On Nov 24, 2009, at 08:33, Durand, Alain wrote: > > This is only require if you do not have a unique IPv4 address per node.
I think you meant to say "a unique IPv4 address *realm* per node" there. > What I'm suggesting is to allocate/derive a unique v4 address to each node. A more flexible approach would be to derive a unique IPv4 private subnet for each DS-lite node in a given private address realm with a bijective mapping to its IPv6 address. > It can be done either by running DHCPv4 over the DS-lite tunnel, or defining > an IPv4 allocation option for DHCPv6 or defining a mechanism to > automatically derive a unique v4 address from the DHCPv6 assigned v6 > address. I don't see a good reason to muck with DHCPv6 here. I'd suggest using DHCPv4 over the DS-lite tunnel. That way a DS-lite gateway could use a DHCPv4 relay and serve addresses to its local IPv4 links. The bijective mapping between IPv4 subnets and IPv6 addresses would permit DS-lite hosts and gateways to tunnel directly over IPv6 without passing through the service-provider NAT44 gateway. Of course, DS-lite hosts and gateways could also use IPv4 stateful filtering for local host and network protection. That's an orthogonal problem. -- james woodyatt <[email protected]> member of technical staff, communications engineering _______________________________________________ Softwires mailing list [email protected] https://www.ietf.org/mailman/listinfo/softwires
