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Let's say I have two networks setup like so:

| Host A - IPv6 | ------ [Internet] ------ | Network B - IPv4 |

I want to vpn from Host A to Network B but translate the IPv4 packets to a seperate IPv6 subnet:

| Network B (VPN Server) | --> [ Host A (VPN Client) --> (IPv4 to IPv6 translator) --> (Routable interface) ]

The idea is to have remote IPv4 vpns that conflict with Host A's networks (or eachother) map to a single cohesive IPv6 network (and possibly load connections into a dns server for sanity).

I'm doing pretty much all of this with OpenVPN and iptables on linux. Any suggestions on where to start?

  • This is called NAT64. Many software packages are already available that implement it. See also DNS64. – Michael Hampton Dec 19 '18 at 21:01

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