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DHCP Client Setup
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1. Create two empty file /etc/hostname.xxx and /etc/dhcp.xxx for each
interface, where xxx is interface name, like le0, hme0. For more
than one interfaces you can create both files for each interface.
In this example I am creating le0 and le0:1 (virtual interface).

client# touch /etc/hostname.le0 /etc/hostname.le0:1
client# touch /etc/dhcp.le0 /etc/dhcp.le0:1

client#ls -l /etc/*.le*
-rw-r--r-- 1 root root 9 Mar 18 1997 /etc/hostname.le0
-rw-r--r-- 1 root other 11 Oct 23 11:33 /etc/hostname.le0:1

client# ls -l /etc/dhcp.*
-rw-r--r-- 1 root root 0 Oct 24 09:11 /etc/dhcp.le0
-rw-r--r-- 1 root other 0 Oct 27 09:11 /etc/dhcp.le0:1
client-1#

2. After creating these files you can setup you can reboot the machine
or you can use ifconfig command to configure the interface.

client# ifconfig le0 dhcp start
client#
client-1# ifconfig -a

lo0: flags=849<UP,LOOPBACK,RUNNING,MULTICAST> mtu 8232
inet 127.0.0.1 netmask ff000000
le0: flags=4843<UP,BROADCAST,RUNNING,MULTICAST,DHCP> mtu 1500
inet 129.145.71.1 netmask ffffff00 broadcast 129.145.71.255
ether 8:0:20:7d:5f:a2
client-1# ifconfig le0:1 dhcp start
client-1# ifconfig -a

lo0: flags=849<UP,LOOPBACK,RUNNING,MULTICAST> mtu 8232
inet 127.0.0.1 netmask ff000000
le0: flags=4843<UP,BROADCAST,RUNNING,MULTICAST,DHCP> mtu 1500
inet 129.145.71.1 netmask ffffff00 broadcast 129.145.71.255
ether 8:0:20:7d:5f:a2
le0:1: flags=4843<UP,BROADCAST,RUNNING,MULTICAST,DHCP> mtu 1500
inet 129.145.71.2 netmask ffffff00 broadcast 129.145.71.255

3. Release an interface.

client-1# ifconfig le0:1 dhcp release
client-1# ifconfig -a

lo0: flags=849<UP,LOOPBACK,RUNNING,MULTICAST> mtu 8232
inet 127.0.0.1 netmask ff000000
le0: flags=4843<UP,BROADCAST,RUNNING,MULTICAST,DHCP> mtu 1500
inet 129.145.71.1 netmask ffffff00 broadcast 129.145.71.255
ether 8:0:20:7d:5f:a2
le0:1: flags=842<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 0.0.0.0 netmask 0
you can bring that interface back up again as:

client-1# ifconfig le0:1 dhcp start

To get status on any dhcp interface:

client-1# ifconfig le0 dhcp status

Interface Status Sent Received Rejects
le0 BOUND 1 1 0
(Began,expires,Renew) =(10/28/1997 22:05,10/30/1997 10:05, 10/29/1997 16:05)

There are other commands with ifconfig command that you can use:

/usr/sbin/ifconfig interface { auto-dhcp | dhcp }
[ primary ] [ wait seconds ]
drop | extend | ping | release | start | status


Also refer to ifconfig man pages.

client-1#
client-1# cat /etc/hosts
129.145.71.1 client-1 # Added by DHCP
client-1#
client-1#
client-1# cat /etc/nsswitch.conf
#
# /etc/nsswitch.files:
#
# An example file that could be copied over to /etc/nsswitch.conf; it
# does not use any naming service.
#
# "hosts:" and "services:" in this file are used only if the
# /etc/netconfig file has a "-" for nametoaddr_libs of "inet" transports.

passwd: files
group: files
#hosts: files # Commented out by DHCP
#hosts: files # Added by DHCP # Commented out by DHCP
hosts: files # Added by DHCP dns # Added by DHCP
networks: files
protocols: files
rpc: files
ethers: files
netmasks: files
bootparams: files
publickey: files
# At present there isn't a 'files' backend for netgroup; the system will
# figure it out pretty quickly, and won't use netgroups at all.
netgroup: files
automount: files
aliases: files
services: files
sendmailvars: files
#