On Aug 12, 2010, at 3:55 PM, Brian E Carpenter wrote: > Isn't this a case where what we really want is MUST implement and SHOULD > enable? > > If I bought a router, I would expect it to be capable of redirecting but > I might want to disable it.
Makes sense to me. Bob > > Regards > Brian > > On 2010-08-13 07:47, Alain Durand wrote: >> I have a question about draft-ietf-6man-node-req-bis-05.txt. >> Section 5.2: >> >> Redirect functionality SHOULD be supported. If the node is a router, >> Redirect functionality MUST be supported. >> >> However, draft-ietf-6man-node-req-bis-05.txt refer to the normative text on >> Neighbor Discovery, ie RFC4861 that says: >> Section 8.2: >> >> >> A router SHOULD send a redirect message, subject to rate limiting, >> whenever it forwards a packet that is not explicitly addressed to >> itself (i.e., a packet that is not source routed through the router) >> in which: >> >> - the Source Address field of the packet identifies a neighbor, >> and >> >> - the router determines (by means outside the scope of this >> specification) that a better first-hop node resides on the same >> link as the sending node for the Destination Address of the >> packet being forwarded, and >> >> - the Destination Address of the packet is not a multicast >> address. >> >> >> It seems that the Node requirement text is going above and beyond what is >> required by RFC4861, transforming the SHOULD into a MUST. >> I might have missed (or do not remember) the discussion, is there a reason >> for this change? And shouldn't the ND spec have been changed first >> to allow to upgrade the SHOULD into A MUST? >> >> For the record, I support the SHOULD in RFC4861 and I would rather like to >> see the node requirements document say the same thing. >> >> - Alain. >> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> [email protected] >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- >> > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > [email protected] > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
