gluon-packages/gluon/gluon-ebtables-filter-ra-dhcp/files/lib/gluon/ebtables/200-dir-dhcpv4

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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