Cisco router password

170 pts.
Tags:
Cisco 1841
Cisco Routers
I have 1841 cisco router and I forgot the password, so how i can reconfig the password agin

Software/Hardware used:
software

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Power off the router.

Get yourself a copy of TeraTerm (it is old, but good)
Connect your PC serial port to the CON port on the router and run TeraTerm, configured for the serial port, at 9600, 8 bits, no parity.

Press return a few times, and make sure you can see the output from the router.

Power off the router.
Power it back on again, and when you see something, send a ‘BREAK’ by pressing Alt+B
The router shoud return a boot> prompt.
Type

<b>config-reg 0×2142</b>

Then type

<b>boot</b>

Let the router load, and it will come up with the prompts asking if you want to use the configuration utility.
Say <b>NO</b> to this.

Type the following when it gets to the > prompt

<b>en
copy start run</b>
{press return to the prompts from this command}

When it has finished

<b>show run</b>

Check and see if it has an ‘enable password’ command or an ‘enable secret’

<b>conf t
config-reg 0×2102
enable secret {whatever you want as a password}
no enable password</b> (if it has one of these)
<b>end
wr</b>

And the password is changed.

You should reboot to make the config register change, and also to confirm the password has changed correctly.

I did all this from memory, so if it doesn’t work, then post here and I will double check, or someone will point out my stupid mistake ;-)

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  • Sonotsky
    Looks about right, BlankReg. And I second the use of Tera Term - it's on my list of must-have admin utilities. And it's free! For those readers who haven't experienced the joy of TT, go get it!
    695 pointsBadges:
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  • Kevin Beaver
    Worst case, you can use Cisco Auditing Tool (CAT) that's part of the BackTrack suite and try to crack the password.
    17,140 pointsBadges:
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