Configure PIX interface by DHCP
Contributed by qmchenry 
Tagged: Cisco firewall In many situations such as remote sites connected by DSL or cable modem, the outside interface IP address of a firewall must support dynamic addressing by DHCP.
To configure the outside interface to obtain its settings by DHCP:
nameif ethernet0 outside security0
ip address outside dhcp setroute
The firewall will immediately try to receive an IP address and settings by DHCP.
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