Internet Draft M.Altamash Sheikh, Independent Submission Sanjay Jasola, Intended status: informational Karan Singh, Expires: october 9,2011 Deepak Panwar School of ICT Gautam Buddha University Greater Noida,India. October 8, 2012 True mobility of MobileIPv6 draft-sheikh-true-mobility-01 Abstract This document enhances the mobility of Mobile node's home agent (HAMN) and correspondence node's home agent (HACN) along with the mobility of Mobile Node (MN) and Correspondence Node (CN). Hence this document shows true and complete mobility of MobileIPv6 protocol. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on April 08 2012 Copyright Notice Copyright (c) 2011 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents Sheikh Expires April 08,2012 [Page 1] Internet-Draft True mobility October 2011 carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . .3 2. Terminology. . . . . . . . . . . . . . . . . . . . . . . . .3 3. Various scenarios of Mobility . . . . . . . . ..............4 3.1.When all entities are stationary...........................4 3.2.When MN is mobile and CN,HAMN and HACN are stationary......4 3.3.When CN becomes mobile and MN,HAMN,HACN are stationary.....5 3.4.When MN and CN become mobile and HAMN, HACN are stationary.6 3.5.When HACN becomes mobile and MN,HAMN,CN are stationary.....7 3.6.When CN and HACN become mobile and MN,HAMN are stationary..8 3.7.When HAMN become mobile MN,HACN,CN are stationary..........9 3.8.When CN and HAMN become mobile and MN,HACN are stationary..10 3.9.When HAMN and HACN become mobile and MN,CN are stationary..11 3.10.When HACN,CN,MN are mobile and HAMN is stationary.........12 3.11.When MN and HACN are mobile and CN,HAMN are stationary....13 3.12.When CN,HAMN,HACN are mobile and MN is stationary.........14 3.13.When HAMN and MN are mobile and CN,HACN are stationary....15 3.14.When MN,HAMN,CN are mobile and HACN is stationary.........16 3.15.When MN,HAMN,HACN are mobile and CN is stationary.........17 3.16.When MN,HAMN,HACN,CN are mobile...........................18 4. Security Considerations......................................18 5. Assumptions..................................................19 6.IANA Considerations...........................................19 7.Acknowledgment................................................19 8.References....................................................19 8.1.Normative References.......................................19 8.2.Informative References.....................................19 9.Authors' Addresses............................................20 Sheikh Expires April 08,2012 [Page 2] Internet-Draft True mobility October 2011 1. Introduction In recent years user's data requirement has rapidly increased as compared to past. This data requirement is mostly fulfilled by Internet.Previously user was using wired technology to connect with Internet.With the advancement in the field of wireless and Internet technology,people have started using wireless devices.These wireless device also supports user mobility. MobileIP is an Internet Engineering Task Force(IETF) standard communications protocol that is designed to allow mobile device users to move from one network to another while maintaining a permanent IP address. The MobileIP has several entities like MN, CN,HAMN and HACN. The Mobile IP protocol allows location-independent routing of IP datagram on the Internet. Each mobile node is identified by its home address and not by its current location in the Internet. While away from its home network, a mobile node is associated with a care-of-address which identifies its current location and its home address is associated with the local endpoint of a tunnel to its home agent. MobileIP specifies how a mobile node registers with its home agent and how the home agent routes datagram to the mobile node through the tunnel. Mobile IP for IPv4 (MIPv4)is described in IETF RFC 3344,and updates are added in IETF RFC 4721.MobileIPv4 is a derivative protocol of IPv4 RFC 791.As IPv4 protocol has only 32 bit of address space so it can accommodate only limited number of IP addresses. Hence same problem is faced by MIPv4 protocol. Secondly MIPv4 was not having route optimization procedure which was later updated in RFC 4721. Another version of IP introduced through RFC 2460.This new IP protocol is known as IPv6 which has 128 bit of address space. With this amount of address space it is possible to allocate separate IP address to a single user's multiple devices.Mobility for IPv6 is defined in RFC 3775 called as MobileIPv6. RFC3344 and RFC3775 assumes that home agent is a stationary router. Hence home agents do not change its location with respect to time. This document assumes that home agent is a mobile router.Therefore a mobile router can changes its position with time. This document enhances the mobility of HAMN,HACN along with the mobility of MN and CN.Therefore this document shows true mobility of MIPv6 protocol.How does a HAMN,HACN maintain their connection with MN,CN is out of scope of this document. 