How do i know whether my NIC works or not?

Christian Schult cschult at
Wed Dec 30 17:31:09 UTC 2009

Hello arshad,

arshad wrote:

> On Wed, 2009-12-30 at 14:44 +0100, Christian Schult wrote:

> > Your interface eth0 is now in the same network as your router (you've
> > stated in a previous mail, maybe in another thread, that the router has
> > So he must be reachable now if he is up and running.
> > 
> > We have now:
> > 
> > 1 the NIC is known by your kernel as Realtec something, lspci showed the
> >   device.
> > 2 the NIC is set up now as eth0 with ip
> > 3 the router has ip
> > 4 ping is routed through eth0 but the router is not reachable
> >   for ping, i fear it not even does not respond to ping but is
> >   completely unreachable
> > 
> > Are you sure the ruter has ip
> > 
> > Please check the ethernet cable between your PC and the router, perhaps
> > you can replace it with an other one.

> yes, the router page was not reachable even through the browser,
> the router cable is ok and i checked with another one too.
> do you think,
> i should format and see? (booting from live cd didn't work though)
> or replace with a new router?

If formating means installing Ubuntu again - no, don't do this, it's not
necessary. This is not W*ndows.

But i must say, i've got no more idea what to try out now.
Do you have a firewall running on your desktop pc?

What gives:

$ /sbin/ifconfig
$ route -n
$ sudo /sbin/iptables -nL

Do you have other computers in your network which can connect to the

Is the router running? Did you try to reboot the router (plug power off
and on after a few seconds)?


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