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| Subject: | Re: OSI Packet Filter |
|---|---|
| Date: | Sat, 27 Nov 2004 11:39:27 +0100 |
Le vendredi 26 novembre 2004 à 00:09 -0200, Anderson|RootSec-Labs| a écrit :
I wanna known, what layer of OSI Model packet filtering Works ?
My 0,02€.
Afaik, they work at :
. network, typically IP
. transport, typically TCP, UDP, ICMP
. session, when dealing with stuff like FTP, H323, etc.
Encapsulations are dealt reinjection encapsulated data in the correct
layer. So can filter regarding some layer 2 (link) informations such as
source MAC address (see Netfilter). Some have layer 2 filtering (MAC src
and dst, layer 3 proto, etc.), especially when operating in bridged
mode, but that's frame filtering, more than packet filtering.
Some firewalls are providing "application filtering", but it is still
correct to call this "packet filtering" ? I don't think so.
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