Dead gateway detection

Gabriel Gunderson gabe at
Tue Apr 12 21:52:28 MDT 2005

I'm setting up a box with two connections going out to different ISPs
for a small business in town.  The second was just for a backup but they
wanted to be able add its bandwidth to that of the first for out going
traffic.  On a failure the traffic goes out the one connection.

I think I have it all working but I'm still looking for an elegant way
to detect a dead gateway.  I have a cron job that uses ping to check
each gw.  It works but it's a little clunky and only checks every

What have you all done to detect dead gateways?


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