On Wed, Dec 10, 2003 at 02:24:31PM -0500, Andrea Venturoli wrote:
> I have a server with two ISP connections: a flat ADSL with an ISP and 
> pay-per-traffic HDSL with another.
> I'd like to use ADSL whenever possible, but switch to HDSL in case the first line 
> drops.

I don't know of anything published that does this, but it's easy to
write a perl or shell script that pings the router at the adsl isp
and does the necessary things when it disappears and reappears.  You
start it from /usr/local/etc/rc.d (Hint - use nohup to keep it running).

Without getting much fancier than is reasonable, existing connections
will be dropped at switchovers.

I have a script that does similar things running here; email me if you
want it.

-- 
Barney Wolff         http://www.databus.com/bwresume.pdf
I'm available by contract or FT, in the NYC metro area or via the 'Net.
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