Firewalls

Introduction

In this lecture discusses about security methods in the Internet that is Firewall . In brief, It's a configuration of routers and networks placed among an organization's interior internet and a connection to an external internet to afford security. In other words, Firewall is a method to provide limited access to machines both from the outside world to internal internet or from internal world to outside world. Through, providing these security mechanisms, we are rising the processing time before one can access a system. As a result, there is a trade-off among security and simplicity of use. A firewall divide an internet into 2 regions, referred to casually as the inside and outside.

Security Lapses

• Vulnerable Services - NFS : A user should not be allowed to export certain files to the outside world and from the outside world also, someone should not be allowed to export our files.
• Routing based attacks : Some kind of ICMP message should not be allowed to enter my network. e.g.. Source routing and change route ICMP's.

• Controlled access to our systems : e.g.. Mail server and web pages should be accessible from outside but our individual computers should not be accessible from the outside world.

• Authentication : Encryption can be used between hosts on different networks.
• Enhanced Privacy : Some applications should be blocked. e.g.. finger ...
• PING & SYN attack : Since these messages are send very frequently, So you won't be able to do anything except reply to these messages. Therefore, I should not allow these messages to enter my network.

So whatever I provide for my security is called Firewall. It is a method and not just a hardware or software.

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