how to secure my network!?

By R_O_L_A_N_D ·
Hi all,

i recently bought a cisco router 2811 and made it my LAN internet Gateway.
everything is working perfectly, i configured secondary ips, did shaping, configured access lists and so on!
but theres one prob thats haunting me!
network security..
the fact remains that anyone which has access to my network (wall sockets) could plug in his laptop and simply acquire a dynamic ip! and hes got full access to yy network!

is there a way that i could configure my router to deny new pcs unless if i allow them to acquire an ip?!

any help would be appreciated :)

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All Answers

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Yes there is, just put in a password.

When the password is put in to your router anyone trying to connect will have to know the password for access to the network. Remember lock down your network from the word go. This is what i do when i get a new router, it is the first thing i do (after i update the routers firmware).

Please post back if you have any more problems or questions.

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by R_O_L_A_N_D In reply to Yes there is, just put in ...

i think you got me all wrong!

its a cisco 2800 series router!
its not an AP! if ur referring to a WEP or WPA key!

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You do not know much about your Cisco router then do you?.

MMMM, do i see "Passwords" in this. :)
Oh by the way, your security is by SDM.
If you do not have the manual go here:

MMMM, i am going for a break. :)

For instructions on configuring your router by using SDM, see the Cisco Router and Security Device Manager (SDM) Quick Start Guide that shipped with your router.

Tip If the messages above do not appear, SDM and the Cisco Router and Security Device Manager (SDM) Quick Start Guide were not shipped with your router. If you want to use SDM, you can download the latest version of SDM and instructions for installing it on your router from the following location:

To obtain the SDM quick start guide, SDM release notes, and other SDM documentation, go to and click the Technical Support and Documentation link.
Initial Configuration Using the Setup Command Facility

This section shows how to use the setup command facility to configure a hostname for the router, set passwords, and configure an interface for communication with the management network. If the following messages appear at the end of the startup sequence, the setup command facility has been invoked automatically:

--- System Configuration Dialog ---

At any point you may enter a question mark '?' for help.

Use ctrl-c to abort configuration dialog at any prompt.

Default settings are in square brackets '[]'.

Would you like to enter the initial configuration dialog? [yes/no]:

The setup command facility prompts you for basic information about your router and network, and it creates an initial configuration file. After the configuration file is created, you can use the CLI or Cisco Router and Security Device Manager (SDM) to perform additional configuration.

The prompts in the setup command facility vary depending on your router model, the installed interface modules, and the software image. The following example and the user entries (in bold) are shown as examples only.

For help with interface and port numbering, see the "Interface Numbering" section.

Please post back if you have any more problems or questions.

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