Also Vulnerable to Spoofing in some Cases. Packet Filtering Firewalls can work only on the Network Layer and these Firewalls do not support Complex rule based models.The Biggest Advantage of Packet Filtering Firewalls is Cost and Lower Resource Usage.Administrators can create their ACLs on the basis Address, Protocols and Packet attributes. If in case, any packet does not meet the criteria then that packet is dropped and Logs are updated about this information. They check all the Packets and screen them against the rules defined by the Network Administrator as per the ACLs. Packet Filtering Firewalls work on the Basis of Rules defines by Access Control Lists.Packet Filtering Firewalls can only be Implemented on the Network Layer of OSI Model. Packet Filtering Firewalls are normally Deployed on the Routers which connect the Internal Network to Internet.Stateful Multilayer Inspection Firewalls.Firewalls generally only Screen the Packet Headers.Firewall can filter contents on the basis of Address, Protocols, Packet attributes and State.A Network Administrator can define what is important for him and configure the Firewall to make the Logs accordingly. Firewalls generally also maintain a log of Important Activities in Inside the Network.Only, If the Data Packets are allowed as per ACL, they will be Transmitted over the Connection.
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