CLI: Example for Logging In to the CLI Using Telnet (Local Authentication)

By default, Telnet is disabled on the device. You need to establish a Telnet login environment. This section provides an example for configuring how to log in to the CLI using Telnet.

Context

Telnet login is not secure. You are advised to log in to the CLI using STelnet.

Networking Requirements

Figure 1 shows that the FW has a local administrator. The local administrator has some administrator permissions and can use Telnet to log in to the CLI only from a local PC for FW management and maintenance. The FW implements local authentication on administrators.

Figure 1 Networking diagram of logging in to the CLI using Telnet

Data Planning

Item	Data	Description
VTY interface timeout period	5 minutes	The default period is 10 minutes.
Maximum number of authentication attempts allowed	2	The default value is 3.
Lockout period	10 minutes	The default period is 30 minutes.
Administrator account/password	vtyadmin/Mydevice@abc	Note down the user name and password in case you forget them.
IP address of the administrator's PC	10.3.0.100/255.255.255.0	-

Configuration Roadmap

Configurations on the FW are as follows:
1. Enable the Telnet service on the FW.
2. Configure the administrator login interface.
3. Configure the VTY administrator interface.
4. Configure the administrator.
Configure the IP address of the administrator PC and use the Telnet software to log in to the VTY interface.

Procedure

If you log in to the CLI for the first time, reference Logging In to the CLI Through the Console Port and establish the Telnet login environment.
Enable the Telnet service for IPv4 or IPv6. IPv4 is used as an example.
```
<FW> system-view
[FW] telnet server enable
```
Optional: Configure the login interface.

If you use the default settings of management interface to log in to the device, do not perform this step.

Because the default IP address of the management interface has been set to 192.168.0.1, the interface has been added to the Trust zone, and the administrator is allowed to log in to the device using Telnet.
1. Configure the interface IP address and interface-based access control and enable the administrator to log in to the device through Telnet.
```
[FW] interface GigabitEthernet 0/0/3
[FW-GigabitEthernet0/0/3] ip address 10.3.0.1 255.255.255.0
[FW-GigabitEthernet0/0/3] service-manage enable
[FW-GigabitEthernet0/0/3] service-manage telnet permit
[FW-GigabitEthernet0/0/3] quit
```
2. Add an interface to the security zone.
```
[FW] firewall zone trust
[FW-zone-trust] add interface GigabitEthernet0/0/3
[FW-zone-trust] quit
```
Configure the VTY administrator interface.
Set the authentication mode of the VTY administrator interface to AAA and idle disconnection duration to 5 minutes (the default value is 10 minutes).

The number of default VTY administrator interfaces is five. To add more interfaces, run the user-interface maximum-vty number command.
```
[FW] user-interface vty 0 4
[FW-ui-vty0-4] authentication-mode aaa
[FW-ui-vty0-4] protocol inbound telnet
[FW-ui-vty0-4] user privilege level 3
[FW-ui-vty0-4] idle-timeout 5
[FW-ui-vty0-4] quit
```

Configure the Telnet administrator.

Optional: Create an administrator role.

Ignore this step if the default administrator role is used.

[FW] aaa
[FW-aaa] role service-admin
[FW-aaa-role-service-admin] description policy_object_network_readwrite_and_other_modules_none
[FW-aaa-role-service-admin] dashboard none
[FW-aaa-role-service-admin] monitor none
[FW-aaa-role-service-admin] system none
[FW-aaa-role-service-admin] network read-write
[FW-aaa-role-service-admin] object read-write
[FW-aaa-role-service-admin] policy read-write
[FW-aaa-role-service-admin] quit

Create an administrator and bind a role to the administrator.

[FW] aaa
[FW-aaa] manager-user vtyadmin
[FW-aaa-manager-user-vtyadmin] password 
Enter Password: 
Confirm Password:   
[FW-aaa-manager-user-vtyadmin] service-type telnet
[FW-aaa-manager-user-vtyadmin] quit
[FW-aaa] bind manager-user vtyadmin role service-admin

Optional: Configure the automatic lockout function upon a failed login.
By default, an account is locked for 30 minutes after three failed login attempts. In the following example, the account is locked for 10 minutes after two failed login attempts.
```
[FW-aaa] lock-authentication enable
[FW-aaa] lock-authentication failed-count 2
[FW-aaa] lock-authentication timeout 10
```

Configure the local administrator PC as follows:
1. Set the IP address and subnet mask of the administrator PC to 10.3.0.100 and 255.255.255.0.
2. Run the Telnet software on the PC. Windows OS is used as an example. Choose Start > Run. The Run window is displayed. Enter telnet 10.3.0.1 in Open.
3. Click OK and start to connect to the FW.
4. On the login page, enter vtyadmin for Username: and press Enter.
5. Enter Mydevice@abc for Password: and press Enter to log in to the VTY interface.

Configuration Scripts

#                                                                               
 telnet server enable
#
interface GigabitEthernet0/0/3                                                  
 ip address 10.3.0.1 255.255.255.0                                           
 service-manage enable
 service-manage telnet permit                                                    
#
user-interface vty 0 4 
 authentication-mode aaa
 protocol inbound telnet
 user privilege level 3
 idle-timeout 5
#
aaa
 authentication-scheme default
#
 manager-user vtyadmin                                                          
  password cipher %@%@*y:3*ZN}.%%qcL1cCyDwlB.|@XBVMDWq'6JF(iOz2D8>A\SN%@%@           
  service-type telnet                                                             
  level 15                                                                      
#
 lock-authentication enable
 lock-authentication failed-count 2
 lock-authentication timeout 10
#
 bind manager-user vtyadmin role service-admin
role service-admin            
  description policy_object_network_readwrite_and_other_modules_none
 dashboard none
 monitor none
 system none
 network read-write 
 object read-write
 policy read-write
# 
firewall zone trust 
 set priority 85 
 add interface GigabitEthernet0/0/3
#                                                                              
return