3com 3031 Instruccion De Instalación

This chapter covers the following topics:

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A router is not configured with a user password when it is powered on for the first 
time. In that condition, any user can perform configuration on the router as long 
as connecting his PC with the router via a Console port. The remote user can also 
access the router via Telnet if the router has been configured with IP address of 
Main Processing Unit (MPU) or the interface board, and it is possible for the 
remote user to access the network by establishing PPP connection with the router. 
To ensure the network security, it is necessary to configure a user and user 
password for the router to facilitate the management of the user.

This chapter focuses on the authentication management over terminal users and 
Telnet users. Refer to Part IX “Security” for a description of other user types and 
AAA RADIUS authentication.

According to the service for a user, the user of a router can be classified into the 
following types:

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HyperTerminal user, accessing the router via a Console port or AUX port;

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Telnet user, accessing the router via Telnet command;

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FTP user, establishing FTP connection with the router to transmit packets;

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PPP user, establishing PPP connections (such as dialing and PPPoA) with the 
router to access the network.

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SSH user, establishing SSH connection with the router to access the network;

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PAD user, establishing PAD connection with the router to access the network.

A user can have several services at the same time. In this way, only one user can 
execute multiple functions.

The system provides hierarchical management to the HyperTerminal user and 
Telnet user. Similar to the priority of commands, the user priority is divided into 
Visit, Monitor, Config and Manage, with the priority identifier from 0 to 3. The 
priority of the user determines which priority of commands he can access. In the 
case of non-authentication or password authentication, it is the priority of the user