User guide

268 Chapter 6. Managing the Router
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. You can use one of the available TCP/IP packages
containing the Telnet application. To access the router using Telnet, 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. When
you wish to end the Telnet session, exit the application by entering logoff or another appropriate command.
A system security timer will log a user off a Telnet session after 10 minutes of inactivity. For more information,
refer to the system securitytimer command.
Use the command system telnetport to enable or disable Telnet access.
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 is employed 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 will put a file on your computerÕs hard
disk or get one from it.
There is no security built into TFTPD, therefore it is important to specify a root directory where all the files that
can be accessed 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 will be denied. If a TFTP client wants to put a file on your PC, then 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:
TFTPD rootdirectory
The TFTPD operational parameters are kept in the file ROUTER.INI in the form:
rootdir=rootdirectory
retries=maxtries
timeout=timeout
TFTPD is automatically called by BOOTP and Configuration Manager.