1. Access Control in ONOS Controller.
https://wiki.onosproject.org/display/ONOS/Access+Control+Based+on+DHCP
2. Firewall Application in Floodlight Controller.
https://floodlight.atlassian.net/wiki/spaces/floodlightcontroller/pages/1343616/Firewall
3. Floodlight DHCP Proxy Service.
https://github.com/floodlight/floodlight/tree/master/src/main/java/net/floodlightcontroller/dhcpserver
4. Floodlight ProxyARP.
https://github.com/mbredel/floodlight-proxyarp
5. Manchester Code.
https://en.wikipedia.org/wiki/Manchester_code