Building The Network You Need With PF, The OpenBSD Packet Filter: BSDCan 2016, Ottawa, Canada, June 8th 2016
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Anchors: Rule Set

Include from file

In your pf.conf

anchor ssh-good
     load anchor ssh-good from "/etc/anchor-ssh-good"

/etc/anchor-ssh-good

table <sshbuddies> file "/etc/sshbuddies"
     pass inet proto tcp from <sshbuddies> to any port ssh

/etc/sshbuddies

192.168.103.84
10.11.12.13