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Comment Linux Iproute2 is all you need (Score 3, Informative) 180

A few years back I did this with a colleague, we actually investigated 3 solutions; 2 commercial and one linux script based, in the end the one that won easily was the Linux script.

Basically using iproute2 and some nice scripts gives you the ability to load balance your outbound packets and then using some relatively simple scripts to monitor each remote peer for automatic failover.

A quick google turns up this blogger who sounds (from a quick skim) like he's doing the same thing:

Unfortunately I can't remember the commercial solutions we tested (this was 4-5 years ago!), but although they did exactly what you wanted perfectly, our problem was that we were doing this for a managed services company who ran 150+ IPSEC VPN's over those (at the time) 3 bonded ADSL connections, needless to say the commercial solutions had never imagined anyone trying to statefully balance that many VPNs! However with some tweaking (to be honest a LOT of tweaking) we got the Linux solution working a treat, even with nearly seamless failover.

Google is your friend on this one.

Every cloud has a silver lining; you should have sold it, and bought titanium.