Hi guys i recently installed IPCOP on my server. I have set up the red interface to connect to the net and green on for the LAN. Here is the scenario the range of my IP for the red interface is the same as the green interface, example ( red interface 192.21.100.x to connect to the net and green interface 192.21.100.32 for the LAN). I tested the IP of the red interface with a stand alone pc and it connects to the net but when I placed the IP on IPCOP it seems that I'm not able to connect to the net. The IP of the red interface is the only IP allowed to surf the net.

Thanks for your help.

You don't put the ip of the red interface in ipcop, you just use the dhcp feature. I doubt your isp's ip range is 192.21.100.x.

we don't use a dhcp on our office. there is a specific ip that is only allowed to access the net which is defined in the red interface

Don't you mean you have setup IPCop on a dedicated firewall box with your server box downstream ie: on the orange or green interface?.