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UNIX Firewalling Engines and Queuing :: Chapter 13. Policy Routing, Bandwidth Management, and QoS :: Integrated cisco and unix network architectures :: Networking :: eTutorials.org
APNIC - Useful and fun features related to the #OpenBSD packet filter: https://blog.apnic.net/2021/11/11/openbsd-part-3-that-packet-filter/ | Facebook
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