Running this in a loop shows a steady increate in the mbuf zone, which goes away with this fix:
```
epair=$(ifconfig epair create)
epair=${epair%a}
ifconfig ${epair}a up
ifconfig ${epair}b up
ifconfig ${epair}a vhid 2 advbase 2 advskew 100 pass mekmitasdigoat alias 192.168.2.1/24
sleep 1
ifconfig ${epair}a destroy
```