In this paper, some of the security flaws of IPv6 are identified and the authors present a new architecture for TCP/IP protocol suite. The authors' proposed architecture includes a layer called security layer, which guarantees security to application layer using a protocol Application Layer Security Protocol (ALSP). The Internet has instantly evolved into a vast global network in the growing technology. TCP/IP protocol suite is the basic requirement for today's Internet. Internet usage continues to increase exponentially. So network security becomes a growing problem. Even though IPv6 comes with build mechanism IP sec for security, it lacks security in application layer of TCP/IP protocol suite.