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h1. IPTables

* http://www.bortzmeyer.org/dns-netfilter-u32.html
* http://www.stearns.org/doc/iptables-u32.current.html
* http://ebtables.sourceforge.net/br_fw_ia/PacketFlow.png
* http://ebtables.sourceforge.net/

DHCP ?
sysctl -w net.bridge.bridge-nf-call-iptables=1
sysctl -w net.bridge.bridge-nf-call-ip6tables=1
iptables $IP4T -A INPUT -p udp --sport 68 --dport 67 -j DROP

h1. ebtables

* http://serverfault.com/questions/284290/two-dhcp-servers-block-clients-for-one-of-them