Breaking cisco 2600 series password

Breaking cisco 2600 series password

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swith off the device and swith on
after 2 or 3 seconds press the CTRL+PauseBreak
!you will enter in the rom monitor mode which is the safe mode.
There is an entery by name of configuration register.
if the configuration register is 0x2102(default), it means to load the configuration file from the nvram when booting. we have to change the configuration register to 0x2142 which means to by pass the configurtion file from nvram.

rommon> confreg 0x2142
rommon> reset

when router boots,
Router#
copy startup-config running-config
!we copy the configuration file from nvram to running-config
change the passwords and configuration register number
you are done

conf t
enable password cisco
line con 0
password cisco
login
exit
line vty 0 4
password cisco
login

configuration-register 0x2102
exit
copy run star

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breaking 2500 series password
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swith off the device and swith on
after 2 or 3 seconds press the CTRL+PauseBreak
!you will enter in the rom monitor mode which is the safe mode.
There is an entery by name of configuration register.
if the configuration register is 0x2102(default), it means to load the configuration file from the nvram when booting. we have to change the configuration register to 0x2142 which means to by pass the configurtion file from nvram.
> o/r 0x2142
>init

copy startup-config running-config
!we copy the configuration file from nvram to running-config
change the passwords and configuration register number
you are done

conf t
enable password cisco
line con 0
password cisco
login
exit
line vty 0 4
password cisco
login

configuration-register 0x2102
exit
copy run star