I use bridged mode without issue. Does it change number every reboot? If I remember correctly the last time this happened to me I updated freenas to latest version and rebooted. I'm assuming you have done this. You could also try blowing away vbox and just rebuild it. Doesn't take long.
You should see the epairs applied each reboot in the console and they should be the same each time. It's possible some other jail is screwing things up as well.
You should see the epairs applied each reboot in the console and they should be the same each time. It's possible some other jail is screwing things up as well.