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They can block particular traffic by MAC too but I think this is not the case.I think I must explain few things here.On the Linux box ie. which you are using as server to your LAN.If its running NAT script i provided or any other NAT script then.eth0 = internetShould have gatway as given by your ISP, DNS as given by your ISPShould have IP & subnet mask as given by your ISP.eth1 = Your LAN.Should have IP & subnet mask you set for your LAN ie part of LAN.No other configuration is required on this interface.Now..Your client :Be it any OS wheter Linux or Windows or MAC OS.Should have IP & subnet as part of lanGateway = IP of eth0 of Linux machine.DNS = either your ISP's or your Linux box if in that DNS forwarding is enabled.In Redhat and fedora its mostly by default. You only have to make a separate entry in resolv.conf.Code: [Select]nameserver 127.0.0.1Now you may compare your setup with above and if its identical to it then should work and later you can configure or enable squid too.
nameserver 127.0.0.1