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ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER USER’S MANUAL
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Appendix A: Networking Examples
This appendix describes two typical Router installations:
• dialup LAN-to-LAN,
• synchronous LAN-to-LAN.
A.1 Dialup LAN-to-LAN
A.1.1 USING NAMES AND PASSWORDS
To provide basic security for your network, each Router is configured with a name, a root password and a
link password. The Router name and link password are required when connecting to or from a remote
router. The root password is additionally required to establish a telnet or ftp session (TCP/IP only) to
the Router, or to establish a RouterVu session (IPX only) to the Router, or when logging in on the system
console.
For security on the WAN interface, the Router can use either the Password Authentication Protocol
(PAP) or Challenge Handshake Authentication Protocol (CHAP). The Router is configured to enable
CHAP by default. The CHAP and PAP “handshake” requires a name and link password pair from each
router. For example, when router A connects with router B, router A must present router A’s name and
link password to router B. Conversely, when router B connects with router A, router B must present
router B’s name and link password to router A. The name and link password for both ends of the link
are maintained in the password file on the Router diskette. If the PAP or CHAP handshake does not
complete successfully, the two devices are not allowed to communicate.
Name and password security is further illustrated by the following example. Consider the network
connections made by Routers with the following system names, link passwords, and password file entries:
Table A-1. Connection Example: Async Router AR-5 to Async Router AR-Ps.
System Name Link Password password file entries
name/password
Async Router AR-5 paris all2paris hamburg/ham2paris
london/lon2paris
northridge/nor2paris
Async Router AR-P hamburg ham2paris paris/all2paris
Async Router AR-P london lon2paris paris/all2paris
Async Router AR-P northridge nor2paris paris/all2paris