Thanks for replies,
I did exactly what kiwi said, and still, i can only connect to my own server from the same computer i am hosting the server on by typing:
./tremulous.x86 +connect 127.0.1.1:30720
And then i tried my brother from across the country to find it in the server list, and he couldn't find it either. I went on whatismyip.com, and found my ip address (75.175.59.247), and i found the default port (30720), and i told my brother to pull down the console and type:
connect 75.175.59.247:30720
And he still couldn't connect to it. Am i forgetting something? Thanks!