05-June-2012 Today, the traditional communication networks are undergoing a big change and are converging into packet based Next Generation Networks (NGN) which run on Internet Protocol (IP). The Internet Protocol is basically a communications protocol used for relaying packets of data across a network. The current version of the Internet Protocol IPv4 is about 27 year old l having many limitations. It is to be replaced by Internet Protocol version 6 (IPv6) to overcome the limitations.