[oclug] Auto ifdown / ifup

[Jonathan Earle]

> Is there a way to either:
> -constantly ping the internet, and if it is down, to run a 
> combination  
> ifdown / ifup script, when the connection is restored,

You could schedule a cron job to run every 5mins or so, which calls the
following script:

#!/bin/sh

host=<your gateway IP>
eth=eth0

if ! ping -c 1 $host > /dev/null; then
   # Can't reach gateway, assume link is dead and reset.
   /sbin/ifdown $eth
   /sbin/ifup $eth
else
   # We're good to go.
fi