Try the following command " dhcpd auto_config outside"
ASA-1(config)# dhcpd auto_config ?
configure mode commands/options:
Available client interfaces from which to obtain WINS/DNS/domain information:
inside Name of interface Vlan2
internet Name of interface Vlan3
outside Name of interface Vlan1
ASA-1(config)# dhcpd auto_config outside
Here is a link:
http://www.cisco.com/en/US/partner/docs/security/asa/asa83/command/reference/d2.html#wp1994252
