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Password Recovery of Cisco Router 2600

Friday, August 19, 2016



Having problem to login in router or forgotten password? This lab will tell you resetting the password modern Cisco routers from 2600 Series and later.

Now if you are not accessing you exac password you need to break it. Bellow given process can give you detailed idea to break password.

Step 1

Switch on router and wait till boot process will start. When boot process will start we need to break that booting sequence by pressing CTRL and PAUSE BREAK. This will lead you towards Rommon Mode.

System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)
Copyright (c) 2003 by cisco Systems, Inc.
C2600 platform with 262144 Kbytes of main memory

monitor: command "boot" aborted due to user interrupt
rommon 1 >

Step2

Routers have configuration register values which are 0x2102 which is default configuration register value and second is 0x2142 which also can be changed in Rommon mode.  In Rommon mode we need to change this value to reset password and for that commands are given bellow.

rommon 1 >confreg 0x2142
rommon 2 >reset
This reset command will reload router and will take you to the user interface mode with latest configuration register value.

Step 3

 Now when you are logged in to the router you need to do all the settings and configurations again what you have done previously or have to set passwords again.

--- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]: n


Press RETURN to get started!

Router>enable
Router#copy start run
Destination filename [running-config]?
506 bytes copied in 3.868 secs (168 bytes/sec)
Cbitss#configure terminal
Cbitss(config)#enable secret NEWENABLEPASSWORD
Cbitss(config)#line con 0
Cbitss(config-if)#password NEWPASSWORD
Cbitss(config-if)#end
Cbitss#copy run start
Destination filename [startup-config]?
Building configuration...
[OK]
Cbitss#

Alternative

Erase NV RAM so that it will remove all previous settings and configurations from Cisco router. After erasing it again you need to set default configuration register value again.

--- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]: n


Press RETURN to get started!

Router>enable
Router#write erase
Erasing the nvram filesystem will remove all files! Continue? [confirm]
[OK]
Erase of nvram: complete

Router#configure terminal
Router(config)#config-register 0x2102
Router(config)#end

Now your router is accessible again.
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