Tuesday, May 29, 2012

The Basics Of Internet Protocol (IP) Address System

An Internet Protocol (IP) Address is an important aspect of not only the World Wide Web (WWW)/Internet but is also required for conducting a successful Cyber Forensics Analysis. So it is important to have a basic knowledge about IP Address. In this Article I would try to cover the most significant aspects of IP Address and a detailed and technical analysis is beyond the scope of this Article.

Every Computer that communicates on the Internet is allotted a unique IP Address. Through this unique IP Address the “Identity” of the Individual may be established. However, there are exceptions to this case. For instance using of a Proxy Server may not reveal the true IP Address of the Individual. Similarly, IP Address Spoofing may not provide the correct details of the Computer that has been used to send the communication. 

There are two Standards for IP addresses i.e. IP Version 4 (IPv4) and IP Version 6 (IPv6). Presently, most Computers are using IPv4 but soon the same would be migrated to IPv6 as IPv4 is no more able to cope up with the growing demands of IP Addresses.

An IP Address can be either Static or Dynamic. Generally, a Static IP Address is one that your Administrator/ISPs allots and configures by editing your Computer's Network Settings. It produces a single and constant identifiable IP Address that can be easily attributable to the Computer using the same.

A Dynamic IP Address is assigned by the Dynamic Host Configuration Protocol (DHCP), a service running on the Network. DHCP typically runs on Network Hardware such as Routers or dedicated DHCP Servers. A Computer using Dynamic IP Address is allotted a new IP Address for each “New Session” during its “Lease Period”.

A single IP Address may further be shared by different Computers using a “Router”. If you use a Router to share an Internet connection, the Router gets the IP Address issued directly from the ISP. Then, it creates and manages a Subnet for all the Computers connected to that Router. The Router would get the External IP Address and the Computers connected to the Router would get Internal IP Addresses to further “Identify” each Individual Computer.

The most common locations for finding IP Addresses are Log Files, in the Received Header fields of an E-Mail, Tcpdump Traces, etc. In some circumstances only a Host Name must have been recorded, but this can simply be translated into an IP Address.

IP Addresses are the “First Step” in the Cyber Forensics Investigations. However, IP Tracking must be done with great caution and with good application of mind. A casual IP tracking exercise may not only provide wrong results but can also implicate an innocent person.  I would cover these issues in more detail in my subsequent articles.

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