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:
Use your configurations from Lab 3.1.4. Log into the Atlanta
router and enter global configuration mode.
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
Write the configuration to memory.
From the Macon router issue the following command:
Macon#ping 172.16.0.1
Record your findings below:
Once the modems connect, issue the command 'Show
Dialer" and record
your results below:
Leave the router alone for five minutes and see if the async
connection drops
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:
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.
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.