A few days ago I my connection stopped working... I connect to internet thru a cablemodem connected to my ethernet card in eth0 by DHCP, and I share it with other two computers by eth1 and 2...

When my pc boots, i get random ip from eth 0, 169.xxx.xxx.xxx, but if type "sudo dhclient eth0" i get IP, but still no connection and if try to ping any host, i get "operation not permitted", even with sudo...

Some other clues!... if i boot with debugger mode, i can ping internet directions and my router, but as soon as i boot, all is gone. I also noticed that when the system is starting, appears a message like this: Net.Ipv4.ip-forward caused and invalid argument...

well any advices are welcomed

As I passed a clearance rack of $20 routers at walmart... I'd probably just invest 20$ in a cheap router and let it do the sharing...

Yes... that would be possible if i lived in US... but, no, i live in Argentina, everything here is very expensive and i can afford a router...

and the problem is not with the sharing... it's related to dhcp client, which gets ip, although internet doesn't work...