Lab 3.1.4: Configuring PPP interactive mode and assign a peer default address

Objectives:

  • Allow users to run either EXEC or PPP depending on their preference.

Scenario:

The CTO of the Atlanta Bread Company has just called you. She is asking why can't she start an EXEC session on the core router through a dialup connection. She would also like to dialin for free Internet access. You will configure the core router to permit PPP and EXEC sessions.

Notes: 

Lab Tasks:

  1. Log into the Atlanta router and enter global configuration mode.
  2. Configure the serial interface for both EXEC and PPP async operation. The commands to configure the serial interface are :

Atlanta(config)#interface serial 0/1
Atlanta(config-if)#no async mode dedicated
Atlanta(config-if)#async mode interactive
Atlanta(config-if)#peer default ip address 10.1.1.2

Below is a brief description of each of the above commands.

No async mode dedicated  Removes the PPP only feature
Async mode interactive  Allows both EXEC and PPP
Peer default IP address  Automatically assigns an IP address to a host
  1. The next step is to configure the router to begin a PPP session if the remote node begins sending PPP frames. The command to do this is:

    Atlanta(config)#line 2
    Atlanta(config-line)#autoselect ppp

  2. Write the configuration to memory.
  3. From the Macon router issue the following command:

Macon#ping 172.16.0.1

Record your findings below:

  1. Once the modems connect, issue the command 'Show Dialer" and record your results below:

  1. Leave the router alone for five minutes and see if the async connection drops
  2. From Macon, Reverse telnet to the modem on line 2 and manually dial the modem to the Atlanta core router. To do this issue the follow commands:

Macon#telnet modem2
Enter the Cisco Password
Type"ATDT555600X" (X represents the port number on the Atlas 550)

Once the routers connect press the "Enter" key. Did the Atlanta core router display the following prompt?

CONNECT 33600 V42bis

User Access Verification

Password:

  1. After completing step 8, configure a workstation to dial the Atlanta Router using dialup networking. Do not use a username and use "cisco" as the password. After the connection is made, issue the "winipcfg" command in Windows. What IP address were you assigned?

Save your configurations for use in the next lab.

Congratulations! You now have a PPP dialin connection from the Macon office to the Atlanta office, a PPP server for the CTO, and out-of-band management of the Atlanta core router.