You can use the Cisco 2600 router and a hub to allow both computers to access the internet. 1) You will have to setup a static IP address on each of the computers. 2) You will have to set the defualt gateway on each of the computers to the IP address of the router. 3) You will have to set up a route in the router to route the computers IP's to the interface most likely Serial 0/0 or Serial 0/1 which is your T1 connection on the router. 3) The Cisco 2600 does not have a hub or switch built into it so you will need to use the hub that you have now. 4) Plug both ethernet cables from the computers into the ports on the hub, then plug one of the ethernet ports on the router to one of the ports on the hub.

I don't know the 2600 series routers that well but do believe they have NAT (Network Address Translation) built into them. Which allows each of your computers to share the one external IP address of your internet connection.

I hope this helps you out.
4mat