[tor-relays] IPv6 to IPv4 tor exit relays would fix many daily tor-problems

[Fof582]

> Most tor clients send a DNS name, and flags that say whether they
> allow IPv4 and IPv6, and which one they prefer. They rely on the Exit
> to resolve the IP address and connect to the site.
> On the current network, an IPv6-only Exit won"t get the Exit flag, and
> therefore won"t get much client traffic. And it probably shouldn"t,
> until almost all internet sites are on IPv6. Otherwise clients will
> ask it to connect to IPv4-only sites, and it will fail them.

But thats exactly the case in a "tor exit that can only be reached by ipv6, but reach itself ipv4 and ipv6".
Can such a exit be run at the moment? IPv6 can be used on such a exit for in+out-traffic, IPv4 can be used to reach out everything - its just behind a NAT.
IPv4-only sites can be reached from the exit. The only case is that the exit itself can only be reached over IPv6 because of IPv4-NAT.
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