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How to Telnet a Cisco Router – CCNA Lab

 

Telnet a cisco router

Telnet is a virtual terminal protocol which is used to remotely access network devices for remote management or information gathering. Upon Successfully establishing telnet connection to a device make us able to run any available programs on the remote device.

In order to access remote device (in our case remote router) through telnet, first you have to configure a password for VTY lines on the remote router, this is done initially through console cable and console connection.

Once the switches and routers in the network are configured for telnet access through console connection, we can then use telnet to reconfigure, manage or monitor each router and switch remotely without connecting physically through console cable.

We can run Telnet program from any DOS command prompt or Cisco device, for DOS command prompt click on start in windows and type cmd, click on cmd and wait for it to open. In command prompt type telnet IPAddress , Replace the IP Address with the real IP Address of the device you want to access.

Telnet a Cisco Router:

We will use the routers setup which were used in the previous lab for cisco discovery protocol(CDP).

Open the command line interface (CLI) of Upaae1 router and follow the steps below.

Upaae1>
Upaae1>
Upaae1>enable
Upaae1#telnet 12.1.1.2
Trying 12.1.1.2 ...Open
 
[Connection to 12.1.1.2 closed by foreign host]
Upaae1#
Upaae1#

VTY lines not configured

We cannot access Upaae2 router through Telnet because VTY lines on a router are configured as login which means we have to either set password for VTY lines or enforce no login through no login command on Upaae2 router. We will configure VTY password on Upaae2 router by using console cable and Hyperterminal.

Open CLI of Upaae2 and execute the following commands.

Upaae2>enable
Upaae2#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Upaae2(config)#
Upaae2(config)#line vty 0 4
Upaae2(config-line)#
Upaae2(config-line)#password upaae2pass
Upaae2(config-line)#login
Upaae2(config-line)#end
Upaae2#
%SYS-5-CONFIG_I: Configured from console by console
 
Upaae2#

configure vty password on router upaae2

Now it is time to telnet Upaae2 router.

Upaae1#
Upaae1#telnet 12.1.1.2
Trying 12.1.1.2 ...Open
 
User Access Verification
Password:
Upaae2>

Telnet Upaae2 router success

We have remote access to Upaae2, lets run a few commands on Upaae2 but before that we must configure enable password on router Upaae2 through console connection. You may want to read this article on setting enable password and setting enable secret password on cisco devices.

Upaae2>enable
Upaae2#
Upaae2#
Upaae2#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Upaae2(config)#
Upaae2(config)#
Upaae2(config)#enable password upaae2enpass
Upaae2(config)#exit

Complete Remote Access Upaae2 from Upaae1 router:

Upaae1>enable
Upaae1#telnet 12.1.1.2
Trying 12.1.1.2 ...Open
 
User Access Verification
Password:
Upaae2>
Upaae2>
Upaae2>enable
Password:
Upaae2# // press (ctrl+shift+6), release (ctrl+shift+6), then (press X key).
Upaae2#
Upaae1#show sessions

Conn   Host                Address                       Byte    Idle     Conn Name

* 1     12.1.1.2           12.1.1.2                      0           0         12.1.1.2

This output indicates that your session to host 12.1.12 (router Upaae2) is opened.

Type exit anytime if you want to end the telnet connection, if you want to keep telnet connection to the remote device and still come back to your original router console, press [ctrl+shift+6], release [ctrl+shift+6] then press X key.

 

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