Specifications

Chapter 6. Managing the Router 151
trigger alarms on thresholds, graph or list node statistic counters, view and edit individual MIB variables, and
print reports.
An example of useful information that can be obtained from a remote SNMP client would be the current status of
the routerÕs WAN link and Ethernet interfaces, including protocol (PPP, CSMA-CD), line speed, maximum frame
(transmission unit) size, physical address, operating status, or packet traffic rates.
Telnet Remote Access
The router supports Telnet access. Telnet allows you to log in to the router as if you are directly connected
through the console port. You can issue commands, using the command line interface, to configure the router and
perform status monitoring from any remote location.
To access the router using Telnet, use one of the available TCP/IP packages containing the Telnet application.
Issue the appropriate command syntax and assign the IP address of the router. You are then directly connected to
the router and can issue commands. (For an example, see Telnet Session for Remote Access, on page 14.) To end
the Telnet session, exit the application by entering logoff or another appropriate command.
By default, a system security timer logs out a Telnet session after 10 minutes of inactivity. To change the timer
period, use the system securitytimer command, page 226.
To disable and re-enable Telnet access, use the command system telnetport, page 227. For more information on
controlling Telnet access to the router, see page 101.
Client TFTP Facility
A client Trivial File Transfer Protocol (TFTP) facility is built into the router that is capable of reading from and
writing to the network. A TFTP server must be properly configured to communicate with the router for file
transfers to be successful. The client TFTP facility can be used to boot software from a TFTP server, perform
software upgrades and copy configuration files to a TFTP server. A TFTP server is integrated into the WindowsÕ
Configuration Manager and can also be used as a stand-alone application.
TFTP Server
The TFTPD (Trivial File Transfer Protocol Daemon) program is installed on your PC as part of the DSL Tools
software. TFTPD waits for incoming TFTP requests from TFTP clients. It can put a file on your computerÕs hard
disk or get one from it.
Because there is no security built into TFTPD, it is important to specify a root directory where all accessible files
are located. When a file is requested, it must be at or below the level of this root directory on your directory tree or
the request is denied. If a TFTP client attempts to put a file on your PC, the file must already exist for writing.
The Options menu of the TFTPD program allows the user to configure additional parameters, such as the number
of retries and the time between retries. The root directory can also be specified from the Options menu.
The DOS command line usage for TFTPD is: