User guide

Internetworking Primer A-55
Asynchronous Protocols
ARA Authentication
You can use the line configuration command autoselect arap to launch ARA protocol
automatically. The person logging into an access server that is using the ARA protocol, is
authenticated against either the username and password database in the configuration of the
access server, or against a TACACS server. To store the ARA protocol username database
on a TACACS server may require that the tacacs server be enabled with the supplementary
file. The following line command and the tacacs commands are entered to enable the
supplementary file:
arap use-tacacs (single-line)
ARA and Error Correction
The ARA protocol negotiates MNP4 error correction between the two ARA devices
(remote ARA client and Cisco IOS). MNP4 requires special support considerations for
ARA v1.0 clients. Turning off MNP4 support on the access server modem can eliminate
this problem. Refer to the publication ARA Setup and Troubleshooting which is available
on CIO for additional information.
Configuration Example
The following is an example of asynchronous protocol configuration. In this example, the
access server is configured to allow dial-in clients to launch ARA, SLIP, and PPP on line 1.
All the connected modems are U.S. Robotics V.34 Courier modems.
hostname cs
!
appletalk routing
ipx routing
arap network 100 ARA Dialin
!
username Meredith password 7 ASD@#$ASD
chat-script usrv34 at&f1&D2SO=1
!
interface ethernet 0
ip address 172.16.1.10 255.255.255.0
ipx network B010
appletalk cable-range 1001-1002
appletalk zone Marketing
appletalk zone Sales