"Hemant Singh (shemant)" <shem...@cisco.com> writes:
> -----Original Message-----
> From: Thomas Narten [mailto:nar...@us.ibm.com]
> Sent: Wednesday, May 06, 2009 2:58 PM
> To: Hemant Singh (shemant)
> Cc: JINMEI Tatuya / ç¥æéå; Wes Beebee (wbeebee);
> erik.nordm...@sun.com; ipv6@ietf.org
> Subject: Re: comments on draft-ietf-6man-ipv6-subnet-model-03
> >> "WB> Routers decrement the Hop Limit field. Therefore, there is a
> >> Hop Limit (255) that exists that can be used to indicate that
> >> packet has not crossed a router. Note, however, that ND Proxy
> >> explicitly keeps the Hop Limit the same, so this definition
> >> (especially in the presence of networks that use ND Proxy) yields
> >> a different notion of on-link than RFC 4861 and a different notion
> >> of on-link than reception of link-scoped packets.
> >Can you point to an RFC that supports the above? I didn't know proxies
> >take liberties with the TTL field. And if they do, I suspect things
> >will not work properly.
> See the ND Proxy RFC of RFC 4389 and section 4.1. Also, an IPv6
> router is one IPv6 node that is expected to support ND Proxy. I
> don't disagree with anything in the ND Proxy RFC. So why should we
> not keep this bullet in our document?
OK. I thought you were using a different notion of proxy (i.e., as is
used by MIPv6, where the P bit is not used).
Getting back to the original issue raised w.r.t. this point:
draft-ietf-6man-ipv6-subnet-model-03.txt currently says:
7. Note that the receipt of a packet with the Hop Limit field
unchanged (the Hop Limit could be specified in a packet-type
specific document) which is not an ND packet indicates direct
reachability on a link, but is not specifically treated by
[RFC4861].
I do not see what value this text adds to the document and think it
would be simplest to just remove it. Even now understanding what you
meant by "proxy" in your followup response above, my opinion remains
that the text in the document is not necessary or helpful.
Thanks,
Thomas
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