You have encountered some problems when installing a PPP WAN link with your ISP.

Question

You have encountered some problems when installing a PPP WAN link with your ISP. On your router, you check the output of the command “show interface s0/0/0”. It says “Serial 0/0/0 is up, line protocol is down”. Based on this information, you would check these two things:

1 The encapsulation used on the serial port.

2 The IP address used on the serial port.

3 The netmask used on the serial port.

4 The username and CHAP password in the router’s configuration.

5 The WAN cabling connected to the serial port.

Explanation / Answer

1. Check if both interfaces have a unique IP address in the same subnet. eg. 192.32.22.0 / 192.32.22.12

2.  verify if the encapsulation type is set for the same type on the serial port

3. Cable Problem (loose cabling , cable not seated fully , wrong cable compatibility issues ).

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