ok, so... even after setting TAP22:
The following is not working, still seeing DHCP signal from both sides
NOT WORKING:
ebtables -I INPUT -i tap22 -p IPv4 --ip-protocol udp --ip-destination-port 67:68 -j DROP &
ebtables -I OUTPUT -o tap22 -p IPv4 --ip-protocol udp --ip-destination-port 67:68...