Hello To All

First of all I am new to Linux and I want to make Squid Proxy Server.

I have 2 NIC eth1 for public ip (internet) and eth0 for lan ip

but the problem is that I have connected my eth1 to the DSL Router and on the server machine browsing is perfect and i have no issue but when i connect client machine to the server i can perfectly ping my public ip NIC but can't ping DSL router.

I don't have any idea why,

Please help me in this regard...