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from the FreeBSD Handbook suggests that editing /etc/rc.conf enables DHCP. Unfortunately, some times this seems not sufficient.
Try a reboot, or start the DHCP client manually with the command
dhclient <network adapter>
You can find a list of network adapters by running ifconfig. Examples are em0 or lo0.
Posted by Dominik Schöler to makandra dev (2011-08-09 12:46)