2. Terminology Used in This Document Mobile Node(MN) Home Agent of Moble Node(HAMN) Home Agent of Correspondance Node(HACN) Correspondence Node(CN) Sheikh Expires April 08,2012 [Page 3] Internet-Draft True mobility October 2011 3. Various scenarios of Mobility scenario 1: When all entities are stationary This is the case where all the entities are stationary. The MN is connected to its Home agent HAMN with its home link and CN is connected to its own home agent HACN in home link. This is a very normal case and has been discussed in RFC 3775. +++++++++++++++++++++++++++ ++++++++++++++++++++++++++ + + + + + _______ + + ______ + + | HAMN | <---+------------+---------> |HACN | + + _______ + + ______ + + / + + / + + ___ / + + / + + |___| + + ___ + + /___/ + + |___| + + MN + + /___/ + + + + CN + +++++++++++++++++++++++++++ +++++++++++++++++++++++++ MN Network CN Network scenario 2: when MN is mobile and HAMN,CN,HACN are stationary In this case the MN has became mobile and connected to a new foreign network through foreign link. The rest of the entities like HAMN, CN and HACN are stationary to their positions. +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + |HAMN | <----- +---------+----------->|HACN | + + _______ + + _______ + + | + + / + + | + + ___ / + + | + + |___| + + | + + /___/ + + | + + + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ MN Home Network CN Home Network | +++++++++++++++++++++++++++++ + | + + | + + | + + | + + ____ + + |____| + + /___ / + + MN + + + +++++++++++++++++++++++++++++ Foreign Network Sheikh Expires April 08,2012 [Page 4] Internet-Draft True mobility October 2011 scenario 3: When CN become mobile and MN,HAMN,HACN are stationary. In this case the MN is stationary and attached to its Home network.The CN has becomes mobile and attaches itself to a foreign network on a foreign link. +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + | HAMN | <----- +----------+----------->|HACN | + + _______ + + _______ + + / + + | + + ____ + + | + + |___| + + | + + /___/ + + | + + MN + + | + + + + | + +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ MN Home Network CN Home | Network | | | | | | ++++++++++++++++++++++++++++ + | + + | + + | + + | + + ____ + + |____| + + /___ / + + CN + + + ++++++++++++++++++++++++++++ Foreign Network Sheikh Expires April 08,2012 [Page 5] Internet-Draft True mobility October 2011 scenario 4: When MN and CN become mobile and HAMN,HACN are stationary. This is the case when both MN and CN are mobile but HAMN,HACN are stationary. The MN becomes mobile and attached to a foreign link.Similarly CN also becomes mobile and attached to a foreign link to a new foreign link. +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + |HAMN | <----- +---------+----------->|HACN | + + _______ + + _______ + + | + + | + + | + + | + + | + + | + + | + + | + + | + + | + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ MN Home Network CN Home Network | | | | | | | | | | | | +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ + | + + | + + | + + | + + | + | + + | + + | + + ____ + + ____ + + |____| + + |___| + + /___ / + + /___/ + + MN + + CN + + + + + + + + + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ Foreign Network Foreign Network Sheikh Expires April 08,2012 [Page 6] Internet-Draft True mobility October 2011 scenario 5: When HACN becomes mobile and MN,HAMN,CN are stationary. In this case the HACN become mobile and moves to a new location. The rest of the entities MN,HAMN,CN are stationary to their positions. +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + | HAMN | <----- +-------- +----------->|HACN | + + _______ + + _______ + + / + + / | + + ____ + + ___ | + + |___| + + |___| | + + /___/ + + /___/ | + + MN + + CN | + + + + | + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ MN Home Network CN Home| Network | | | | | | +++++++++++++++++++++++++++++ + | + + | + + | + + | + + ___Y____ + + | HACN | + + | | + + _______ + + + + + + + +++++++++++++++++++++++++++++ Foreign Network Sheikh Expires April 08,2012 [Page 7] Internet-Draft True mobility October 2011 scenario 6: When CN and HACN become mobile and MN,HAMN are stationary. This is the case when the CN and HACN become mobile and left their home networks.The rest of the two entities MN and HAMN are stationary and are at there home network.Both entities maybe attached to the same new network or different networks. +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++ + + + + + _______ + + _______ + + |HAMN | <----- +--------- +----------->|HACN | + + _______ + + _______ + + / + + / | + + ____ + + | + + |___| + + / | + + /___/ + + / | + + MN + + / | + + + + | + +++++++++++++++++++++++++++++ ++++++++/++++++++++++++++++ MN Home Network / CN Home| Network / | / | / | / | ++++++++++++++++++++++++++++ + / | + + / | + + / | + + ____ | + + |____| ___Y____ + + /____/ |HACN | + + CN | | + + ______ + + + + + + + ++++++++++++++++++++++++++++ Foreign Network Sheikh Expires April 08,2012 [Page 8] Internet-Draft True mobility October 2011 scenario 7: When HAMN becomes mobile and MN,HACN,CN are stationary. In this case the HAMN becomes mobile and moves towards a new location. The rest of the three entities MN,CN,and HACN are stationary in their network. +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + | HAMN | <----- +----------+----------->|HACN | + + _______ + + _______ + + / | + + / + + ____ | + + ___ + + |___| | + + |___| + + /___/ | + + /___/ + + MN | + + CN + + | + + + +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ MN Home| Network CN Home Network | | | | +++++++++++++++++++++++++++++ + | + + | + + | + + | + + __Y____ + + | HAMN | + + | | + + _______ + + + + + + + +++++++++++++++++++++++++++++ Foreign Network Sheikh Expires April 08,2012 [Page 9] Internet-Draft True mobility October 2011 scenario 8: When CN and HAMN become mobile and MN,HACN are stationary. In this case the CN becomes mobile and moves to a new network. Similarly the HAMN also becomes mobile and moves to a new location.In this case the remaining entities MN and HACN are stationary to their networks. +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++ + + + + + _______ + + _______ + + | HAMN | <----- +---------- +----------->| HACN | + + _______ + + _______ + + / | + + | + + ____ | + + | + + |___| | + + | + + /___/ | + + | + + MN | + + | + + | + + | + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++ MN Home| Network CN Home Network | | | | | | | | | | +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++ + | + + | + + | + + | + + | + + | + + | + + | + + __Y____ + + ___ + + | HAMN | + + |___| + + | | + + /___/ + + _______ + + CN + + + + + + + + + + + + + + + + + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++ Foreign Network Foreign Network Sheikh Expires April 08,2012 [Page 10] Internet-Draft True mobility October 2011 scenario 9: When HAMN and HACN become mobile and MN, CN are stationary. The HAMN and HACN become mobile and moved towards a new location by leaving behind their previous locations.The MN and CN are stationary to their positions. ++++++++++++++++++++++++++++ +++++++++++++++++++++++++++ + + + + + + + + + + + + + _______ + + _______ + + |HAMN | <---- +----------- +----------->|HACN | + + _______ + + _______ + + / | + + / | + + ____ | + + ____ | + + |___| | + + |___| | + + /___/ | + + /___/ | + + MN | + + CN | + + | + + | + + | + + | + ++++++++++++++++++++++++++++ +++++++++++++++++++++++++++ MN Home| Network CN Home Network | | | | | | +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++ + | + + | + + | + + | + + | + + | + + __Y____ + + _Y_____ + + |HAMN | + + |HACN | + + | | + + | | + + _______ + + _______ + + + + + + + + + + + + + + + + + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++ Foreign Network Foreign Network Sheikh Expires April 08,2012 [Page 11] Internet-Draft True mobility October 2011 scenario 10:When HAMN is stationary and MN,CN,HACN are mobile. In this case only HAMN is stationary and attached to its home network and rest of the entities like CN,MN, and HACN are mobile and move to a new location. +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + | HAMN | <----- +--------- +----------->|HACN | + + ________ + + -------- + + | + + / | + + | + + / | + + | + + / | + + | + + / | + + | + + / | + + | + + / | + +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ MN Home |Network C N Home | Network | / | | / | | / | ++++++++++++++++++++++++++++++ / | + | + +++++++/++++++++++++++++++++ + | + + / | + + | + + / | + + | + + / | + + Y + + ___ | + + ___ + + |____| ___Y___ + + |___| + + /____/ | HACN | + + /___/ + + CN | | + + MN + + ______ + + + + + + + + + + + + + ++++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ Foreign Network Foreign Network Sheikh Expires April 08,2012 [Page 12] Internet-Draft True mobility October 2011 scenario 11:When MN and HACN are mobile and HAMN,CN are stationary. In this case MN and HACN are mobile and move towards new locations. The rest of entities like CN and HAMN are stationary to their positions. +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + | HAMN | <----- +---------+----------->| HACN | + + _______ + + _______ + + | + + / | + + | + + ___ | + + | + + |___| | + + | + + /___/ | + + | + + CN | + + | + + | + +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ MN Home Network CN Home| Network | | | | | | | | | | | | | | | | +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ + | + + | + + | + + | + + | + + | + + | + + | + + ____ + + ___Y____ + + |___| + + |HACN | + + /___/ + + | | + + MN + + _______ + + + + + + + + + + + + + +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ Foreign Network Foreign Network Sheikh Expires April 08,2012 [Page 13] Internet-Draft True mobility October 2011 scenario 12: When HAMN,HACN and CN are mobile and MN is stationary. In this case MN is stationary to its home network. The other entities like HAMN,CN and HACN are mobile and haved moved towards new locations. +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + | HAMN | <----- +---------+----------->|HACN | + + _______ + + _______ + + ____ /| + + / | + + |___| | + + / | + + /___/ | + + / | + + MN | + + / | + + | + + / | + + | + + / | + + | + + / | + +++++++++++++++++++++++++++++ ++++++++/++++++++++++++++++++ MN Home Network / CN Home| Network | / | | / | | / | | / | +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ + | + + / | + + | + + / | + + | + + / | + + | + + / | + + | + + / | + + | + + ____ | + + Y + + |____| ___Y__ + + _______ + + /____/ |HAMN | + + |HAMN | + + CN | | + + | | + + ______ + + ______ + + + + + + + + + + + +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ Foreign Network Foreign Network Sheikh Expires April 08,2012 [Page 14] Internet-Draft True mobility October 2011 scenario 13:When HAMN and MN are mobile and HACN,CN are stationary. In this case MN and HAMN become mobile and move toward the new locations.The other two entities like CN and HACN are stationary to their locations. +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + | HAMN | <----- +-------- +----------->|HACN | + + _______ + + _______ + + | + + / + + | + + ___ / + + | + + |___| + + | + + /___/ + + | + + CN + + | + + + + | + + + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ MN Home Network CN Home Network | | | | | | | +++++++++++++++++++++++++++++ + | + + | + + | + + Y + + ____ ______ + + |____| |HAMN | + + /___ / | | + + MN ______ + + + + + + + +++++++++++++++++++++++++++++ Foreign Network Sheikh Expires April 08,2012 [Page 15] Internet-Draft True mobility October 2011 scenario 14:When MN,HAMN,CN are mobile and only HACN is stationary. In this scenario all entities like MN,CN and HAMN are mobile and move towards the new locations. HACN is stationary to its own position. +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ + + + + + + + + + + + + + + + + + + + + + _______ + + _______ + + |HAMN | <----- +-------- +----------->|HACN | + + _______ + + _______ + + /| + + | + + / | + + | + + / | + + | + + / | + + | + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ MN Home Network CN Home| Network / | | / | | / | | / | | / | | / | | +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ + / | + + | + + / | + + | + + / | + + | + + Y + + | + + ____ ______ + + Y + + |____| |HAMN | + + __ + + /___ / | | + + |___| + + MN ______ + + /___/ + + + + CN + + + + + + + + + +++++++++++++++++++++++++++++ +++++++++++++++++++++++++++++ Foreign Network Foreign Network Sheikh Expires April 08,2012 [Page 16] Internet-Draft True mobility October 2011 scenario 15:When CN is stationary and MN,HAMN,HACN are mobile. In this scenario only CN is stationary to its home network and rest of the entities like MN,HAMN and HACN are mobile and moves towards new location. +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ + + + + + + + + + + + + + + + + + + + + + _______ + + _______ + + | HAMN| <-------+----------+----------->|HACN | + + _______ + + _______ + + /| + + / | + + / | + + ___/ | + + / | + + |___| | + + / | + + /___/ | + + / | + + CN | + +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ MN Home Network CN Home| Network / | | / | | / | | / | | / | | / | | +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ + / | + + | + + / | + + | + + / | + + | + + Y + + | + + ____ ______ + + Y + + |____| |HAMN | + + ______ + + /___ / | | + + |HACN | + + MN ______ + + | | + + + + ______ + + + + + + + + + + + + + +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ Foreign Network Foreign Network Sheikh Expires April 08,2012 [Page 17] Internet-Draft True mobility October 2011 scenario 16: When all entities are mobile This is the scenario where all the entities are mobile and have moved towards new locations.In this case no entity is stationary. +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ + + + + + _______ + + _______ + + | HAMN | <----- +----------+----------->|HACN | + + _______ + + _______ + + /| + + / | + + / | + + / | + + / | + + / | + + / | + + / | + +++++++++++++++++++++++++++++ ++++++++++/+++++++++++++++++ MN Home Network /CN Home| Network / | | / | / | / | / | / | / | +++++++++++++++++++++++++++++ ++++++++/+++++++++++++++++++ + / | + + / | + + / | + + / | + + / | + + / | + + Y + + / | + + ____ ______ + + / Y + + |____| |HAMN | + + ___ ______ + + /___ / | | + + |___| |HACN | + + MN ______ + + /___/ | | + + + + CN + + + + + +++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++ Foreign Network Foreign Network 4. Security Considerations This draft shows the various scenarios when home agent is a mobile router.In cases of 3.1,3.2,3.3,3.4 the security asso- ciation will be as defined by RFC [3775]. For rest of the mobility cases an entirely new security mechanism or a modified version of IPSec can be defined. As all the previously defined security mechanismlike IPSec considered router to be a stationary device.In this document we assumed that home agent(HAMN,HACN)is a mobile router.Due to router's mobility security is an issue of concern.In RFC3775 authentication like key exchangeof MN,CN were possible because of stationary router.Once the router itself become mobile and changes its location with respect to time so the authentication of MN,CN can not be executed properly.Due to mobility router it self having various kinds of security issues.Hence there is a need to revise all the security mechanism stated so far to support router mobility. Sheikh Expires April 08,2012 [Page 18] Internet-Draft True mobility October 2011 5. Asumptions 5.1.HAMN,HACN is a mobile router. 5.2.Foreign network whic is visited by MN,HAMN,CN or HACN may be same or maybe different. 5.3.How does a HAMN,HACN maintain their connection with MN,CN is out of the scope of this document. 6. IANA Considerations This document has no actions for IANA. 7. Acknowledgment This work is supported by Dr.Karan singh,Dr. Rajesh Mishra,and Arun singh from school of ICT,Gautam Buddha University. Gr.Noida. 8. References 8.1. Normative References [RFC 3344] Perkins,C.,Ed.,"IP Mobility Support for IPv4",RFC 3344 August 2002. [RFC 4721] Calhoun,J.,Bharatia,"Mobile IPv4 Challenge/Response Extensions(Revised)",RFC 4721,January 2007. [RFC 791] Postel, J., "Internet Protocol", STD 5, RFC 791, September 1981. [RFC 2460] Deering,S.,Hinden, R.,"Internet Protocol, Version 6 (IPv6)"RFC 2460,December 1998. [RFC 3775] Johnson, D., Perkins, C., and J. Arkko, "Mobility Support in IPv6", RFC 3775, June 2004. 8.2. Informative References [Sax06] Saxena,P.,C,Jasola,S., "A New Model For Mobility Of correspondence Node in MobileIPv6" Journal of CSI Vol. 36.No.1March2006,pp.20-28. [Sax06] Saxena,P.,C.,Jasola,S., "Performance of intelligent MobileIPv6" Computer Standards & interfaces Volume 28, Issue 6, September 2006,pages 737-751 [Sax06] Saxena,P.,C.,Jasola,S., "Mobility management on IP based Networks" IETE Technical review, Vol23. No1; Jan- Feb2006,pp.35-46. Sheikh Expires April 08,2012 [Page 19] Internet-Draft True mobility October 2011 9. Authors' Addresses Mohd. Altamash Sheikh 240, CSJM hostel Gautam Buhddha University. Greater Noida,India. Phone: +91 9560244429 Email: altsheikh@gmail.com Prof.Sanjay Jasola School of ICT Gautam Buhddha University. Greater Noida,India. Phone: +91 0120-2346074 Email: sjasola@yahoo.com Sheikh Expires April 08,2012 [Page 20]