Packet filtering also cannot be used for content-based filtering and cannot, for instance, remove e-mail attachments. Packet filtering works well for small networks but when applied to larger networks can quickly become very complex and difficult to configure.Packet filtering can also often be performed by other network devices such as routers and is generally what you get when you download free firewall software. Generally they enable you to have some control through the use of access lists. This basic form of firewall protection is really no more than a simple sorting algorithm. Packet filtering or network layer (Layer 3) firewalls make decisions based on the source and destination addresses and ports in IP packets.
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