strange network behaviour - need help troubleshooting

[marsf]

Ok, this is a very strange network problem, and I am having some trouble debugging it. I was hoping that someone here could help me shed some light on the situation.

My setup involves a few Windows 2000 Pro computers and my Gentoo Linux box on a small LAN behind a Netgear router. I use ADSL to access the internet. For some reason my Linux computer can no longer contact anything on the other side of the router. I can't ping my ISP's DNS servers or anything close by, using either name resolution or IP numbers.

However, the Linux computer works perfectly on the local LAN. I can connect to the other computers as if nothing is wrong; SMB, SSH all run fine on the local LAN. What really has me scratching my head is that all of the Win2K machines still work perfectly! (I am writing this post from the Win2K machine running beside my Linux box)

I check the router and there are no rules to block outgoing traffic from my computer's IP. So why the heck can't Linux do anything outside of the router, but Win2K works normally? ifconfig and netstat seem to look normal, and a reboot led to a normal boot up process. And my logs are clean.


I'm lost on this one. Any help would be greatly appreciated!

Mars

[caffiend]

what does

[marsf]

netstat -nr gives me a normal routing table:

bash-2.05b# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
192.168.0.0 0.0.0.0 255.255.255.0 U 40 0 0 eth0
0.0.0.0 192.168.0.1 0.0.0.0 UG 40 0 0 eth0

I'm guessing that this is normal. I completely forgot to check the gateway and routing tables. Now that I think about it they are an obvious place to start looking for trouble for a problem like the one I had.

Strange behaviour indeed. I left my computer on overnight and the problem had resolved itself this morning.

Thank you for the help though! If it happens again I will know the first place to look!