Basic configuration of Telnet and SSH

Telnet:

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Primary TCP services such as telnet:

R1 Configuration:

Router>enable

Router#configure Terminal

Router (config) #line console 0// Configure line console Port

Router (config-line) #exec-timeout 0 0// set timeout to never time out

Router (config-line) #logging synchronous// turn on log synchronization information

Router (Config-line) #exit

Router (config) #no IP do lo// turn off domain name resolution

Router (config) #ho Router0// Set the name of the router

Router0 (config) #interface f0/0

Router0 (config-if) #ip address 12.1.1.1 255.255.255.0

Router0 (config-if) #no shutdown

Router0 (CONFIG-IF) #exit// Configure IP address under interface

R2 Configuration:

Router (config) #line console 0

Router (config-line) #exec-timeout 0 0

Router (config-line) #logging synchronous

Router (Config-line) #exit

Router (config) #no IP do lo

Router (config) #ho Router2

Router2 (config) #interface f0/0

Router2 (config-if) #ip address 12.1.1.2 255.255.255.0

Router2 (config-if) #no shutdown

Router2 (config-if) #exit

Router2 (config) #username 123 password 123// set user name and password

Router2 (config) #line vty 0 4// Set the interface of the landing line

Router2 (config-line) #password 123// set line password

Router2 (config-line) #exit

Router2 (config) #enable password 123// Enter password for privileged user

Router2 (config) #end

Router0#telnet 12.1.1.2// telnet login

Trying 12.1.1.2 ... Open

User Access Verification

Password:

SSH:

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R1 Configuration:

Router>enable

Router#configure Terminal

Router (config) #line console 0// Configure line console Port

Router (config-line) #exec-timeout 0 0// set timeout to never time out

Router (config-line) #logging synchronous// turn on log synchronization information

Router (Config-line) #exit

Router (config) #no IP do lo// turn off domain name resolution

Router (config) #ho Router0// Set the name of the router

Router0 (config) #interface f0/0

Router0 (config-if) #ip address 12.1.1.1 255.255.255.0

Router0 (config-if) #no shutdown

Router0 (CONFIG-IF) #exit// Configure IP address under interface

R1 (config) #username 123 password Cisco // Set user name password information for login use

R1 (config) #ip domain-name www.123.com // set domain name

R1 (config) #crypto key generate RSA

The name for the keys would be:r1.www.123.com

Choose the size of the key modulus in the range of 2048 for your

General Purpose Keys. Choosing a key modulus greater than

A few minutes.

How many bits in the modulus [512]:1024

% generating-bit RSA keys, keys would be non-exportable ... [OK]

R1 (config) #line vty 0 4

R1 (config-line) #transport input ssh // open ssh service feature

R1 (config-line) #login Local

R1 (Config-line) #exit

R2 Configuration:

Router (config) #line console 0

Router (config-line) #exec-timeout 0 0

Router (config-line) #logging synchronous

Router (Config-line) #exit

Router (config) #no IP do lo

Router (config) #ho Router2

Router2 (config) #interface f0/0

Router2 (config-if) #ip address 12.1.1.2 255.255.255.0

Router2 (config-if) #no shutdown

Router2 (config-if) #exit

r2#ssh-l 123 12.1.1.1 //ssh Login

Password:

R1>

Basic configuration of Telnet and SSH