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 How to enable SSH on router Switch on GNS3

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mohammad zeitoun
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mohammad zeitoun

Posts : 55
Join date : 2015-06-27
Age : 37
Location : lebanon

PostSubject: How to enable SSH on router Switch on GNS3   Fri Nov 13, 2015 5:06 pm

Configure SSH communication on L3_Switch.

The topology is simple and our task is to configure SSH on L3_switch, we need the following steps on L3_Switch for accomplish this:

Configure the hostname:


Router#config t

Router#(config)hostname L3_Switch

Telnet does required only the password where as SSH uses both username and password. Therefore we need to create a user for SSH.

L3_Switch#(config) aaa new-model

L3_Switch#(config) username admin secret 5 cisco (“secret” uses the MD5 hash in running config, where 5 Specifies a HIDDEN secret will follow and Cisco is the hidden password)



Configure the DNS domain:

L3_Switch#(config)ip domain name

Enable SSH:

L3_Switch#(config) crypto key generate rsa


How many bits in the modulus [512]:

(If you can want to enable 512 bits encryption then press enter otherwise you can type the other values like 1024 etc.)

L3_Switch#(config)#ip ssh version 2

L3_Switch# (config)#line vty 0 4

L3_Switch# transport input SSH

L3_Switch# (config-line)#login local



You can test SSH configuration from R2 by accessing L3_switch by SSH with following command:


ssh -l admin
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