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Number of posts : 570 Age : 39 Location : Hyderabad Registration date : 2008-04-13
| Subject: Telnet Tutorial Fri 25 Apr 2008, 12:24 am | |
| Telnet Operation
My tutorial is provided as a supplement to the Gateway Installation Manual and is designed to provide information on how to communicate with the Gateway's Telnet Server. The Telnet Server provides a command and control path for operation with the Gateway. The interaction between the Gateway and a customer-supplied Telnet Client for many of the common Telnet functions are documented below. The complete list of Telnet commands is available here. The Telnet Functions described in this document are: Ping Establishing a Telnet Connection Common Usage Commands Change IP Addresses Load New/modified Configuration Load New Application Log Telnet Sessions Enlarge Telnet Window
Ping Ping is an IP Command that is used to determine if a device is active. Verify your device is connected to the LAN. Type PING, the Gateway's IP Address and press the Enter key. For example: "Ping 192.0.0.120" If the Gateway is active, the Gateway will return echo replies back from network server verifying that the Gateway's destination IP address is reachable. Typically, if you can ping the Gateway, you can open a Telnet session with the Gateway. You may also Telnet to the Gateway and, from the command line type PING and an IP address on your network to determine if the Gateway is able to communicate with the specified device.
Establishing a Telnet Connection Telnet is an IP function that allows communication with another device for command and control. The remote device must run a Telnet Server and you must run a Telnet Client. Telnet commands are not case sensitive and can be entered in upper or lowercase. Start your Telnet Client Establish a Telnet connection to the the Telnet Server by entering the command: Telnet 192.10.10.120 2000
In this example, 192.10.10.120 is the IP Address and 2000 is the port number. You may be prompted for a Telnet Login Name and Password. Enter the Telnet Name and Password defined in the configuration program. If these fields were not defined, enter any characher in each field to begin the session with the Telnet Server.
Common Usage Commands HELP will return this list. RESET resets the Gateway and its buffers, also disconnects any active socket connections. LOGOUT ends the current telnet session with the window, but does not kill any active socket connections. SHOW returns the send and receive statuses of all interfaces, any tasks that may be running, and IP addresses/application version that is currently loaded onto the gateway. CHANGE allows the user to issue commands to modify the configuration from the command line interface.
Change IP Addresses Issuing the change command before any IP address will change the IP addresses that the application is reading, but does not modify any IP addresses that were originally entered in the configuration program. Note: Any changes that were made in the telnet session with the Gateway must be mirrored in the configuration program, if a configuration is to be re-transferred with the changes that were made in the last Telnet session.
Load New/modified Configuration Type Change conf load enabled. This sets the flag for loading a new configuration. Type Show to verify that the flag has been changed to "enabled". Type Reset command. Once the Gateway receives the reset command, the connection will be terminated. Your Telnet Client will display the message "Connection to Host Lost". You must log back into the Gateway. Startup TFTP Server or Async Server program, the old configuration will be overwritten with the re-transferred configuration. Re-open a Telnet session with Gateway. If configuration is successfully reloaded, the conf load flag will report "disabled". Note: User must re-enter the configuration program to re-transfer a new/modified configuration (JBMGW50.CFG).
Load New Application Type change boot app load enabled. This sets the flag for loading a new application. Type show to verify that the flag has been changed to "enabled". If using a TFTP server, type change boot tftp ip 192.0.0.120 (example). Startup the TFTP Server or Async Server program, the old application can be overwritten with a new or upgraded application. Type the reset command. Once the Gateway receives the reset command, the connection will be terminated. Your Telnet Client will display the message "Connection to Host Lost". You must log back into the Gateway. Re-open a Telnet session with Gateway (You may have to wait 40-60 seconds while the new application is being written to memory). If application is successfully reloaded, the boot app load flag will report "disabled". Type show app. Verify that the name of the new application is reported. Note: User must copy/overwrite the old application with a new/upgraded application (JBMGW50.BIN).
Log Telnet Sessions Terminal -Start Logging will open telnet.log. User can rename file for uniqueness. Move this file to a text editor to view or print. Preferences-Stop Logging will end the current logging session.
Enlarge Telnet Window Terminal-Preferences-increase buffer size from 25 to 100.
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