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Firewall (iptables) Rules

Posted on 2003-03-22
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Last Modified: 2013-11-16
I've installed one linux pc and one windows 98 at home. The linux box serves as a gateway to the Internet connection. Currently, I'm trying to mess around with the ip filtering (iptables) stuffs on the linux box.  my question is:
Does the ip filtering rules have any effect on the speed of the internet connection (particularly web surfing)? It seems that the web pages are loaded faster without any ip filtering rules than with ip filtering rules, is this true? Anyone can provide some sample rules for the web surfing (for INPUT,OUTPUT,and FORWARD chain)?
thank you.
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Question by:viansoo
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romeo_ earned 75 total points
ID: 8189455
Hi,

Here you can find a tutorial. It's a complete one.

http://iptables-tutorial.frozentux.net/iptables-tutorial.html

About your question regarding the speed... I'm not sure but I think about two things:
1. if you discard some brodcast messages from an early stage in the kernel, things could get better
2. you have to think twice when you make your roules (see the tutorial) - it's good to not let the packets travel to all your chains if it is not necessary to do that
3. if you do filtering it's logic to slow a little bit the traffic ...

Regards,
Romeo.
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