dhclient/autoconf in singleuser vs. ramdisk kernel

Hi,

When booting bsd.rd I can do:

# ifconfig <if> inet autoconf

and it will negotiate a working IP and gateway setup from my DHCP
server.

However, when booting 'boot -s' (singleuser) the only way to have a
working IP and gateway setup is to specify it manually by entering the
specific relevant values, like:

# ifconfig <if> 12.34.56.78 0xffffff00
# route add default 12.34.56.1

Neither 'dhclient <if>' or 'ifconfig <if> inet autoconf' works.

What am I missing?

(The DHCP server assigns IP adresses based on MAC adresses. Not having
to "invent"/remember IP adresses for various machines would be
convenient)

Regards,

Erling