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Terminal Service of Telnet Connection 65
The interface listen port number is within the range of 1025 to 65535. Please note
that the listen port number cannot be the same as that of the widely used ports.
By default, the port number and asynchronous interface have the following
relations:
■ The async serial interface number starts from 2001. For instance, the first async
serial interface number is 2001, the second is 2002, and so on.
■ The AUX interface number is 3000.
■ The sync serial interface number starts from 3001. For instance, the first sync
serial interface number is 3001, the second is 3002, and so on.
Force shut down Telnet Process
In some cases (such as usage of Telnet by a malicious user), the administrator user
logging from the Console port can use the
kill telnet command to disconnect
the link from the Telnet user to the router or disconnect the link according to the
process number found through the
display client command. Use caution
when executing this command.
Please perform the following configuration in system view.
Table 48 Force to shut down Telnet process
Display and Debug
Reverse Telnet
Connection
Perform the following configuration in all views.
Table 49 Establish Telnet Server or Telnet Client connection
display client can only be used to display the interface through which the
Telnet client connected to the router passes. If you want to view the IP address of
the Telnet server connected to the router, you should execute the
display tcp
status
command. The TCP connection whose local port number is 23 is the Telnet
connection, including the Telnet client connection and Telnet server connection.
Typical Configuration
Example of Telnet and
Reverse Telne
t
Example of Telnet
In the networking diagram shown in Figure 28 “Telnet server service”, the host
establishes connection with router A (IP address 10.110.0.1), then logs on and
configures router B (IP address 129.102.0.1).
1 Execute the following commands on the user host and Telnet to Router A.
C:\WINDOWS>Telnet 10.110.0.1
2 Execute the following commands in the popup Telnet window, and log onto
Router B.
[RouterA]telnet 129.102.0.1
Trying 129.102.0.1 ...(use CTRL + C to break)
Connected to 129.102.0.1
Service port is 23 .
Username:guest
Operation Command
Force to shut down Telnet process kill telnet { all | userID userid }
Operation Command
Display information of Telnet clients display client
Display information of Telnet connection display tcp status