This patch is for Transmission 3.00, and adds support for IPv6 NAT.
I write this patch because I use Transmission in docker with bridge, which will get a NAT IPv6 from the interface. In such a situation, Transmission will refuse to work with IPv6, including not sending IPv6 to the tracker, and disabling IPv6 extension in DHT.
Network:
PUBLIC_ADDR:PUBLIC_PORT -> DOCKER_ULA:LOCAL_PORT
This solution is very violent as the title says, we need a machine with a static IPv6 address running an IP-echo server, others can connect to it and get their public IP.
You need to change 2001::1234 and 12345 in ipv6-nat.patch to your server's IP and port.
And this patch force transmission to use the public address instead of the interface address, and bind to "::".
We also require PUBLIC_PORT == LOCAL_PORT, so that we will announce the correct ip:port to the tracker.