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public text v1 · immutable-p IPv4 -i theguy --ip-src 1.2.3.4 -j ACCEPT # allow IPv4 traffic with proper source
-p IPv4 -i theguy --ip-src 0.0.0.0 --ip-dst 255.255.255.255 --ip-proto udp --ip-sport 68 --ip-dport 67 -j ACCEPT # allow DHCP broadcast requests
-p ARP -i theguy --arp-ip-src 1.2.3.4 -j ACCEPT # allow arp requests/replies with proper source
-i theguy -j DROP # drop everything else