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Network Security Firewalls
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Re: OSI Packet Filter

from [Martin Mačok] Network Security [Permanent Link]
Subject: Re: OSI Packet Filter
Date: Sat, 27 Nov 2004 14:26:48 +0100 
On Fri, Nov 26, 2004 at 12:09:12AM -0200, Anderson|RootSec-Labs| wrote:


I wanna known, what layer of OSI Model packet filtering Works ?

Network ?? Application ??


It depends on which parts of the packet is the filter looking at.

A bit simplified example: if it is just IP addresses, it's the network
layer. If it is port numbers, it's the transport layer. If it is data
payload, it's the application layer.

Martin Mačok
IT Security Consultant
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