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System Link: game ports 1000/1001 on host ports 32000/32001 - #52
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OddTrie
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Oct 26, 2026
OddTrie
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- On Linux and macOS (and so under Proton/Wine, where bind() goes to the host) ports below 1024 are privileged: the game's System Link sockets could not bind 1000 and 1001 without root, so LAN and online play failed there.
- Every guest port 1..1023 now lives on the host at +31000 (1000 -> 32000, 1001 -> 32001): bind and connect use it, sends go to it, and received packets, getsockname and EOS deliveries are translated back, so the game itself still sees 1000/1001.
- Every copy of the game does the same on every OS, so Windows and Linux players find each other. Players on an older version can't see players on this one (and the reverse): everyone needs to update.
- The online pack has to be rebuilt from this patch.
- On Linux and macOS (and so under Proton/Wine, where bind() goes to the host) ports below 1024 are privileged: the game's System Link sockets could not bind 1000 and 1001 without root, so LAN and online play failed there. - Every guest port 1..1023 now lives on the host at +31000 (1000 -> 32000, 1001 -> 32001): bind and connect use it, sends go to it, and received packets, getsockname and EOS deliveries are translated back, so the game itself still sees 1000/1001. - Every copy of the game does the same on every OS, so Windows and Linux players find each other. Players on an older version can't see players on this one (and the reverse): everyone needs to update. - The online pack has to be rebuilt from this patch. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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