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...services behind the proxy ?* DNS proxy ?* Protection against replays ?* Zero (or even negative!) RTT overhead compared to connecting to the server directly, assuming the proxy is on path There's also an implementation available on Github: ?* Message library: https://github.com/45G/libsocks6msg ?* Utility library: https://github.com/45G/libsocks6util ?* TCP proxy and transparent proxifier: https://github.com/45G/sixtysocks The libraries are written in C++, but also have C bindings, so they could be used for a potential OpenSSH + SOCKSv6 prototype. Cheers, Vlad