3Com 10014299 Setup Reverse Telnet Connection, Enable Reverse Telnet connection, Service-port

64CHAPTER 4: TERMINAL SERVICE

Table 46 Establish Telnet Server or Telnet Client connection

Operation	Command
Enable the Telnet Client connection service	telnet host-ip-address [
	service-port ]

By default, Telnet Server starts automatically. The default value of service-portis 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-negotiationcommands in system view, use reverse-telnet disconnect, reverse-telnet timeout, reverse-telnet listenport and reverse-telnetreturn-dealcommands in interface view.

Table 47 Enable Reverse Telnet connection

Operation	Command
Forbid the modem to dial in or dial out	undo modem
Set the router to flow mode	async mode flow
Log onto the router at specified port and	telnet host-ip-address
connect to corresponding async port	service-port
Disable/Enable the option negotiation towards	terminal telnet
the Telnet client	refuse-negotiation
Configure the timeout of Reverse Telnet	terminal telnet timeout
Configure the Reverse Telnet timeout of the	reverse-telnet timeout time
interface
Disconnect the Reverse Telnet of the interface	reverse-telnet disconnect
Do not send the carriage return received from	reverse-telnet return-deal
the telnet end to the terminal	from-telnet
Do not send the carriage return received from	reverse-telnet return-deal
the terminal to the telnet end	from-dumb

By default, the option for negotiation towards the Telnet client is enabled, and Reverse Telnet will expire in 600 seconds. Reverse Telnet transparently transmits all data. The interface use the default listen port number.

Reverse Telnet timeout ensures that if no data is transmitted during a specified time, the established Reverse Telnet will disconnect automatically. By default, no timeout is configured for the Reverse Telnet, that is, as long as the Reverse Telnet is connected, even if there is no data being transmitted, the Reverse Telnet will not be disconnected.

The Reverse Telnet can be disconnected in interface view.

The undo modem command must be used to disable modem calling-in and calling-out before the Reverse Telnet timeout of the configuration interface is configured.

On the 3Com Router series, the maximum number of Reverse Telnet connections is related to the interface card and the maximum number of tasks supported by the router.