![]() ![]() We have already talked about the ACL in the “ How does it work? ” section of this article.Ĭircuit-level Gateways work at the 5th layer or Session layer of the OSI model or more specifically TCP layer of the TCP/IP. Depending on the packet and the criteria, the firewall can drop a packet or forward it, or send a message to the originator. In a packet filtering firewall, each packet is compared to a set of criteria before it is forwarded. Packet filtering firewalls work at the Network layer of the OSI model.
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