- rule 'FORWARD -p IPv4 --ip-protocol udp --ip-destination-port 67 -j OUT_ONLY'
- rule 'OUTPUT -p IPv4 --ip-protocol udp --ip-destination-port 67 -j OUT_ONLY'
- rule 'FORWARD -p IPv4 --ip-protocol udp --ip-destination-port 68 -j IN_ONLY'
- rule 'INPUT -p IPv4 --ip-protocol udp --ip-destination-port 68 -j IN_ONLY'
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