Simplest failover solution for iptables firewall (router)

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Hi,
Now that I have my policy-based routing NAT FW working as expected
(thanks for everyone's previous comments!), I would like it to be
resilient. The more I think about it the less I want to bother with
true HA (so keeping track of connections). My solution can handle
20-30 seconds of downtime with no real problems. And if on the odd
occasion it went up to 2-3 minutes it wouldn't actually be that much
of a biggie either. Basically, I just don't want to be woken up at
3:54am on a Tuesday morning because of a kernel panic :-). If it can
wait t'ill 7:30 then that is all the resilience I actually need.
The keys here are simplicity and resources. It should be as simple as
possible, and shouldn't require very much in terms of memory and
processor resources. I could possibly even get away with scripting
something up in bash but I would much rather not as I'm very lazy :-).
Does anyone have experience with such a setup? It looks as though at a
minimum there is keepalived and pacemaker+heartbeat. Is one
better/worse for a specialised firewal box?
Thanks
Anton
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