I recently tried to swap server from an ancient Asus PIII machine running Fedora-8 to a Dell PowerEdge T105 running Centos-5.1 . Unfortunately, I have not been able to set it up to allow local machines to access the internet. I can access the internet directly from the server (which connects to an ADSL modem) but not from a laptop connected to the server through an ethernet hub or WiFi router. I can ssh into the server from the laptop, but cannot ping anything beyond the server. It is as though there were a firewall running on the server which will not allow packets on the LAN to pass to the internet. This is probably a very ignorant question, but is there such a default firewall running under CentOS? I've gone back to my old server temporarily, but would prefer to sort out the new one if I could. Any advice or suggestions gratefully received.