Packet Crafting (Paperback)

High Quality Content by WIKIPEDIA articles! Packet crafting is a technique that allows to probe firewall rule-sets and find entry points into the targeted system or network.This can be done with a packet generator.A firewall is a part of a computer system or network that is designed to block unauthorized access while permitting authorized communications. It is a device or set of devices which is configured to permit or deny computer applications based upon a set of rules and other criteria. Firewalls can be implemented in either hardware or software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets.