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Cisco 2800 Router configuration


I have netgear modem i want to connet Cisco Router 2811 for natting. So what are the commands to configure the router. I got all the details for ADSl connection which provided by the ISP. i need step by step commands so that i can configure the router for natting purpose.

I want to bring another 2 computers on the network through the cisco 2811 router.


  • Other Network Infrastructure Subjects

Re: Cisco 2800 Router configuration

i think you want to use Natting for converting your private adress space to public ip address so that users are able to access internet.

Here is a sample configuration

ip nat pool Internet prefix-length

ip nat inside source list 100 pool Internet overload

Access-list 100 permit ip any

Interface fa 0/0 ---assuming inside interface

ip nat inside

interface fa 0/1 ----assuming connnnecting to ISP

Ip nat outside

You can modify your access-list for specific policies while defining the interseting traffic

More config examples on this link



New Member

Re: Cisco 2800 Router configuration

Hi narayan

Thanks for the quick responce. Basically i want to bring three or more PC on the net.

Here is the connectivity details.

1. Netgear Modem

2. Cisco 2811 Router connected to Netgear Modem via crossover cable FE 0/0.

3. From the router FE 0/1 its connected to catalyst 3560.


ISP has not provided any static IP. Means i am not using static IP. They have provided username and password. Can you please tell me where should i do the authentication to connect to internet.

Can you please suggest how do i bring router and PCs on net.


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