maximum value corresponds to 18.2 hours.
to
	The field can contain values up to 65535 and receivers should
	handle any value, while the sending rules in section 6 limit
	the lifetime to 9000 seconds.
would that be better?

  Erik

--> END INSERT e-mail

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

-----Original Message-----
From: ipv6-admin@ietf.org [mailto:ipv6-admin@ietf.org] On Behalf Of
Internet-Drafts@ietf.org
Sent: Wednesday, October 22, 2003 3:56 PM
Cc: ipv6@ietf.org
Subject: I-D ACTION:draft-soliman-ipv6-2461-bis-00.txt

A New Internet-Draft is available from the on-line Internet-Drafts
directories.


	Title		: Neighbor Discovery for IP version 6 (IPv6)
	Author(s)	: T. Narten, et. al.
	Filename	: draft-soliman-ipv6-2461-bis-00.txt
	Pages		: 86
	Date		: 2003-10-22
	
This document specifies the Neighbor Discovery protocol for IP
Version 6.  IPv6 nodes on the same link use Neighbor Discovery to
discover each other's presence, to determine each other's link-layer
addresses, to find routers and to maintain reachability information
about the paths to active neighbors.

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