Basic Serial Line Configuration

If you don’t want to change the default HDLC encapsulation, then, in order to set up your WAN connection, you need only to do the following:

1. Add an IP address to your interface
2. Bring the interface up (with the no shut command)
3. Ensure there is a clock rate on the DCE side

Here is the configuration if you have the DCE cable attached:

Router#config t
Router(config)#interface Serial0
Router(config-if)#ip address 192.168.1.1 255.255.255.0
Router(config-if)#clock rate . . .

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