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Cisco is bar far the market leading in manufacturing and supply of networking equipment.  This includes routers, bridges, frame switches and ATM switches, dial-up access servers and network management software.  Some of Cisco's products have become the de facto standards.  Hopefully the information contained in here will help you work your way around some of there products and provide you with a list and how-to's for using a number of freeware tools that are available out there for Vulnerability Analysis and Penetration Testing.


Hacking Cisco Networks Exposed is a great book, providing a wealth of information.  A number of tools are listed inside including:



Another tool that can be used is p0f.


Hopefully the following précis of command syntax can help you navigate your way around any Cisco routers and switches you come across.


Cisco Router Configuration Commands:


Set a console password to cisco

Router(config)#line con 0
Router(config-line)#password cisco

Set the telnet password to cisco

Router(config)#line vty 0 4
Router(config-line)#password cisco

Stop console timing out

Router(config)#line con 0
Router(config-line)#exec-timeout 0 0

Set the enable password to [ANOTHER].

Router(config)#enable password [ANOTHER]

Set the enable secret password to [ANOTHER].

This will override the enable password and will be stored encypted within the config file

Router(config)#enable secret [ANOTHER]

Enable an interface

Router(config-if)#no shutdown

To disable an interface


To add an IP address to a interface

Router(config-if)#ip addr

To enable RIP on all 192.168.x.y interfaces

Router(config)#router rip

Disable RIP

Router(config)#no router rip

To enable IRGP with a AS of 200, to all interfaces

Router(config)#router igrp 200

Disable IGRP

Router(config)#no router igrp 200

Static route the remote network is, with a mask of, the next hop is, at a cost of 3 hops

Router(config)#ip route 3

Disable CDP for the whole router

Router(config)#no cdp run

Enable CDP for he whole router

Router(config)#cdp run

Disable CDP on an interface

Router(config-if)#no cdp enable


Cisco Router Show Commands                                                                                        

View version information

show version

View current configuration (DRAM)

show running-config

View startup configuration (NVRAM)

show startup-config

Show IOS file and flash space

show flash

Shows all logs that the router has in its memory

show log

View the interface status of interface e0

show interface e0

Overview all interfaces on the router

show ip interfaces brief

Display current routing protocols

show ip protocols

Display IP routing table

show ip route

Display access lists

show access-lists

Cisco Router Basic Operations                                                                                                       


Enter privileged mode

Return to user mode from privileged


Exit Router

Logout or exit or quit

Recall last command

up arrow or <Ctrl-P>

Recall next command

down arrow or <Ctrl-N>

Suspend or abort

<Shift> and  <Ctrl> and 6 then x

Refresh screen output


Complete Command



Cisco Router Show Commands

Save the current configuration from DRAM to NVRAM

copy running-config startup-config

Merge NVRAM configuration to DRAM

copy startup-config running-config

Copy DRAM configuration to a TFTP server

copy runing-config tftp

Merge TFTP configuration with current router configuration held in DRAM

copy tftp runing-config

Backup the IOS onto a TFTP server

copy flash tftp

Upgrade the router IOS from a TFTP server

copy tftp flash




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