[plug] ADSL failover

[Simon Scott]

	Thanks Colin, I knew there'd be a way

	Ill write up some scripts tonight (although Ive never used sed and
awk, but I guess a visit to the man pages will help).

	Actually, wouldnt ping return 0 on success and an error code on
failure? Can you determine the return value through bash scripting?

	Anyhow, thanks, Ill read up on route, sed, and awk, and return my
results for approval ;)





	From:	Colin Muller <colin at twobluedots.com.au> on 21/08/2001 05:56
PM
	Please respond to plug at plug.linux.org.au@SMTP at Exchange
	To:	plug at plug.linux.org.au@SMTP at Exchange
	cc:	 

	Subject:	Re: [plug] ADSL failover


	Simon, what you probably want for failover is to ping/traceroute via
	the eth-whataver port (the default route one for the ADSL) to a
	specific machine every couple of minutes (using cron, I guess) and
	parse the result.  If it indicates failure, delete the default
route,
	substitute a more slimly-masked route via that same Ethernet port to
	the machine you're (trac|ping)ing, and fire up the ppp connection
with
	a default route through ppp0. Keep (trac|ping)ing the other one via
the
	ADSL eth port, and when it comes back up, kill the ppp link and
	reinstate the default route via the ADSL connection. All not too
hard
	to automate. Note that this is useless for incoming traffic to a
fixed
	IP - that would require routing co-operation from your ISP. It would
	work well for Web browsing etc, though.

	Colin




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