All Time: Xbox Series X and S are LAN-playable from the very first Xbox
YouTube enthusiasts from the Modern Vintage Gamer have found that the Xbox System Link still works for multiplayer games across all Xbox consoles, from the very first Xbox to the current Xbox Series X and Series S. This means you can unite consoles of all four generations: Xbox, Xbox 360, Xbox One and the new Series X and Series S.
You can connect consoles to one local network, for example, to play Halo: Combat Evolved. This feature is called Xbox System Link . It was used most often on Xbox and Xbox 360, but some gamers still enjoy getting together in the same room and throwing LAN parties like the good old days. The feature worked on Xbox One, and as it turns out, Xbox Series X and S support it too.
A video has been published on the Modern Vintage Gamer channel, in which the Xbox, Xbox 360, Xbox One and Xbox Series S connected to the same local network allow you to play Crimson Skies together. This project is for the original Xbox and is available for backward compatibility on all subsequent consoles.