Packet Filtering using IP Tables in Linux
Firewalls are core elements in network security. However,
managing firewall rules, especially for enterprise networks, has
become complex and error-prone. Firewall filtering rules have to
be carefully written and organized in order to correctly
implement the security policy. In addition, inserting or modifying
a filtering rule requires thorough analysis of the relationship
between the rules in order to determine the proper order.
In this paper work has been done on creating the virtual network
environment using Microsoft virtual PC(SP1) and Capturing and
analyzing of network packets using the most popular open source
network protocol analyzer Wireshark and on the basis of
analyzing the packet work has been done on writing the script to
block/allow the network traffic using IPtables and after blocking
traffic further capturing and analyzing of packets using
Wireshark.
Keywords: Firewall, Wireshark, IPtables,Linux, HTTP
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