Been juggling hardware, moving VMs and jails around, and I shoehorned myself into a bit of an odd situation.
I had two Intel NUCs, one is a weaker Celeron CPU, with a meager 4 GB ram. The other is a beast with a much better CPU and 32 GB of ram.
The one with the 32 GB and strong CPU has the easy job, and the weak one has the hard job.
The easiest solution was to swap their drives, and network cables.
The only software change I had to make?
sed -i bak s/re0/em0/g /etc/rc.conf
on the first one
and, shocker.....
sed -i bak s/em0/re0/g /etc/rc.conf
That was _it_. Both systems came up clean because the #FreeBSD network subsystem isn't a clusterfuck.
That doesn't work in Linux.