if you are running windows XP Pro, you can setup a VPN server on your EQ server computer and let 1 outside "LAN" into your LAN via IPTunneling. this will allow them to get an IP address based on your LAN as well as access anything you share out on your private network. Thru this you can connect as many outside computers as your subnet and IP scheme allows as long as all those using the VPN tunnel are all on the same LAN at the remote location.
Another intersting concept, but it causes increasing delay per hop, is taking the above idea and "daisy chaining" VPNs to connect as many networks as you like. The reason you have to daisy chain is because XP Pro only allows 1 VPN server connection per computer. I have used this method for 3 connections allowing my friends to play call of duty4 on my "lan" while sitting in thier homes. at 2 hops for for the last "lan", he had around a 150 ping.
To draw a diagram of it:
LAN1
-Comp1(EQ server and VPN server) --|
...............................................Rou ter-------------internet cloud
-Comp2-----------------------------|
LAN2
-Comp1(VPN server and VPN client into LAN1)--|
.................................................. ..........Router---internet cloud
-Comp2--------------------------------------|
LAN3
-Comp1(VPN client into LAN2)--------|
...............................................Rou ter------------internet cloud
-Comp2-----------------------------|
|