I have friends. We have LFS. We want to play together. We don't like having to use servers that we can't run ourselves.

How can we play online together? I have used Hamachi for games like Counter-Strike, but I've read that LFS is not compatible with it. How could we play with each other?

set up a server with a password?

Quote from bunder9999 :

set up a server with a password?

I do believe we're all on routers, which I believe would make hosting a frustrating process.

Quote from Cr!t!calDrift :

I do believe we're all on routers, which I believe would make hosting a frustrating process.

Only the person hosting has to configure their router for access. Take a look here for a lot more information about hosting.