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- Transition technique designed to allow native IPv6 hosts to access IPv4-only content.
- (Translation technique not a tunneling technique).
- Primarily used to allow v6 hosts to initiate connections to IPv4 content.
- Mechanisms do exist to allow the reverse.
- Stateful and stateless versions.
- stateful can use any prefix
- stateless has restriction on prefix
NAT64 and DNS64 co-existance.
- IPv6 host sends AAAA DNS Query
- DNS64 server tries AAAA lookup and fails
- DNS64 server successfully resolves IPv4 address
- DNS64 server generates AAAA DNS response of <IPv6 prefix:IPv4 adress> and sends it back to the client.
- A specific IPv6 prefix must be allocated to represent addresses that will be translated by NAT64
- There are two names:
- Well-known prefix: 64::ff9b::/96 (not routable)
- Network Specific prefix ( NSP ) derived from global IPv6 Prefix