What is Reddit's opinion of The Book of PF, 3rd Edition: A No-Nonsense Guide to the OpenBSD Firewall?

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I would recommend The Book of PF: 3rd Edition. Also, even though this page isnt updated any longer it is helpful: http://www.bsdnow.tv/tutorials/openbsd-router

Here is my /etc/pf.conf file with some minor alterations:

ext_if="bge0" int_if="bge1" dmz_if="bge2" int_net="10.10.199.0/24" dmz_net="172.30.67.0/24" broken="224.0.0.22 127.0.0.0/8 192.168.0.0/16 172.16.0.0/12 \ 10.0.0.0/8 169.254.0.0/16 192.0.2.0/24 \ 198.51.100.0/24, 203.0.113.0/24, \ 169.254.0.0/16 0.0.0.0/8 240.0.0.0/4 255.255.255.255/32" set optimization aggressive set block-policy return set skip on { lo } queue main on $ext_if bandwidth 10M queue defq parent main bandwidth 2500K default queue web parent main bandwidth 7100K queue icmp parent main bandwidth 400K antispoof for { $ext_if, $int_if, $dmz_if } match in all scrub (no-df random-id max-mss 1440) match out on $ext_if set prio (5, 6) match out on $ext_if proto tcp to port { www, https } \ set queue web match out on $ext_if proto icmp queue icmp match out on $ext_if from !($ext_if:network) to any nat-to ($ext_if:0) block in log on $ext_if pass out block in quick on $ext_if from { $broken no-route urpf-failed } to any block out quick on $ext_if from any to { no-route $broken } pass on { $int_if, $dmz_if } pass in quick on { $int_if, $dmz_if } inet proto tcp to port ftp \ divert-to 127.0.0.1 port 8021 block proto tcp from any to any port 1688 block log from $dmz_net to $int_net