The networking research community is working to design the Next Generation Internet, which will meet the needs of the twenty-first century. The first requirement for the Next Generation Internet is security. Furthermore, the Internet will include heterogeneous environment, such as cellular and sensor networks. In this talk, I will present our research work related to above mentioned problems and focusing on a new security oriented Internet architecture and security solutions for heterogeneous environments. It should allow receivers to set policies for how and where they receive their information. The Next Generation Internet should be designed for mobile objects. Naming, addressing architecture, and routing have to be such that these objects can move and decide how and where they want to receive their Internet traffic with full rights of privacy of their location, if desired. In this talk, I will present our research work related to above mentioned problems and focusing on Internet architecture, mobile, wireless and security issues.