Is ipv6 backward compatable with ipv4?

Yes and no... IPv6 does contain completely different addressing, so you'll have to recode your app to use the alternative headers and structure sizes.

Not without the assistance of an IPv4/IPv6 gateway in the network, and even then communication will be limited by the typical problems introduced by network address translating gateways. The traditional advice for programmers facing decisions like this is to recommend supporting both IPv4 and IPv6 at the same time.

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