It was only a few months ago EA brought a cease-and-desist flavoured end to the unofficial support of various older Battlefield games. Fortunately for Battlefield 2142 fans, some enterprising individuals are running multiplayer servers right now for the sci-fi themed shooter.
If you're keen to get involved, your best bet is to visit the "Battlefield 1942 -- Reclamation" website, which includes instructions on how to get started.
There's nothing very complicated involved, though you will need to download a program called GameRanger. This will let you find and connect to the servers. Two are available: one in the US and the other Europe. So not great for Aussie players, but you could always join the Discord server and ask nicely.
Now, it's very possible this effort will be shut down eventually, but for now, if you have a hankering for Battlefield 2142, here's your chance to scratch that itch.