Reicast Libretro has now gained modem and PPP support. It leverages dreamcastlive.net which makes it possible to still play these games while their original servers are down. Grab the latest core from the buildbot in order to use this! It should work on Windows, Linux, Android, and potentially even macOS seamlessly without having to input an IP address, thanks to true zero-configuration multiplayer! To our knowledge, this is the first time a Dreamcast emulator offers true zero-configuration multiplayer support like this. Demul requires a complicated TAP driver/OpenVPN configuration, and modem support was not implemented yet since the last time we checked.
Source: https://www.libretro.com/index.php/reic ... time-ever/