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 From:  Melvin Backus <mbackus at bellsouth dot net>
 To:  "Sam Stauffacher" <sam at wuzzysoftware dot com>, <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] Duplicating traffic to two servers and rerouting traffic dynamically
 Date:  Fri, 30 Apr 2004 22:49:08 -0400
At 10:44 PM 4/30/2004, Sam Stauffacher wrote:
>I have this little dream of how I might be able to sleep better at night, it
>goes like this:
>I have two servers on my network, one is my primary server, and the other is
>a backup. I'd like M0n0 to duplicate all traffic going to my primary server
>to my backup server (real-time synchronization), and if my primary server
>crashes, to dynamically reroute traffic to my backup server. I suppose one
>way would be to continuously ping my primary server, and if it fails, reset
>traffic to my backup. I'm not too sure about duplicating traffic though.
>Could this hack possibly be done using PHP?
>If someone cares to pinch me, please do.

Sounds like precisely one of the reasons clustering would be used.  The 
cluster has 1 IP address and handles all the other stuff for you.  Not 
quite the answer you're looking for I suspect, but a possible solution 
depending on your environment.

Good, Fast, Cheap... Pick any two