The BSD code did not propagate the OS-level IFF_MULTICAST flag to the Bird-internal IF_MULTICAST flag, which causes problems with Wireguard interfaces on FreeBSD. The Linux sysdep code does propagate the flag already, so just copy over the same check and flag update. Tested-by: Stefan Haller <stefan.haller@stha.de> Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk> --- sysdep/bsd/krt-sock.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sysdep/bsd/krt-sock.c b/sysdep/bsd/krt-sock.c index c2faa23dd44f..cd89544063c7 100644 --- a/sysdep/bsd/krt-sock.c +++ b/sysdep/bsd/krt-sock.c @@ -665,6 +665,9 @@ krt_read_ifinfo(struct ks_msg *msg, int scan) else f.flags |= IF_MULTIACCESS; /* NBMA */ + if (fl & IFF_MULTICAST) + f.flags |= IF_MULTICAST; + iface = if_update(&f); if (!scan) -- 2.31.1