Well if you wanna do that, here is the last post that was raised the topic:
http://pubnet.lrc-wireless.com/forum/index.php?topic=430.0


-----Original Message-----
From: Philippe Lamalice [mailto:plamalice at videotron dot ca] 
Sent: Wednesday, March 14, 2007 3:50 PM
To: Alex M
Subject: Re: [m0n0wall] Dual WAN

You could write a script that pings your host every X seconds.
If the ping times out, then modify the rules accordingly.

Search the list archives for "poor man's" script.



Alex M wrote:
> I don't think fail over supported in, mono. You might want to use pfsense
> for that.
>
>
>
>
> -----Original Message-----
> From: cyber nat [mailto:cybernat at gmail dot com] 
> Sent: Wednesday, March 14, 2007 2:07 AM
> To: m0n0wall at lists dot m0n0 dot ch
> Subject: [m0n0wall] Dual WAN
>
> Hi all,
>
> This is my setup.
>
> Site A monowall_A1, internet connection very stable. never goes down:
>
> WAN ip: 60.60.49.238 (static, one public IP only)
> LAN IP: 172.18.24.205
> OPT1 - not configured
>
>
> Site B has 2 monowalls with both of them LAN port connected to a same
> switch:
>
> monowall_B1:
>
> WAN IP: 202.188.5.186 (static, one public IP only)
> LAN IP: 192.168.0.1
> OPT1 - not configured
>
> monowall_B2:
>
> WAN IP: 60.38.60.100.94 (static, one public IP only)
> LAN IP: 192.168.0.2
> OPT1 - not configured
>
>
> I've created an site-to-site IPSEC tunnel from Site B to Site A:
> (monowall_B1 <---> monowall_A1)
>
> Users in Site B will be able to access servers in Site A thru the
> tunnel(default gateway is 192.168.0.1)
>
> Whenever an internet connection on monowall_B1 goes down, I'll manually
> switch the tunnel to (monowall_B2 <---> monowall_A1)
> Users will change their pc gateway to 192.168.0.2 and they be able to
access
> servers in Site A again.
>
> Please point me to a documentation on how to do failover on my current
setup
> of Site B. Manually switching the tunnel is very tedious.
> Any assistance is greatly appreciated.
>
>
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>