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Cisco 831 - locked out

Posted on 2005-03-13
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Last Modified: 2010-05-18
I changed the default gateway from 10.10.10.1 to 192.168.1.1 at which time the router restarted and I now am unable to access the web based admin. I have attempted to access with Telnet though the console port but it cannot connect on port 23...which of course is not enabled. How can I access or restore defaults?
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Question by:riffraff5
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by:-Leo-
ID: 13532666
Telnet through the console port ?
You should connect to the router via console port using serial console cable which is coming together with the router (usually blue cable with RJ-45 jack on one end and DB-9 connector on the second end). Connect RJ-45 end of this cable to the console port on the router and DB9 end to the PC serial port (COM1), the start Hyperterminal (or any serial terminal programm) and you should access your router instantly. You can find pinout for this cable on the Cisco website, in case if you don't have it ... Please let me know if you have more questions.
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by:riffraff5
ID: 13536775
could not find a db9 to rj45 at a local store so i have ordered one. i will let you know later this week how it is going. thanks.
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by:-Leo-
ID: 13541799
Just in case, have a look to this page with Cisco guide to the console cables:
http://www.cisco.com/warp/public/701/14.html


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by:riffraff5
ID: 13579623
Ok.....I have a db9 to rj45 connection and hyperterminal up....a screen comes up asking me to make a new connection. now what?
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-Leo- earned 2000 total points
ID: 13581017
Name your connection first ("cisco" for example), choose your COM port which your cable attached to, then
set your Hyperterminal for the 9600,8,N,1 and press "enter" (these are general settings for Cisco routers, hope they wasn't changed)
You will be prompted for the password (if set for the console)
If you know password - enter it and then to do any changes you should enter enable password, which will bring you to the privileged mode.
If you don't know the password - you have to go through password recovery procedure, which is described here:
http://www.cisco.com/en/US/products/hw/routers/ps380/products_password_recovery09186a00800942c2.shtml

If you know the passwords and can access privileged mode - you can see router programming and change it.

But first of all I will suggest you to read about Cisco router configuration basics, otherwise you can accidently damage your router ...
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by:riffraff5
ID: 13621178
thanks for the help
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