ICMPv6 Firewall Rules Allow in ICMP messages (highly recommended) ip6tables -A INPUT -p ipv6-icmp -m icmp6 --icmpv6-type 128 \ -m --comment Permit-EchoRequest -j ACCEPT ip6tables -A INPUT -p ipv6-icmp -m icmp6 --icmpv6-type 129 \ -m --comment Permit-EchoReply -j ACCEPT