Like everyone said 127.0.0.1 is the local loopback address. 127.* is reserved specifically for this. The only good thing about pinging yourself is it can tell you if tcp/ip is properly configured on your network card. So, if you can't ping yourself and you don't have a firewall, something might be off in your tcp/ip settings. THats not to say it won't work....it just means that something may be misconfigged.