why don't you try it instead of creating that post ?

I created this post and forgot to mention that am looking for people to try it with. To try this query requires another person over the internet.

Or you could network with yourself....

I own 1 PC. Even if I did have a LAN I definitely know these old DOS games will work coz they use IPX and IPX works on LAN only. I am only interested in getting these old DOS games that use IPX LAN communications to work over internet. Hence why I need someone to help me test out GIT.

You can network DosBox on 1 PC without a network using localhost. If they work over localhost then the only difference you'll see between localhost and internet is routing and latency issues.

Does this emulate a fake IPX protocol, or does it really let users play DOSBox games network over the internet?

Dosbox produces UDP packets and that's why games can be played on the Internet as well as on LAN without additional software (well you may want some program to chat with your opponent). Servers behind a router need packets forwarded on a specific port.

To try this query requires another person over the internet.

You can start multiple Dosbox instances on one computer and use 'localhost' as the internet address.