I am using mac leopard.
When connected to a wireless network using my airport, sometimes the network stops, and I get a 'self assigned ip"
The wireless network works for other people, and it worked for me to before I got a "self-assigned-ip"
so I go to 'system preferences' -> 'network' -> 'advanced'-> 'tcp/ip'
and click 'renew dhcp lease' and this sometimes corrects my 'self-assigned-ip' (which always begins with a '1')
And sometimes my network stays as a 'self-assigned-ip'