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openbsd pf block ip address

FreeBSD / OpenBSD: PF Firewall Filter Large Number Of Subnets and IP Address

Q. How do I filter larger number of subnets and IPs using OpenBSD’s pf firewall under FreeBSD 7.x server? How do I log all dropped packets from such ips? How do I block upto 10000 IPs or subnet without any performance penalty?
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