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Routing internet through Comcast Router

We have a comcast router put in and we want to be able to have just our internet go out through. DHCP and DNS are set up through the server on our side. Is it possible to have just the internet pointing through comcast? While being able to see the main server which is routed through our cisco router and ran to another office through a T1 line.
1 Solution
The Cisco router should have more specific routes pointing through the T1 line.  The router would have a default route that would point towards the Comcast connection.  Whether you do this statically or dynamically depends on the scale of your network, but it sounds like this could easily be done with static routes.

ip route <internal net> <next-hop IP to get to that internal net>
ip route <Comcast router>

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