Has anyone had any experience, thoughts, etc. to share regarding DOSBox IPX networking over the internet and not just over local LAN?

I've done local LAN games a million times and they always work perfectly. Today I tried to do a game over the internet with my sister (we live in different states now 😐 ) with a UDP port on her router, and it couldn't connect. I tried pinging her router's IP address and that didn't work, so I'm thinking that's the problem. I'll fix it eventually.

Funny thing though, I tried a different game (not on DOSBox) over the same port and everything, and it worked perfectly.

I wasn't specifically asking for help with that problem, I was just wondering if anyone had some tips and tricks for this sort of thing.