Analyze and recover a classic instance of a route switch device password

At present, the demand for Routing Switching equipment is very high in the market, especially in enterprises. It can be seen from the data that the performance of Routing Switching equipment is also gradually improving. The vro and vswitch password recovery methods must be mastered by the network administrator. These contents are displayed in the CCNA courses. However, from the description of this user, we can see that the model of the routing switch device used by your company is not CISCO, so there are different methods to crack the password, the registration key value does not need to be modified for cracking passwords of Huawei 3COM products. Other operations are similar to Cisco Route exchange devices.

Password Restoration:

Generally, the password corresponding to a specific service is a primary password. For example, the remote telnet password of a route exchange device belongs to this category. Because the vrotelnet console Authentication and remote telnet AUTHENTICATION are separated, even if telnet logon requires authentication, we can still try to directly connect to the console using the console line, if you do not need a password, we are very lucky that the password for these basic services can be easily modified. After entering the management interface, run the local-user command to change the password of the corresponding account to restore the password. In fact, this is true for many Routing Switching devices. telnet and console control logon passwords are set separately, so you can connect to the vrotelnet Management console through the console even if the telnet logon password is forgotten.

Recovery of advanced passwords:

If the console verification password, including the primary password, is also forgotten or lost, it will be a little more troublesome to recover.

Step 1: power off the MSR router and restart the MSR router when the CONSOLE line is connected normally. Pay attention to the information displayed in the terminal connection. When press CTRL + B to enter extended boot menu appears, press CTRL and B to enter the extended boot option.

Step 2: There are multiple options available in the extended startup options for us to choose from. In turn, start the system in the CF card, go to the serial port sub-menu, go to the Ethernet sub-menu, and choose file control, modify the bootrom password, ignore the startup of the system config file, clear the super password, perform operations on the routing switch device, and restart. If the Console logon is based on password verification, select "Clear super password. If you find that the logon to the Console is based on both the user name and password, you should select the sixth item-ignore system configuration (ignore system configuration ).

Step 3: After the selection is complete, the system returns to the menu just now. It seems that there is no difference on the surface, but it has actually been completed. Next, we only need to select 9 -- reboot to restart the MSR router. During the next startup, the router will not load any information in the previously saved config file.

Step 4: restart the MSR router without any operation or re-entering ctrl + B to enter the extended startup option. When "Configuration file is skipped. User interface con0 is available." appears during vro startup, it indicates that the config file has not been loaded, and the User still has the console control permission. In this case, we can execute dis cur to view the configuration and use local-user to modify the account information and correct the password, so as to achieve password recovery.

After entering this management interface that does not load any configuration, we can "do whatever we want". You can modify the Console Administrator Account information or password, at the same time, you can also modify the corresponding telnet and other services. In short, you have the highest permissions and can perform password restoration at will.

Conclusion-no matter which level of password is forgotten, as long as we have a Console line, we can use the Console interface and the CTRL + B Start Menu to restore accounts or passwords at all levels. This method is applicable to Cisco and Huawei 3COM products, and other companies have similar solutions.