This extension is loaded if `--protocol ipv6-icmp' or `--protocol icmpv6' is specified. It provides the following option:

--icmpv6-type [!] typename
    This allows specification of the ICMP type, which can be a numeric IPv6-ICMP type, or one of the IPv6-ICMP type names shown by the command
     ip6tables -p ipv6-icmp -h