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| Subject: | Re: OSI Packet Filter |
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| Date: | Sun, 28 Nov 2004 04:35:08 +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 ??
I'm not sure if I understood your question completely, but I'll give it a shot. It all depends on what PDU you need to filter in the chain. With MAC addresses, it's in layer 2 (data link); with IP address filtering, it's in layer 3 (network); and when filtering on TCP/UDP port numbers, it's in layer 4 (transport). In cases where you want to inspect the traffic itself (for example for intrusion detection), your traffic might decapsulate all the way to layer 7 (application). .../Bosse -- Bosse Klykken - http://www.klykken.com/~bosse Keep staring. I might do a trick.
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