Mingwei Xu wrote: > In host mode, an IPv6 host wants to communicate with a dual stack > host in an IPv4 network. Yes, you are right. In this scenario, > there need not translation, some tunnel mechanism can meet the > requirement. However, in tunnel mechanisms, tunnel end point, e.g. > a gateway between IPv4 and IPv6 networks, has to maintain a big > tunnel mapping table if there are many dual stack hosts.
That's not true in general. ISATAP and 6to4 are two examples of tunneling protocols where the endpoints are stateless. If you put a NAT64 on the same box as an ISATAP router, the tunneling portion is still stateless and the NAT64 is of course stateful but it is oblivious to the fact that there's any tunneling. > While, > in IVIT, since IPv4 addresses are embeded in IPv6 addresses, the > gateway can obtain the IPv4 addresses from IPv6 addresses without > looking up the tunnel mapping table. I still don't follow what scenario we're talking about. If the host is IPv6-only it can't do tunneling. If it can do tunneling then it's IPv4-capable and you can just use IPv4, right? -Dave _______________________________________________ Softwires mailing list [email protected] https://www.ietf.org/mailman/listinfo/softwires
