ipfw + igmp

From: Gerard E. Seibert <jerry_at_seibercom.net>
Date: Sun, 15 Sep 2024 20:38:23 UTC 
On FreeBSD, IPFW supports both protocols "ipv6-icmp" and "icmp". It also
supports "igmp". I do not see any support for IPv6, however. Is IPv6
not needed for "igmp"?

Thanks!