dial on demand when ethernet fails

["Paul Miller" <paul@pinheiro.tcimet.net>]

Hello!
I'm trying to setup my linux gateway to dialup if the ethernet connection to
the internet fails.  When the ethernet connection is restored, network
traffic should be rerouted and the dialup connection should be disconnected.

I'm running kernel 2.4.18 w/ iptables and latest debian 'testing' distro.
PPP connections are working, so I just need a good way to (1) detect when
the ethernet connection dies (down for more than 1 min or so), (2) reroute
to slip device (diald), (3) detect when ethernet comes back up, and finally
(4) reroute back to ethernet.  I think diald will take care of dialing on
demand (I don't want to dial if there is no network traffic) and
disconnecting.

Does anyone have a setup similar to this?  Any suggestions?

Thanks!
-Paul



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