net/mpd5 on stable/14 - COMPAT_FREEBSD12 required?

From: Herbert J. Skuhra <herbert_at_gojira.at>
Date: Wed, 30 Aug 2023 13:29:28 UTC 
Hi,

after updating from stable/13 to (main and later to) stable/14
net/mpd5 only connects to my ISP (VDSL with VLAN) if I enable "options
COMPAT_FREEBSD12" in my kernel. Without I get only:

Aug 30 15:08:06 gw mpd[59876]: [L1] PPPoE connection timeout after 9 seconds
Aug 30 15:08:06 gw mpd[59876]: [L1] Link: DOWN event
Aug 30 15:08:06 gw mpd[59876]: [L1] LCP: Down event
Aug 30 15:08:06 gw mpd[59876]: [L1] Link: reconnection attempt 1 in 7 seconds
Aug 30 15:08:14 gw mpd[59876]: [L1] Link: reconnection attempt 1
Aug 30 15:08:14 gw mpd[59876]: [L1] PPPoE: Connecting to ''
Aug 30 15:08:23 gw mpd[59876]: [L1] PPPoE connection timeout after 9 seconds
Aug 30 15:08:23 gw mpd[59876]: [L1] Link: DOWN event
Aug 30 15:08:23 gw mpd[59876]: [L1] LCP: Down event
[..]

I guess the problem is:

Without "COMPAT_FREEBSD12" vlanproto = 0x0000. If I run "ifconfig
vlan31 vlanproto 802.1q" mpd5 works.

--
Herbert