How to configure and verify network equipment Telnet

In normal work and maintenance, we often use common remote connection methods such as Telnet or SSL. Today I want to write about the configuration and verification of Telnet.

Telnet is a method of remote device access through IP networks. You need to understand its basic concepts first. It can perform three verification methods: password-free verification, password verification, local username and password verification. Its port is TCP/23 port.

Next we configure Telnet:

The network topology is as shown in the figure below

1. First set the PC The IP address is 192.168.100.1/24, set as shown below

2. Configure the IP address of the port connected to the network on the router

[RT1]int g0/0/0

[RT1-GigabitEthernet0/0/0]ip add 192.168.100.254 24

3. Enable the Telnet server function on the device

[RT1]telnet server enable

% Start Telnet server

4. Enter the vty view and set the authentication method

[RT1]user-interface vty 0 4

[RT1-ui-vty0-4]authentication-mode ?

none Login without checking //No verification required

password Authentication use password of user terminal interface / /Password authentication

scheme Authentication use AAA //Local user authentication

////[RT1-ui-vty0-4]set authentication password simple? (If you use password authentication, go here Set password)

////STRING Plain text password

////[RT1-ui-vty0-4]user privilege level? (If using password verification Set the user login level here)

//// INTEGER Specify privilege level

Note: The user login level range is 0-3 four levels

User level	Allowed command levels
0	Access level
1	Access level, monitoring level
2	Access level, monitoring level, system level
3	Access level, monitoring level, system level, management level

5. Create local users, Configure password, set service type, set user level

[RT1]local-user dgc

New local user added.

[RT1-luser-dgc] password simple 123456

[RT1-luser-dgc]service-type telnet

[RT1-luser-dgc]authorization-attribute level 3

[RT1-luser-dgc ]

6. Verification

Telnet router on the PC, the IP is 192.168.100.254

Being able to enter the RT device indicates that the experiment was successful .

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