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How To : Packet Filter to block IPs address from a blacklist

This How To shows the use of Packet Filter firewall in order to block ips thanks to a blacklist file, as PeerBlock does under Windows. Packet Filter has better performances than Netfilter.




Download a black list

We can download list from For example download the PrimaryThreats here. We need to unzip and format the file to make it work with Packet Filter.

# wget "URLtomyremotelist" -O
# unzip
cut -d ":" -f2 list.txt | grep -E "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}" > blocklist.tmp
sed -i 's/-/:/' blocklist.tmp
for i in $(cat blocklist.tmp); do echo "$i"; ipcalc -r "$i"| grep "/" >> blocklist; done
set limit table-entries 1000000
table <blocklist> persist file "/etc/blocklist"

pass out on $wan
pass in quick on $lan inet proto tcp from to any port { 80, 443 }
block quick log (all, to pflog0) on any from <blocklist> to
block quick log (all, to pflog1) on any from to <blocklist>
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