> -----Original Message----- > From: Erik Nordmark [mailto:[EMAIL PROTECTED] > Sent: Thursday, February 17, 2005 6:26 PM > To: Margaret Wasserman > Cc: Dave Thaler; ipv6@ietf.org > Subject: Re: [NDProxy#16] Loop prevention, revisited > > Margaret Wasserman wrote: > > > My understanding of the current ND Proxy work (and why I grudgingly > > agreed to leave it on the most recent IPv6 charter despite the fact that > > we had not managed to reach consensus on this proposal for several > > years) was that we were planning to trim down the original ND Proxy > > proposal to a one-hop prefix delegation mechanism (perhaps with a flag > > to indicate whether the prefix has already been delegated, in which case > > it mustn't be delegated again) to provide a non-DHCP alternative for > > one-hop prefix delegation. I've never been quite sure why a non-DHCP > > mechanism is needed, but I'm also not religiously against the idea of > > standardizing an alternative. > > I think this should be explored further. > > It might not be that hard to come up with something which is is limited > to a single hop. > Here is a straw-man: > - add something to the RA which indicates that the sender is a proxy. > Could be just a single 'P' bit I think. > - a proxy can take an RA which arrives without the P bit, and send it > out as a RA with the P-bit. > - a proxy must not redistribute an RA with the P-bit set; if it > receives any (or only?) RAs with the P-bit set, that interface can not > be an upstream interface from a proxy perspective. > > I haven't worked through the cases to see if this will avoid all loops; > perhaps there can be (at least multicast) packet duplication if two such > proxies are connected in parallel. > > Erik
I agree this may be interesting, but it would be good to start a new thread, since it is for a very different scenario than a proxy, which has the constraint that it must be completely transparent to the router. Hence, this is not in any way competing with the ND Proxy draft, but it is a competitor to Prefix Delegation. -Dave -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
