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Raspberry Pi as a LAN firewall server

I have a simple WiFi router configuration and I intend to filter out some websites and limit caps to others, in other words I need to have some rules my router can't simply provide. I plan to use a Raspberry Pi computer aided with a USB NIC as an intermediate way between the DSL modem and the router. 1. What software could I use to create such rules? 2. is using a USB NIC adding any extra costs here [network performance cost]? Thank you.

Electronics CCNA Embedded Systems Network Systems
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Question added by Badr Ghatasheh , Software Engineer , bayt.com
Date Posted: 2013/04/16
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Ayman Shorman
by Ayman Shorman , Devops Manager , Smart Charging Technologies

Hello Badr, Why you don't use Dynamic DNS http://www.opendns.com instead of the intermediate device ? it's saving your cost in performance and money then manage your traffic over the website after you put their DNS in your router.
The USB NIC is very bad in performance and it's compounded if you have multiple USB devices beyond your USB NIC.
Regards

Balamurali cheviri
by Balamurali cheviri , System Administrator , Gulf and Safa

A firewall is a set of related programs, located at a network gateway server, that protects the resources of a private network from users from other networks.
(The term also implies the security policy that is used with the programs.) An enterprise with an intranet that allows its workers access to the wider Internet installs a firewall to prevent outsiders from accessing its own private data resources and for controlling what outside resources its own users have access to.

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