I have not been able to read all of the opinions on this subject. I think people are
expending too much effort to something that is easily achieved. I also hope that I am
interpreting the original question correctly.
'Load Balancing' is a difficult objective. How about just distributing requests across
multiple firewalls. It is not very scientific but it is effective. I recommend using
something that is commonly referred to as, 'round-robin DNS'.
In your DNS, create 'A' records for each firewall. Then create several 'CNAME' records
with one alias that point to each of your 'A' records. Then aim all interested parties
to the CNAME. The result should be that every resolution of the same DNS query will
result in adifferent one of your firewalls. This doesn't try to balance the load but
it does distribute connections/processes.
Perhaps this is too simple!
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