From: Jacob Yocom-Piatt (jy-pfixedpointgroup.com)
Date: Wed Aug 25 2010 - 17:27:48 CDT

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Don Tek wrote:
> I've recently implemented a firewall with two internet connections
> using multipath routing and round-robin outbound load balancing.
>
> I am looking for a solution from the shell to detect failure of these
> two internet gateways so I can force routing and pf changes from a
> script.
>
> I need something more robust than simply checking to see if the
> interface is up or down.
>
> I have managed a solution using traceroute that allows me to
> accomplish half of my goal. I can detect a failure and "down" that
> route, however, once I delete the default route from the routing table
> for the failed connection, I can no longer test it with traceroute.
> This is because it doesn't appear to me that OpenBSD's traceroute
> allows forcing an interface to work on.
>
> I am looking for better solutions from some of you more experienced
> users. Any suggestions are welcome.

ifstated

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