When a packet passes through a packet-filtering firewall, its source and destination address, protocol and destination port number are checked. The packet is dropped -- it's not forwarded to its destination -- if it does not comply with the firewall's rule set. For example, if a firewall is configured with a rule to block Telnet access, then the firewall will drop packets destined for Transmission Control Protocol (TCP) port number 23, the port where a Telnet server application would be listening.
A packet-filtering firewall works mainly on the network layer of the OSI reference model, although the transport layer is used to obtain the source and destination port numbers. It examines each packet independently and does not know whether any given packet is part of an existing stream of traffic.
The packet-filtering firewall is effective, but because it processes each packet in isolation, it can be vulnerable to IP spoofing attacks and has largely been replaced by stateful inspection firewalls.
Read More : firewall management services
A packet-filtering firewall works mainly on the network layer of the OSI reference model, although the transport layer is used to obtain the source and destination port numbers. It examines each packet independently and does not know whether any given packet is part of an existing stream of traffic.
The packet-filtering firewall is effective, but because it processes each packet in isolation, it can be vulnerable to IP spoofing attacks and has largely been replaced by stateful inspection firewalls.
Read More : firewall management services
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