BIG-IP connection mirroring in public cloud doesn't work, but why?
Updated Jul 10, 2023
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Thanks for the writeup MichaelOLeary.
I will add that there are some other things to think about when looking to use connection-mirroring (TL;DR most times it's unnecessary):
# Settings 10 retry messages at one every 60sec
ServerAliveInterval = 60
ServerAliveCountMax = 10
Having said all that, if you do have a fastL4 wildcard routing-type Virtual Server *most* protocols tend to be fine unless its something in the middle of its transaction (e.g. database write, etc.)
I've helped customers deploy BIG-IP in Carrier Grade NAT scenarios (which is similar in some respects to a cloud-based environments) to be able to "seamlessly" fail devices or reboot so that subscribers are generally unaware their Internet is down: https://www.youtube.com/watch?v=hsb0OtqO_AM&list=PL5jC9WagzrjExq85JuWQHSUm9PegO3JmR&index=16