Dear All, I have followed these two guides in order to setup transparent caching using TProxy and Squid, but without any success. http://wiki.squid-cache.org/Features/Tproxy4 http://wiki.squid-cache.org/ConfigExamples/Intercept/CentOsTproxy4?action=show&redirect=ConfigExamples%2FTPROXYPatchingCentOS Actually, the following command fails: # ip route add local 0.0.0.0/0 dev lo table 100 RTNETLINK answers: File exists Is there any solution to this? Any suggestions? I have precisely followed the guides. It should be noted that I am trying to setup a normal scenario where the proxy box is connected to the internet using its default gateway and it has only one interface. Warm Regards, Ali Majdzadeh Kohbanani