Kamel, I used 1- For gre tunned, after loading ip_gre module at startup, I have this gre interface. You can copie it exactly the IP address in there doesn't matter. [root@cachedla network-scripts]# cat ifcfg-gre0 DEVICE=gre0 BOOTPROTO=static IPADDR=172.16.1.6 NETMASK=255.255.255.252 ONBOOT=yes IPV6INIT=no and 2- for ip tables -A PREROUTING -s My_Network/20 -d ! My_Network/20 -i gre0 -p tcp -m tcp --dport 80 -j DNAT --to-destination my_cache_server_IP:3128 This is where I was mistaken, after doing this it worked!! 3- Make sure your /etc/sysctl.conf is allright too # Controls IP packet forwarding net.ipv4.ip_forward = 1 # Controls source route verification net.ipv4.conf.default.rp_filter = 0 For more details on IP tables and GRE, please check these links ;) http://www.reub.net/node/3 http://www.squid-cache.org/mail-archive/squid-users/200510/0027.html Hope this helps, -- -------------------------- Daniel Epee Lea
