Network Firewall System

Abstract

Packet is a unit of data that is routed between an origin and destination on any packet - switched network. When a file is sent over the network the tcp layer of tcp/ip protocol divides it into chunks for efficient routing. A packet sniffer program monitors the network traffic by grabbing information traveling over a network, thereby saving the transmitted files. The application captures every packet on the wire to display important information such as a list of packets and network connections and other vital statistics. Packet capturing is required when we need to see what client and server are actually saying to each other or when we need to analyze the type of traffic on network. It is also required for the understanding of network protocols to be used effectively. These functionalities are further utilized for the purposes of packet filtering by the Firewall application. The captured packets are checked as per the ruleset defined within the Firewall application. The rule-set differentiates the packets to be allowed to enter into the LAN and the ones which are to be blocked from entering into the LAN. Therefore, the security of the personal network is managed by this application and it decides upon whether the incoming and outgoing packets are malicious or not and thereby permits and deny the packets accordingly.