Firewall and ips theory, resource

[a bv <vbavbalist () gmail com>]

Hi,

I would like to have your book recommendation about firewalls and ips
theory (not how to use a vendors fw) to get the deep knowledge.
Cause day by day though you use-manage the firewall , you can also get
far way the insides. There were limited books about them at old times
but now adays you may know some which are great ( i dont wanna spend
my money for nothing).

Regards

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