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Old 24th February 2018
bsd-keith bsd-keith is offline
Real Name: Keith
Open Source Software user
Join Date: Jun 2014
Location: Surrey/Hants Border, England
Posts: 181

I would imagine for practical purposes they would be too far out of date with the present systems, but for reading up on theory, some of it will still be relevant, but you might be better served looking out for a book on PF.
Linux since 1999, & also a BSD user.
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