Appendix A: Networking Examples; Dialup Lan-To-Lan; Using Names And Passwords - Black Box LRA001A-R2 User Manual

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 U N
SING AMES AND
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
Async Router AR-5
Async Router AR-P
Async Router AR-P
Async Router AR-P
ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER USER'S MANUAL
P
ASSWORDS
Name
paris
hamburg
london
northridge
Link Password
all2paris
ham2paris
lon2paris
nor2paris
password file entries
name/password
hamburg/ham2paris
london/lon2paris
northridge/nor2paris
paris/all2paris
paris/all2paris
paris/all2paris
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