Here's the procedure I usually go though to make sure the network settings
are correct:
1) Run the command "netstat -in" to see what interfaces are available. You
should see the network card (ex. eth0), and the loopback (lo). From this
list you can also see if any packets are being received (RX-OK) and
transmitted (TX-OK). You will also see if you are having network errors
and dropped packets. If your network interface does not show up on this
list, then the OS is not seeing it for whatever reason.
2) Run the command "ifconfig eth0" (if you interface is eth0 from the above
list). This will tell you a variety of information, most importantly is
the IP address (inet addr), broadcast (Bcast), and netmask (Mask). MAKE
SURE ALL OF THESE SETTINGS ARE CORRECT!!! Also, make sure you see the
labels "UP BROADCAST RUNNING MULTICAST" in this list. If not, your
card may be disabled. Try running "ifconfig eth0 up" in that case, then
check it again.
3) If the IP info is correct, make sure you can ping your own IP address from
the above list (ex. ping 192.0.0.1). You should see responses back from
the ping. This will tell you if the network card is responding to ping
requests (a good hardware check). If the card does not ping, then you
probably have a bad network card.
4) Run the command "netstat -r". This will show you the routing table.
Depending on your network you may or may not have a lot of entries in the
table, but the one you would be most interested in is the "default" destination.
This should point to your router. If this is not set, or not set to the
proper device, you will not be able to communicate outside your network.
If this is correct, make sure you can ping the router. If not, you could
have a cable problem, or your network jack is not connected properly. If
you can ping the router, then the problem is not with your machine. Call
the network administrator!
Darren Eckhoff
Dan Egli wrote:
>
> Question for you all (I'm new to this list, so forgive if this isn't the
> usual format or question style)
>
> I just installed Mandrake on a box at our office. Install went
> beautifully. After install, I verified the network settings (Gateway,
> netmask, IP, name servers, ect...)
>
> Everything looks exactly the same as it does on other linux boxes (except
> for IP, of course). But everytime I try to ping ANYTHING, I get an error,
> network is unreachable.
>
> The nic is configured and the module is loaded. ifconfig shows eth0 up
> (3c59x module for anyone who cares. Card is 3C905C-TX).
>
> Anyone got any ideas? I've checked and rechecked. Nothing. Network
> unreachable sounds like a config problem to me, but I cann't think of what
> else to check. I know the settings were wrong on install (my fat fingers
> entered 209 as the first octet vs 206 which it should have been) but I
> corrected it everywhere I could find in Linuxconf.
>
> I am very lost here. Any help is appreciated!
