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Break Key Combinations For Cisco Password Recovery

Yanurmal — Wed, 15 Oct 2008 07:01:40 +0000

The break key combinations is to login to ROMMON without password authentication. This function is usually to recovery the lost password. You need to access the router phisically and pluged console cable to console port directly.

Software: Hyperterminal
Platform: IBM Compatible
OS: Windows XP
Key: Ctrl-Break

Software: Hyperterminal
Platform: IBM Compatible
OS: Windows 2000
Key: Ctrl-Break

Software: Hyperterminal
Platform: IBM Compatible
OS: Windows 98
Key: Ctrl-Break

Software: SecureCRT
Platform: IBM Compatible
OS: Windows
Key: Ctrl-Break

Software: Minicom
Platform: IBM Compatible
OS: Linux
Key: Ctrl-a f

Software: Dumb Terminal
Platform: IBM
OS:
Key: Break

Software: Z-TERMINAL
Platform: Apple
OS: Mac
Key: Command-b

Change Cisco Password

Yanurmal — Fri, 08 Feb 2008 09:02:19 +0000

Below is command to change cisco password or to add new password. You need user priviledge mode to execute this command.

Router>
Router>enable
Password:
Router#
Router#config terminal
Router(config)#enable secret new_password_here
Router(config)#exit
Router#copy running start
Router#exit

Setup IP Address On An Interface

Yanurmal — Mon, 07 Jan 2008 15:24:53 +0000

After successfull login as priviledge mode, follow this command to assign an IP address to related interface:

Router>enable
Password:
Router#config terminal
Router(config)#

For Fast Ethernet 0

Router(config)#interface Fast 0
Router(config-if)#ip address 192.168.1.1 255.255.255.0

And for Serial 0

Router(config)#interface Serial 0
Router(config-if)#ip address 10.11.12.1 255.255.255.252

Yes, finish. Don’t forget to save your config.
Don’t know how to do it? see below.

Router(config-if)#Ctrl-Z
Router#copy running start

Press enter if your router ask some question
Finish.

Cisco Basic Command

Yanurmal — Mon, 31 Dec 2007 14:37:22 +0000

enable
Enables higher privilege level access, such as privileged EXEC mode.
At this level you can configure your cisco device without restriction.
Prompt will change from > to #

Example:
Router> enable
Password: [type password and enter]
Router#

disable or exit
Log out from privileged EXEC mode and go to user mode.

Example:
Router# exit
Router>

show running config
Display running configuration.

Example:
Router# show running config

show startup config
Display saved config that load every time cisco startup.

Example:
Router# show startup config

enable secret new password
Create new password to access privileged EXEC mode.

Example:
Router# enable secret mysecretword

configure terminal
Change to Global config mode.
In this mode you can configure entire interface.

Example:
Router# configure terminal
Router(config)#

interface interface name and number
Go to interface setup.

Example:
Router(config)# interface fast 0
Router(config-if)#

ip address ip_number musk_number
Assign an ip address to related interface.

Example:
Router(config-if)#ip address 192.168.10.1 255.255.255.0
Router(config-if)#

no shutdown
Activate related interface.

Example:
Router(config-if)#no shutdown
[message of interface change status appear]

ip route remote_network musk_filter ip_wan_interface_remote_router
Create a static routing. This coomand assign at Global config mode.

Router(config-if)#exit
Router(config)# ip route 192.168.100.0 255.255.255.0 10.10.10.2

copy running start
Saved existing configuration to flash memory.

Router(config)#copy run start
[answer yes for the question]

?
Display all related command. Please do some experiment with this command.

Example:
Router>?
or
Router#?
or
Router#show ?
or
Router#configure ?

Console Cable

Yanurmal — Mon, 31 Dec 2007 07:55:40 +0000

Console cable usually shipped with cisco device. This cable pluged to PC serial port (RS232 connector) and Cisco console port (RJ45 connector).

No additional accessories needed, with this cable your cisco console can be access and appear in your PC/Windows Hyper Terminal.

TCP/IP Protocol

Yanurmal — Sun, 30 Dec 2007 05:13:46 +0000

Before configure your cisco device, you have to understand well TCP/IP protocol.
This is must and never touch your cisco device without concept of Network ID, Host ID and Network Musk in your brain.

Below is links to some website that can help you to understand the TCP/IP concept. Please go there and never comeback here except you get tcp/ip concept in you brain

1. Tcpipguide
2. Wikipedia
3. YaleEdu

Setup Windows Hyper Terminal to Access Cisco Console

Yanurmal — Sun, 30 Dec 2007 02:42:59 +0000

From WindowsXP:
Click Start – All Programs – Accessories – Communications – Hyper Terminal
If it does not appear on the list of accessory programs, then go to Add Remove Progran in Control Panle to install Hyper Terminal.

Once Hyper Terminal window open, type in a name for connection name (example: Cisco) then click OK.

Under “Connect using” select “Com1″ if you use Com1 otherwise select the appropriate com port, then click OK.

Next,
Set “Bits per second” to 9600
Set “Data Bits” to 8
Set “Parity” to None
Set “Stop Bits” to 1
Set “Flow control” to Hardware

Then click OK and Hyper Terminal screen should appear.

Note: Sometimes cisco console not apear in your hyper terminal screen, try to push enter twice.

You need a console cable to access your cisco console, click here.