Password Recovery for routers

Lab Report

Password Recovery for routers

Let's use the Cisco Packet Tracer simulator to emulate the password of the reset router! Let's first set up the Enable password for this router! Open the router's configuration interface! The command is as follows:

router>enable //into privileged mode router#configure terminal  //into global mode router (config) #hostname  r-a //the command named to the router
r-a (config) #enable   password 123456789 //command to set password

If we forget to enter the privileged mode password, then we will shut down the router and restart! Then press the "Ctrl+break" key to interrupt the router's boot process and enter Rommon mode!

The input command changes the configuration register value to 0x2142, which causes the router to not read the configuration file in NVRAM when it is turned on. Then restart the router!

The command is as follows:

Rommon 1 > Confreg 0x2142 //Change the configuration register value to 0x2142
Rommon 3 > Reset//Restart router

When the router restarts, it will go directly to the  setup  configuration mode, with "CTRL + C" or "n"  ,
exit  setup mode! Then we go into the global mode and reset the privileged mode password! If there are other password samples are forgotten, here we can reset together!

The command is as follows:
Router>enable//Enter privileged mode
Router#configure Terminal//Enter global mode
Router (config) #enable password 1234//Reset Password command

Now return the value of the register to normal 0x2102! Then save the router configuration that has changed! Reboot our router and you're done!

The command is as follows:

Router (config) #config-register 0x2102//Register value returned to normal 0x2102
Router (config) #exit//exit Global mode

router#copy running-config startup-config //save changes to router configuration
destination filename  [STARTUP-CONFIG]?&NBSP,
building configuration ...
[ok]
router#reload //restarting the router

This article from "FQR" blog, declined reprint!

Password Recovery for routers