A mud I worked on had it done, and the guy explained to me how to do it, and I think it was just a linux command.

My mud is running on port 6000 on one server, but my site is hosted elsewhere.

I want when people connect to my website, port 6000, for it to go to my mud.

I know it can be done, I just can't remember how.

I have shell access on both server.

Can someone help me?

I was positive it was just a simple linux command but after searching for hours I cannot find it.

There are a couple of ways to do that. You could use "stunnel". I'd probably put an entry in the host machine's firewall to redirect incoming connections to the target machine, but the requires you have root access and know a little iptables. You can probably also find a forking port-forwarding program. I know I have an old non-forking one sitting around, but you'd want to support more than one connection at a time. :)

SSH tunneling is probably your best bet in terms of ease of use, availability etc., but really all you need is any old tunneling program. I don't think you should worry about messing with iptables.