Further digging in journalctl shows:
-- Unit systemd-networkd.service has begun starting up. Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-lan: netdev ready Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-net: netdev ready Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-peer: netdev ready Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-plein: netdev ready Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-protea-2: netdev ready Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-protea: netdev ready Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-peer: Gained IPv6LL Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-plein: Gained IPv6LL Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-protea-2: Gained IPv6LL Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: bond-protea: Gained IPv6LL Mar 02 20:37:00 4-ridge-fw1 systemd-networkd[6851]: Assertion 'link->state == LINK_STATE_SETTING_ADDRESSES' failed at ../src/network/networkd-link Mar 02 20:37:00 4-ridge-fw1 systemd[1]: systemd-networkd.service: Main process exited, code=dumped, status=6/ABRT Mar 02 20:37:00 4-ridge-fw1 systemd[1]: systemd-networkd.service: Failed with result 'core-dump'. Mar 02 20:37:00 4-ridge-fw1 systemd[1]: Failed to start Network Service.
Further digging in journalctl shows:
-- Unit systemd- networkd. service has begun starting up. networkd[ 6851]: bond-lan: netdev ready networkd[ 6851]: bond-net: netdev ready networkd[ 6851]: bond-peer: netdev ready networkd[ 6851]: bond-plein: netdev ready networkd[ 6851]: bond-protea-2: netdev ready networkd[ 6851]: bond-protea: netdev ready networkd[ 6851]: bond-peer: Gained IPv6LL networkd[ 6851]: bond-plein: Gained IPv6LL networkd[ 6851]: bond-protea-2: Gained IPv6LL networkd[ 6851]: bond-protea: Gained IPv6LL networkd[ 6851]: Assertion 'link->state == LINK_STATE_ SETTING_ ADDRESSES' failed at ../src/ network/ networkd- link networkd. service: Main process exited, code=dumped, status=6/ABRT networkd. service: Failed with result 'core-dump'.
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd[1]: systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd[1]: systemd-
Mar 02 20:37:00 4-ridge-fw1 systemd[1]: Failed to start Network Service.