Some old Amiga ECS games can be run across the internet (or lan) using Kaillera.
I've played Speedball 2 on the net in WinUAE
I downloaded a package from somewhere that had everything set up, tcp setings, adfs, WinUAE config etc.
Search the forums at
www.amigagames.com for more info about adfs/winUAE/kaillera and getting them all to work.