Created attachment 221780 [details]
avoid multicast LEAVE
This patch sidesteps JOIN-LEAVE sequences as the kernel is probably hitting a hard limit at some point. Instead, remember that the JOIN was previously successful and in this case ignore the subsequent JOIN error.
See URL for details on lengthy OPNsense discussion.
Build and package info is available at https://gitlab.com/swills/freebsd-ports/pipelines/251741436
A commit references this bug:
Date: Fri Feb 5 00:54:21 UTC 2021
New revision: 564071
net/radvd: improve FreeBSD multicast patch for version 12 and up
Submitted by: Franco Fichtner <firstname.lastname@example.org>