FreeBSD 10 Hyper-V DHCP not working after install / reboot

After installing FreeBSD on a Hyper-V machine I had no network connection.
The solution is to modify rc.conf that DHCP will always work on boot
  1. Edit /etc/rc.conf:
  2. Comment the following with a “#”:  ifconfig_YOURNICID
  3. Add the following:  ifconfig_YOURNICID=”SYNCDHCP media 100baseTX mediaopt full-duplex”
  4. Save
  5. Done