How To Set Up Squid in Midle of Router and PCs with Two Interfaces?

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http://serverfault.com – Currently, I have server machine connected to the router directly through its primary nic. The second nic is connected to a switch which will be used to connect other PCs. Currently, except for the server, other machines doesn't have internet access. How to setup the server to Allow net access to other PSc To act as a transparent proxy (I will be using qlproxy to filter the content) I know how to setup qlproxy but can you please tell me how to set up the other things? Any tutorials? Guides? The server is running Ubuntu 12.10! (HowTos)