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Firewall

This document discusses different types of firewalls. It begins by defining a firewall as hardware or software used to help secure a network. It then describes four main types of firewalls: packet filtering, application proxy, stateful inspection, and circuit-level proxy. Packet filtering firewalls apply rules to each IP packet to forward or discard it based on information like source/destination addresses and ports. Application proxy firewalls act as a relay for application-level traffic and can log/audit at this level, providing more security than packet filtering but with more overhead. The document provides brief descriptions and advantages/disadvantages of packet filtering and application proxy firewalls.

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PREPARED BY : PINA CHHATRALA 1 Firewall Submitted By :- Submitted to:- SHANAWAZ Mrs.Afra Fathima Roll No.17MMCA003HY Dept. Of CS& IT
CONTAINTS  What is firewall?  Type of firewall?  Advantage and Disadvantage of firewall?
WHAT IS FIREWALL? A firewall can either be software-based or hardware-based and is used to help keep a network secure . A system designed to prevent network. Firewall can be implement both hardware or software ,or a combination of both.
Milestone  Types of Firewalls . Packet filtering firewall . Application proxy firewall . Stateful inspection firewall . Circuit – level proxy firewall PREPARED BY : PINA CHHATRALA 2
Packet Filtering Fi rewall 4
Packet Filtering Fi rewall  A packet filtering firewall applies a set of rules to each incoming and outgoing IP packet and then forwards or discards the packet.  Filtering rules are based on information contained in a network packet. . Source IP address . Destination IP address . Source and destination transport level address . IP protocol field . Interface 5
Packet Filtering Fi rewall  Two default policies are there to take default action to determine whether to forward or discard the packet. . Default = discard . Default = forward  Some possible attacks on firewall : . IP address spoofing . Source routing attacks . Tiny fragment attacks 6
Packet Filtering Fi rewall  Advantage : . Cost . Low resource usage . Best suited for smaller network  Disadvantage : . Can work only on the network layer . Do not support complex rule based support . Vulnerable to spoofing 7
Application Proxy Fi rewall 8
Application Proxy Firewall  An application – level gateway, also called an application proxy, acts as a rely of application – level traffic.  user requests service from proxy.  proxy validates request as legal.  then actions request and returns result to user.  can log / audit traffic at application level. 9
Application Proxy Fi rewall  Advantage : . More secure than packet filter firewalls . Easy to log and audit incoming traffic  Disadvantage : . Additional processing overhead on each connection
Firewall