I have a small network running with 10+ clients and Microsoft Small Business Server 2008 as the mail server, DHCP, DNS, File Sharing, SharePoint, etc. I have two internet connections of which one is a T1 and the other is a cable modem. I want to dedicate the T1 connection to the SBS2008 and have all the client machines access the internet through the cable modem. I would like to set it up this way so client internet traffic does not bog down the server's connection to the internet b/c I have a number of smart phones and vpn connections on any given day. The more bandwidth I can reserve for remote users the better.
My question is how do I do this while using SBS2008 as the DHCP/DNS server? I attempted using the clients/cable modem router as the DHCP server, but access the server was more problematic. Also, SBS2008 is a much better DHCP server than DD-WRT/router.
My network diagram is below. Any help would be appreciated.