Le 23 mars 2011 à 08:21, Ole Troan a écrit : > Remi, > >>>> It seems that a real world problem case is not covered by this >>>> update: tunneling v6 over v4 when there is a legacy CPE NAT in the way, >>>> in an ISP-managed way (unlike Teredo). At the moment this is a well >>>> known but orphaned problem, which will remain with us until the last >>>> NAT44-only consumer CPE device has gone. >>>> >>>> It's certainly the case that this scenario doesn't quite match >>>> RFC 4925 and doesn't need to "support all combinations of IP versions >>>> over one other." However, that is just a matter of charter wordsmithing. >>>> >>>> Nit: there's a reference to NAT-PT; maybe it should be NAT64 these days. >>> >>> that was the problem one set out to solve with RFC5571 (L2TP). >>> what's missing from that solution? >> >> Nothing that I know for its solution space, but this solution space is only >> stateful and hub-an-spoke. >> In particular, two host in the same customer site communicate in IPv6 via >> the L2TP Network server, which is an important functional limitation. >> >> As you know, as co-author of RFC 5969 on 6rd, a complementary and useful >> solution space is that of stateless solutions. >> In this pace, we all know that 6rd isn't sufficient to rapidly deploy IPv6 >> where there are legacy CPE's. >> A solution for this complementary scenario is therefore desirable. >> As it happens to be also possible, as shown in the 6a44 proposal, a work >> item on it has to be identified. >> >> Softwire, where 6rd has been in scope, seems the logical place to finalize >> this complementary solution. >> (It is also the logical place to finalize the 4rd solution, but this wasn't >> your question and is a different discussion) > > ah, OK I see. > stateless, managed, tunnels to a host behind a non IPv6 capable CPE. I missed > the Teredo reference in Brian's mail. > > I don't quite understand how these types of tunnels can be provisioned in a > "managed" way though??
It's plug and play in hosts (6a44 relays are the only ones to need management). - Hosts obtain the necessary parameters by means of a bubble dialogue with 6a44 relays. - 6a44 relays are reached at a well-known address and port couple. We can discuss this in more details in Prague. Cheers, RD > > cheers, > Ole _______________________________________________ Softwires mailing list [email protected] https://www.ietf.org/mailman/listinfo/softwires
