# Erlaube nur Router-Solicitation von CLIENT -> BATMAN
ebtables -A FORWARD -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type router-solicitation -j OUT_ONLY

# Erlaube nur Router-Advertisment von BATMAN -> CLIENT
ebtables -A FORWARD -p IPv6 --ip6-proto ipv6-icmp --ip6-icmp-type router-advertisement -j IN_ONLY