Incoming from T:
I'm using grml 0.7 for quite a while. But this morning I woke up to find that I can't access my Internet anymore. Everything was fine last night and I didn't touch anything...
Here are the symptoms:
% /etc/init.d/networking restart Reconfiguring network interfaces...ifup: interface lo already configured done.
Why the message only says interface lo, but not eth0?
$ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.2.0 * 255.255.255.0 U 0 0 0 eth0 default 192.168.2.1 0.0.0.0 UG 0 0 0 eth0
$ ping grml.org ping: unknown host grml.org
Always ping the IP address when you get "unknown host." The above only tells you DNS isn't working. "ping -c 1 81.223.126.153" goes around DNS.
So, what's in your /etc/resolv.conf?
Note that the "default" line from route took a long time to show up, so is the "unknown host" line from ping.
DNS problem.
% ifconfig eth0 down
$ ifconfig -a eth0 Link encap:Ethernet HWaddr 00:11:2F:BE:4B:BA inet addr:192.168.2.13 Bcast:192.168.2.255 Mask:255.255.255.0 [snip] Ie, I tried to shut down the eth0, but, should it be gone from "ifconfig -a" output?
Yes.
I tried to regain dhcp leases but that didn't help.
"... didn't help" means what? What did dhcp do, what was the result (messages), etc?
By then, I ran out of ideas so I rebooted. However, same things happened, and I still can't get onto the Internet.
Note that the Internet is working fine. The other machine that's using the same router worked fine. Also, AOK when I boot back to Debian.
Good to know; I'd have suggested frobbing (power cycling) the router next. Not necessary.
Please help. It's urgent.
You have two computers, one of which works fine. How can this be "urgent"?