Waiting 30s for the default route interface problem

/etc/rc.d/defaultroute

# vi /etc/rc.conf
synchronous_dhclient="YES"
background_dhclient="YES"

# /etc/rc.d/netif restart && /etc/rc.d/routing restart

http://gala4th.blogspot.com/2010/12/freebsd-howto-start-stop-restart.html