Backtrack 5 is dedicated operating system for penetration testing. This is perfect for forensic. Download ISO from here.
In the subject of information security, backtrack is essential. It has a number of built-in tools and exploits that are beneficial for maintaining computer security. It’s a good place to start for newcomers. I’ve posted Backtrack in GNOME format. Backtrack is available on the market in a KDE version as well. In essence, Backtrack is built on Ubuntu. Ubuntu comes with a ton of software loaded to help with information security specialists.It includes many packs, packet sniffing tools, and network testing tools.