Others Logging In?

[Skelo]

Heya I set up a Server the name is Smoked Somewhat Legit Server. Anyway When i had my router hooked up, when i went to whatismyip.com I got the same Ip on my server and my workstation. So when i make the server I can log into it Np, but others cant is this because the ip is the same on both computers? SO THEN, I hooked up my switch and went to whatismyip.com I got 2 different ip's SO i changed the nessessary files to point to my servers Ip, Been running Eqemu server for 2days now No problem I got ppl logging in and everything.. I dont have a Cisco router so I dont know what Nat is.. Im using speedstream router.. I need to get it pluged back up so i can use my other workstation and my laptop.. what can i do to split up the Ip's??

Thanks