[plug] ADSL with modem backup

[Paul Dean]

Hya Luke,

I've too have given some thought to this and found the need for a simple
'ping' daemon to be running, or by cron to test the link at set
intervals, say every 5 mins.
If the link is unreachable for, like you said 30 mins you just run `ifup
ppp1` with all the right cfg files in place and the 'ping' script keeps
running and when the adsl link is back up you bring down `ifdown ppp1`
your PSTN link.

A fairly simple perl script using Net::Ping would suffice, you could
then build a daemon to run too with full networking tests builtin.

You are using pppoe stuff then it comes with 'adsl-status' you
incorporate that into your test as well.

How's you bash/perl scripting?


On Thu, 15 Aug 2002, Luke Dudney wrote:

> I'm trying to build some fault tolerence into a remote ADSL connected 
> RedHat 7.3 machine.
> 
> Has anyone here successfully implemented an ADSL connection with a PSTN 
> modem dial-out as a backup?
> What I'm looking for is some sort of method to detect an ADSL outage 
> (for a set period of time - say 30 minutes) and then automatically dial 
> the modem.
> I want to continue testing the ADSL connection, and if it succeeds then 
> drop the modem line, reset default route etc.
> 
> I'm using the standard setup scripts with RP-PPPOE to dial the adsl 
> connection.
> Are there any scripts available on the web that either achieve this or 
> demonstrate in some other way how it could be achieved?
> Or does anyone have any other thoughts?
> 
> Cheers
> Luke.
> 

-- 
Paul...

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