3Com Router User Manual
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4 TERMINAL SERVICE This chapter includes information on the following topics: ■Terminal Service Overview ■Terminal Message Service ■Dumb Terminal Service ■Terminal Service of Telnet Connection ■Rlogin Terminal Service ■X.25 PAD Remote Access Service Terminal Service OverviewThe terminal services provided by the 3Com Router to access the command line interface are as follows: ■Perform terminal configuration via Console port ■Perform terminal configuration via asynchronous serial port ■Perform terminal...
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58CHAPTER 4: TERMINAL SERVICE Features of Terminal Service at Async Serial PortThe 3Com Router supports remote configuration on the router via asynchronous serial port (including synchronous/asynchronous serial port, 8/16 asynchronous serial port, and AUX port). Please refer to Chapter 2 “3Com Router User Interface”of this manual for the specific method to establish the configuration environment. The remote terminal service features of the asynchronous serial port are shown in the following...
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Terminal Message Service59 with user B, user A should telnet onto Router B and execute the send command to send the related information in all views. Then user B can receive the “message” sent from user A. If user B does not want to receive additional similar messages, they can use the send switch command to disable the function of receiving messages. Configure Terminal Message ServiceTerminal message service configuration includes: ■Send message to terminals ■Enable/disable receiving messages from...
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60CHAPTER 4: TERMINAL SERVICE Typical Example of Terminal Message Service Configuration# Input the send command in system view. [Router] send Enter message, end with CTRL/Z; abort with CTRL/C: # Input the contents of the message that the terminal will send. hello world # (Enter to terminate the message input ) end message? [confirm] Press Enter, Ctrl+W, y, or Y to confirm the sending. Press Ctrl+C or other characters to give up the sending. Dumb Terminal Service When the asynchronous serial port...
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Dumb Terminal Service61 By default, no dumb terminal service is configured. 2Configure auto-execute command command If the auto-execute command command is configured on the asynchronous serial interface, when you press Enter twice on the external terminal connected to the interface or log onto the router in modem dial-up mode and press Enter twice, the router will automatically execute the operation preset by the auto-execute command command. If the router is configured with the auto-execute...
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62CHAPTER 4: TERMINAL SERVICE Figure 27 Dumb terminal networking diagram 1Configure the interface to dumb terminal mode. [Router-Serial1] physical-mode async [Router-Serial1] undo modem [Router-Serial1] async mode flow 2Configure the auto-execute command command. [Router-Serial1] auto-execute command telnet 10.110.164.45 After the configuration, press Enter twice on the terminal connected to this async interface to log on the SCO UNIX host 1.110.164.45. During the configuration, you can click exit...
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Terminal Service of Telnet Connection63 Figure 29 Telnet client service Reverse Telnet OverviewReverse Telnet service: the user logs on the router with a specified port number by running the Telnet client program on the PC. Then the connection to the serial port device connected with the async port of the router is established. One example: the 3Com Router performs remote configuration and maintenance of the external devices connected with its 8/16 asynchronous port with Reverse Telnet service....
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64CHAPTER 4: TERMINAL SERVICE Ta b l e 46 Establish Telnet Server or Telnet Client connection By default, Telnet Server starts automatically. The default value of service-port is 23. To terminate Telnet service, enter Ctrl+] at Telnet Client side. Setup Reverse Telnet Connection Please use async mode flow and undo modem commands in asynchronous interface view, use telnet and terminal telnet refuse-negotiation commands in system view, use reverse-telnet disconnect, reverse-telnet timeout ,...
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Terminal Service of Telnet Connection65 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...
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66CHAPTER 4: TERMINAL SERVICE Password: User guest logged in . 3The message showing successful Telnet to Router B should pop up and display the host name of RouterB. [RouterB] Example of Reverse Telnet The host is connected to the router, then communicates with the device connected to the seventh asynchronous serial interface of the router. The IP address of the router is 10.110.164.44. [Router] telnet 10.110.164.44 2007 Trying 10.110.164.44... Service port is 2007 (tty) Connected to 10.110.164.44...