The main functionality of a router is to route packets from one place to another. Linux machine can be used as router on your network that will route substantial amount of traffic without any issues, if configured correctly.

Due to the increasing amount of malicious and attack traffic on the internet, it has become very much necessary to take some extra care while configuring routes on a Linux machine or physical router's.

One of the major problem that internet security people are dealing with today, is spoofing. 

What is IP address spoofing?

IP spoofing is a method adopted by attacker's to send forged source address in their attack traffic.Which means they can send an IP packet with an IP address of their wish.

whenever security in communication is discussed, three things that come to mind is authentication,integrity, and data encryption. Although encryption and authentication are the major topics that needs to be taken care of, integrity of the data transferred also needs a major attention.

What problems are addressed with the help of integrity check?. Imagine that you are communicating with your friend through a chat client. How will your friend's machine know that the message he received is exactly the same message that you send?. And how will he verify that the message was not altered in the middle.

Even after implementing a secure authentication and data encryption, integrity of the message needs to be versified, to confirm, that the data was not tampered in the middle.

Due to the elaborate explanation required to comprehend SSL protocol, we have divided this SSL tutorial, into multiple parts.

Read: Record Protocol in SSL

Read:Working of Secure Socket Layer

In this post, we will understand "SSL Handshake Protocol".

SSL protocol, does its fantastic job of securing communication over the wire, with the help of multiple layers of protocols, above TCP(And After Application Layer).

SSL Protocols

SSL protocol, which was initially developed by Netscape, is the base for secure communication in the internet today. SSL Being a big topic to cover in a single article/blog post, we have tried to segregate different topics to be understood in SSL.

In this post, we will try to understand the Record Protocol in SSL, out of the four main layers in SSL, which are mentioned below.

Due to the increase in widespread use of internet website's for online bank transactions, and exchange of sensitive information, over the wire, several efforts were made to secure the communication.

The result of such efforts are evident from different communication protocol's that exists today. We will be discussing two such protocol's in this post.

All layers of TCP/IP has got its own security threats and vulnerabilities. We will be discussing security threats and vulnerabilities in each and every layer in TCP/IP separately in different posts as each one requires special attention.

In this post we will discuss vulnerabilities that pose security threats at the second layer of TCP/IP. So our topic of interest for this post is Data Link Layer. Although data link layer comes below most of the other layers, a security breach in this layer can cause service disruptions to upper layers.

Some protocol's of Data link Layer:

SSH is the best method available out there for the job of establishing connection with remote server's in a secure manner. System administrators use ssh, too ofter to carry out their administration tasks. SSH was truly a revolutionary protocol to take shell remotely and carry out operations very securely.

However there are some shortcomings in the protocol, due the overhead, as well as design limitations. Some of them are listed below.