Documentation
Allow DHCP through IPTables
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To allow DHCP through IPTbales and IP6Tables run the following commands:
iptables -I INPUT -i eth2 -p udp --dport 67:68 --sport 67:68 -j ACCEPT
ip6tables -I INPUT -i eth2 -p udp --dport 67:68 --sport 67:68 -j ACCEPT
service iptables save
service ip6tables save