In message <[email protected]>, Curtis Villamizar writes: > > In message <[email protected]> > Mikael Abrahamsson writes: > > > On Wed, 1 Aug 2012, Brian E Carpenter wrote: > > > > > That's true. My point was that the CPE resolver will have to be upgraded > > > to support DNS64 for, and *only* for, IPv6-only hosts. How it knows > > > which hosts are IPv6-only is another mystery. > > > > Indeed, I started a thread about this on v6ops the other day: > > > > <http://www.ietf.org/mail-archive/web/v6ops/current/msg13581.html> > > > > Seems there is no solution to this problem and I'm seem to be having > > trouble getting traction there that this might actually be a real problem > > that needs solving. > > > Same answer as one given on that thread. If a device can support > IPv4, then use NAT4. If a device can only support IPv6, then the > DNS64 belongs on the IPv6-only device. To that device all host return > AAAA records, since the A records are translated into ipv4-in-ipv6 > space. The CPE should be dual stack and be capable of both NAT4 and > NAT64 translations to allow reachability into the IPv4 world. This is > simple. As pointed out on the thread, a patch has already been > submitted to android and some 3gpp phone already do DNS64. > > If the CPE doesn't do NAT64, the packet will wander along some route, > most likely the default route, until it either hits a NAT64 or runs > into a black hole. > > Propogating DNS64 translated address can cause severe problems and > therefore should never leak outside the single IPv6 only host that > needs it to get to IPv4 addresses. DNS64 and NAT64 already exist for > BSD and Linux (bind and pf for BSD, bind and linuxnat64 for linux).
DNS64 does not add synthesised addresses to existing AAAA RRsets. IPv6-only nodes will not be able to connect to dual stack servers as there is no IPv6 path. > Curtis > _______________________________________________ > homenet mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/homenet -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: [email protected] _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
