A Monthly Double-blind Peer Reviewed Refereed Open Access International E-journal -included in the International Serial Directories International Journal of Management, It and Engineering Data Security in the Transition from Ipv4 to Ipv6 ___________________________________________________________ a

IPv4 is a foundation of Internet communication. Designed many years ago the protocol is inadequate in modern networks. New sixth ersion is replacing the older one. It is often repeated that IPv6 was designated to solve some security problems. This statement is true only to some extent. IPv6 deployment for the future infrastructure IPv6DFI (especially in the transition phase) will have large impact, not always positive on many aspects of Internet services: network performance, data security, economy. As number of IPv6 networks grow, new threat awareness and understanding become more important. The paper attempts to present comprehensive survey on IPv6 security and to identify many issues of data security in the transition from IPv4 to IPv6 phase.