I'd argue the commercial solutions are value for money, given the
complexities.
By I accept I am biased :-)
Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,237446,237457#msg-237457
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I urge caution using this approach to a data diode.
The question you ask is a very important one: where can I find a working
configuration?
Do not get me wrong, it is possible to make such approaches work, I have
seen them in my companies test lab.
The question you have to consider is reliabilit