[K12OSN] Network unreachable.

[Les Mikesell]

Accessys at smart.net wrote:
> had to shut my system down yesterday and when I rebooted everything
> was working fine except accessing the network.
> 
> keep getting the error code
> 
> SIOCADDRT: network is unreachable
> 
> I can ping my cards and the blinking lights on the router appear to be
> correct. so what is this' I thought I had seen every error code
> possible but then another.  it really has me stumped, tried I think
> all the standard fixes and am getting nowhere fast.

If your /etc/sysconfig/network-scripts/ifcfg-eth? files don't have the 
right HWADDR to match your NIC cards (for example if you cloned a disk 
from a different machine or swapped cards after setup), the system can 
detect them in the wrong order and even use interfaces you had not set 
up.   The 'mii-tool' command will show which interfaces have link active 
. If you can't ping your router, try checking one cable at at time to 
make sure you have link on the right interface name and that ifconfig 
shows that it has the expected IP address.

-- 
   Les Mikesell
     lesmikesell at gmail.com