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The wide use of the Internet-based applications bring many challenges to the researchers to guarantee the continuity of the connections needed by the mobile hosts and provide reliable Internet access for them. One of proposed solutions by Internet Engineering Task Force (IETF) is to connect the local, multi-hop, and infrastructure-less Mobile Ad hoc Network (MANET) with Internet structure. This connection is done through multi-interface devices known as Internet Gateways. Many issues are related to this connection like gateway discovery, handoff, address auto-configuration and selecting the optimum gateway when multiple gateways exist. Many studies were done proposing gateway selection schemes with a single selection criterion or weighted multiple criteria. In this research, a review of some of these schemes is done showing the differences, the features, the challenges and the drawbacks of each of them., {"references":["H. Ammari, and H. El-Rewini, \"Integration of mobile ad hoc networks and the internet using mobile gateways,\" in Proc. IEEE International Parallel and Distributed Processing Symposium (IPDPS'04), USA, 2004, p. 218b.","J. Broch, D. Maltz, and D. Johnson, \"Supporting hierarchy and heterogeneous interfaces in multi-hop wireless ad hoc networks,\" in Proc. IEEE Workshop on Mobile Computing (I-SPAN), Perth, 1999.","A. Triviño-Cabrera, G. Casado-Hernández, E. Casilari, and F. González-Cañete, \"Study of gateway selection criteria in hybrid MANETs,\" in Proc. 6th Conf. Telecommunications, Peniche, 2007.","Y. Yan, L. Ci, Z. Wang, and W. He, \"QoS-based gateway selection in MANET with Internet connectivity,\" 15th Int. Conf. Advanced Communication Technology (ICACT), 2013, pp.195-199.","H. Luo, X. Meng, R. Ramjee, P. Sinha, and L. Li, \"The design and evaluation of unified cellular and ad-hoc networks,\" IEEE Trans. Mobile Computing, vol. 6, pp. 1060-1074, 2007.","D. Cavalcanti, C. Cordeiro, A. Kumar, and D. Agrawal, \"Self-adaptive routing protocols for integrating cellular networks, WLANs, and MANETs,\" Wireless and Mobile Computing Journal, vol.7, pp. 375-397, 2007.","W. Ma,and J. Liu, \"A gateway selection scheme for internetworking of MANET and internet using improved genetic algorithm,\" in Proc. Int. Conf. Wireless Communications, Networking and Mobile Computing, USA, 2009, pp. 2668-2671.","R. Kumar, M. Misra, and A. Sarje, \"A proactive load-aware gateway discovery in ad hoc networks for Internet connectivity,\" International Journal of Computer Networks & Communications (IJCNC), vol. 2, no.5, pp. 120-139, 2010.","K. Khan, A. Reddy, and P. Zaman, \"An effective gateway discovery mechanism in an Integrated Internet-MANET (IIM),\" in Proc. Int. Conf. Advances in Computer Engineering, India, 2010, pp. 24-28.\n[10]\tB. Park, W. Lee, C. Lee, and C. Shin, \"QoS-aware adaptive internet gateway selection in ad hoc wireless internet access networks,\" in Proc. 3rd Int. Conf. Broadband Communications, Networks and Systems. 2006.\n[11]\tX. Zhanyang, H. Xiaoxuan, and Z. Shunyi, \"A scheme of multipath gateway discovery and selection for MANET using Multi-Metric,\" 1st Int. Conf. Information Science and Engineering (ICISE), 2009.\n[12]\tR. Hemalatha, D. Yamuna, M. Devi, S. Aishwarya, and J. V. Ananthi, \"Improving Qos Performance in the Gateway Node,\" International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, vol. 2, no. 2, pp. 834-841. 2013.\n[13]\tT. Sheltami, \"Gateway selection review in ad hoc networks,\"Journal of computers, vol. 1, no. 2, 2006.\n[14]\tR. Manoharan, S. Rajarajan, S. Sashtinathan, and K. Sriram, \"A novel multi-hop b3g architecture for adaptive gateway management in heterogeneous wireless networks,\" in Proc. 5th IEEE WiMob, 2009, pp. 48-54.\n[15]\tS. Kumar, J. Prakash, R. Kumar, and Y. Singh, \"An efficient gateway discovery and selection approach based on Quality of Service attributes,\" International Journal of Engineering Science and Technology (IJEST), vol. 5, no.6, 2013.\n[16]\tQ. Le-Trung, E. Engelstad, T. Skeie, and A. Taherkordi, \"Load-balance of Intra/Inter-MANET traffic over multiple Internet gateways,\" in Proc. Int. Conf. Advances in Mobile Computing and Multimedia, Austria, 2008, pp. 50-57.\n[17]\tS. Iqbal, and M. Kabir, \"Hybrid scheme for discovering and selecting Internet gateway in mobile ad hoc network,\" International Journal of Wireless and Mobile Networks (IJWMN), vol. 3, no. 4, pp. 83-101. 2011."]}