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TFTP Security Features

The router provides some security measures to control access to and

use of the TFTP facility. Initial TFTP connection requests are made on

the well-known User Datagram Protocol (UDP) port 69. Access to TFTP

on a specific network interface can be blocked, therefore, by

constructing a TCP/UDP port filter to drop incoming datagrams destined

for port 69.

In addition, TFTP does not auto-enable in the default state. While you

can configure the TFTP Auto Enable parameter to be “Yes”, this option

may not be desirous in environments where security is a concern. Use

the following procedure to transfer objects (operating code,

configurations, or NCL displays) to or from a system on which TFTP is

not auto-enabled.

1. Telnet to the system.

2. Log in.

3. Access the “Network Control Language Interpreter” from the Main

menu.

4. Use NCL’s Enable command to enable TFTP (en tftp on this

router).

5. Do the transfer using the Fget or Fput command (or other TFTP

command on the remote system).

6. Disable TFTP after completing the transfer (dis tftp on this

router).

NCL

Commands

Using the Network Control Language

Using TFTP To Transfer Operating Code, Configuration, and NCL Display

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