Hi, ----- Original Message ----- > From: Arifumi Matsumoto <arif...@nttv6.net> > To: François-Xavier Le Bail <fx.leb...@yahoo.com> > Cc: Thomas Narten <nar...@us.ibm.com>; ipv6@ietf.org > Sent: Tuesday, October 11, 2011 5:02 AM > Subject: Re: Question about Subnet-Router anycast address > > On 2011/10/03, at 23:08, François-Xavier Le Bail wrote: > >> --- On Mon, 10/3/11, Thomas Narten <nar...@us.ibm.com> wrote: >>> <fx.leb...@yahoo.com> writes: >>> The norm is (and has been forever) to require that the >>> source address in a response (whether TCP or UDP) match the destination >>> address in the original query. And for good reason. >> >> But the RFC 3484, as I understand it, exclude anycast address from the >> source replies. >> >> Section 4 of RFC 3484 states: >> (http://tools.ietf.org/html/rfc3484#section-4) >> 4. Candidate Source Addresses >> [. . .] >> In any case, anycast addresses, multicast addresses, and the >> unspecified address MUST NOT be included in a candidate set. >> >> It might be useful to reassess this restriction, at least for the replies. > > As in RFC 3484 section 2, these algorithms in RFC 3484 does > not specify the rules for your case. It specifies the rules > that are used when an application initiates a session and > a destination address and a source address have to be chosen. > It does not specify rules for selecting address for a returning > packet.
> > So, in my understanding, the only restriction for using an > anycast source address was in RFC 3513. But, now that such a > restriction was removed, RFC 3484 should also be updated to > allow to select an anycast source address for a initiating > session. > Arifumi Matsumoto Perhaps it is not clear enough in RFC 3484 if the algorithm for source address selection is involved or not for replies to IPv6 packets of unconnected protocols (UDP, ICMP echo request, etc.). If agreed, draft-ietf-6man-rfc3484-revise should add a clear status on this question. Thanks, François-Xavier -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
