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Unformatted text preview: 1 Packet Filters Packet Filters CNIT 34000 Lecture 10 Packet Filters A software solution that limits network connectivity based on packet characteristics source/destination/packet type Can control both ingress and egress traffic Fits into the network stack between the TCP/IP stack and the Application The packet filter determines whether the packet is allowed to be passed to an application Between layers 5 and 6 in the OSI model Between layers 3 and 4 in the TCP/IP model All modern operating systems include some sort of packet filter Firewalls A firewall is a router that contains a packet filter Routers segment networks and process each packet A dedicated software/hardware solution Should offer minimal (preferably no) other network services Software running on general purpose computers m u n u wall/pfsense/etc. Dedicated hardware/software solution Cisco PIX/ASA, Juniper NetScreen, etc....
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This note was uploaded on 05/07/2010 for the course CNIT 340 taught by Professor Rawles during the Fall '09 term at Purdue University-West Lafayette.
- Fall '09