When would you need this: When your ISP gives you dynamic IP address upon each connection or you need to configure the router to obtain its interface IP address automatically.

Special Requirements: None.

This is done using a single command,

Router(config-if)#ip address dhcp

Some service providers might ask you to use a client-id and/or a hostname of their own choice. This can be done by adding the following parameters to the command above,

Router(config-if)#ip address dhcp client-id INTNAME hostname HOST

where,

INTNAME is the interface name that will be used for the client-id

HOST is the hostname that will be used for the DHCP binding. This hostname can be different from the one that was set for the router in the global configuration.

You can use both of these parameters, one of them, or none of them.

If you need to use the 'ip nat outside' command at the interface and setup the rest of the NAT configuration as mentioned in the NAT and PAT Configureation Procedure.

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