Two Internet Connections on one LARGE network

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Two Internet Connections on one LARGE network

I oversee the IT department at a small college(about 80 students and 40 total staff)

Currently we have one 2mbps dedicated line (similar to a t1)
I am now adding an additional internet connection (4mbps adsl line)

The idea is to use the dedicated 2mbps line for our web and VOIP phone servers while the 4 mbps dsl line will be used purely for internet surfing using our current inet proxy server.

Our current router is a Cisco serial style router while the new ADSL connection will use a standard cat5 router. My current router is and all the servers have this for their gateway. The inet server gives out dhcp on the same IP scheme but sets the gateway to so all surfing traffic goes through the inet proxy server (

So my question is this. Can I just put the new ADSL router into the network as say and just change the gateway on the inet side of my proxy server to to send all surfing traffic to the new connection? Will this affect anything on the network I should worry about? Any thoughts suggestions or will my idea work without any issues?

On another note. Our web server runs moodle which is an educational homework/assignment program which uses an inet browser for submissions, grading, etc. on the server. It needs to be accessible from inside and outside. It currently is, we keep internal by using a host file on the wingate proxy server, this should not be affected though I believe.