Lab 3.1.6: Configuring PPP interactive mode and allow a dynamic address assignment

Objectives:

  • Allow dialin users to select their own ip addresses.

Scenario:

The Atlanta Bread Company has a customer that would like to utilize the dialin core router to receive E-mail. The host will specify its own address. You will configure the core router to permit the UNIX host to specify the IP address.

Notes: 

Lab Tasks:

  1. Use your configurations from Lab 3.1.4. Log into the Atlanta router and enter global configuration mode.
  2. Configure the serial interface for dynamic assignment of asynchronous addresses. The command to configure the serial interface is:

    Atlanta(config)#interface serial 0/1
    Atlanta(config-if)#async dynamic address

  3. Write the configuration to memory.
  4. 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:




  2. Leave the router alone for five minutes and see if the async connection drops
  3. Reverse Telnet to the modem on line 2 and manually dial the modem to the Atlanta core router. To do this issue the follow command:

Macon#telnet modem2

User Access Verification
Password cisco

Type "ATDT555600X"

Did the Atlanta core router display the following prompt after the modems connected?

CONNECT 33600 V42bis

User Access Verification

Password:

  1. Login to the router with the cisco password and issue the following command:

Atlanta>ppp

Did the router ask you for what IP address you request?

What is the significance of the IP address?

After you type in what IP address you request you will see the PPP frames being displayed on your screen. Press Control,Shift,6 and then X to escape out of the reverse telnet.

  1. After completing step 8, configure a workstation to dial the Atlanta Router using dialup networking. Configure the dialup connection to pop up a terminal window at login. To do this, right click on the dialup connection and choose properties. Click on the "Configure" button under the modem type. Under options, check the box "Bring up terminal window after dialing." Do not use a username and use "cisco" as the password. Once you establish an exec session with the router, issue the following command:

Atlanta>ppp

After the connection is made, issue the "winipcfg" command in Windows. What IP address were you assigned?

Congratulations! Users may now specify what IP address they want during a dialin session.