Abstract  Internet-based  Mobile  Ad  Hoc  Networking  (MANET)  is  an  emerging  technology  that  supports  self-organizing  mobile  networking  infrastructures.  This  is  expected   to  be  of  great  use  in  commercial  applications  for  the  next  generation  internet  users.  A  number  of  technical  challenges  ar e  faced  today  due  to  the  heterogeneous,  dynamic  nat ure  of  this  hybrid  MANET.  A  new  hybrid  routing  scheme  AODV  ALMA  is  pro posed,  which  act  simultaneously  combining  mobile  agents  to  find  path  to  the  gateway  and  on-demand  distance  vector  a pproach  to  find  path  in  local  MANET  is  one  of  the  unique  solution.  An  adaptive  gateway  discovery  mechanism  based  on  mobil e  agents  making  use  of  pheromone  value,  pheromone  decay  time  and  balance index is used to estimate the path and next  hop to the gateway. The mobile nodes automatically  configure the address  using mobile agents first selecting the gateway and  then using the gateway prefix address. The mobile  agents are also used to  track  changes  in  topology  enabling  high  network  con nectivity  with  reduced  delay  in  packet  transmission  to  Internet.  The  performance tradeoffs and limitations with existing  solutions for various mobility conditions are evaluated using simulation.    

References

[1] Ammari H. and El-Rewini H., Performance Evaluation of Hybrid Environments with Mobile Gateways, in Proceedings of the 9th International Sympesium on Computing and Communications , vol. 1, no. 1, pp. 152-57, June 2004.

[2] Broch J., Maltz D., and Johnson D., Supporting Hierarchy and Heterogeneous Interfaces in Multi- Hop Wireless Ad Hoc Networks, in Proceedings of the Workshop on Mobile Computing , Australia, pp. 85-97, June 1999.

[3] Choudhary R., Bhandhopadhyay S., and Paul K., A Distributed Mechanism for Topology Discovery in Ad Hoc Wireless Networks Using Mobile Agents, in Proceedings of Mobicom , pp. 145-146, August 2000.

[4] Jelger C., Noel T., and Frey A., Gateway and Address Auto Configuration for IPv6 Ad Hoc Networks, Internet-draft, April 2004.

[5] Lee J., Hybrid Gateway Advertisement Scheme for Connecting Mobile Ad Hoc Networks to the Internet, in Proceedings of the 57th IEEE VTC 2003 , vol. 1, no. 1, pp. 191-95, April 2003.

[6] Lei H. and Perkins C., Ad Hoc Networking with Mobile IP, in Proceedings of the Second European Personal Mobile Communications Conference , Germany, pp. 197-210, 1997.

[7] Matsuo H. and Mori K., Accelerated Ants Routing in Dynamic Networks, in Proceedings of the International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel /Distributed Computing , pp. 333- 339, 2001.

[8] Ratanchandani P. and Kravets R., A Hybrid Approach to Internet Connectivity for Mobile Ad Hoc Networks, in Proceedings of IEEE Wireless Communications and Networking Conference , pp. 295-304, March 2003.

[9] Ruiz P. and Gomez-Skarmeta A., Adaptive Gateway Discovery Mechanisms to Enhance Internet Connectivity for Mobile Ad Hoc Networks, Ad Hoc and Sensor Wireless Networks , vol. 1, pp. 159-77, March 2005.

[10] Scott M., Joseph P., and Gregory H., Internet Based Mobile Ad Hoc Networking, IEEE Internet Computing , vol. 3, no. 4, pp. 63-70, July-August 1999.

[11] Singh S., Perkins C., Ruiz P., and Clausen T., Ad Hoc Network Auto Configuration: Definition and Problem Statement, http://tools.ietf.org/id/draft-singh-autoconf-adp- 00.txt, July 2005.

[12] Wakikawa R., Malinen J., Perkins C., Nilsson A., and Tuominen A., Global Connectivity for IPv6 Mobile Ad Hoc Networks, (work in progress), http://www.tcs.hut.fi/~anttit/manet/dra fts/draft-wakikawa-manet-globalv6-02.txt, October 2003. Velmurugan Ayyadurai is a lecturer in electronics engineering department in Madras Institute of Technology at Anna University, India. He holds MSc degree in microwave and optical engineering from Madurai Kamaraj University in 1997. He is currently pursuing his research work for PhD degree in information and communication engineering. He has more than 10 years of experienc e in teaching and research. He is supervising MSc student thesis in wireless internet, wireless secur ity and wireless TCP/IP integration. He teaches courses at both BSc degree and MSc degree levels in electronic s and communication engineering. Rajaram Ramasamy is a professor & head of the Department of Computer Science & Engineering, Thiagarajar College of Engineering, Madurai. He has a BSc Degree in electrical and electronics engineering from University of Madras in 1966. He secured the MSc in electrical engineering from IIT Kharagpur in 1971 and the PhD degree from Madurai Kamaraj University in 1979. He Internet Connectivity for Mobile Ad Hoc Networks Using Hybrid Adaptive Mobile Agent Protocol 33 has been teaching computer hardware and software an d supervising research activities. He has published n early 32 papers in journals, seminars and symposia. His a reas of interest are neural networks, fuzzy systems, and genetic algorithms. He has published more than 11 t ext books for schools and colleges in English and one b ook in computer science in Tamil. He served at the Makerere University, Kampala, Uganda during 1977- 1979 and at the Mosul University, Iraq during 1980- 1981. He secured two best technical paper awards fr om the Institution of Engineers (India), one from the Indian Society of Technical Education .