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The protocol is called MAP and it is nearly stateless, cause the IPv4 address is in the IPv6 packet, and more efficient than carrier-grade NAT. The downside is
by ianburrell 3y ago
The protocol is called MAP and it is nearly stateless, cause the IPv4 address is in the IPv6 packet, and more efficient than carrier-grade NAT. The downside is that requires special gateway on customer side. The advantage is that ISP can have IPv6 internal network with IPv4 on the edges.
- GolDDranks 3y agoOh, I was talking about NAT64/DNS64 which is what NTT Docomo is doing. Now I got to read about MAP... But how can the mapping be almost stateless? When packets are sent from IPv6 to IPv4, if there is significant exhaustion, multiple IPv6 address are going to map into a single IPv4 address, unless the ISP has enough for everybody, in which case I don't see the motivation to hasten moving to IPv6? Edit: Ah, uses port numbers as extra bytes to encode the original senders address information. Smart!