The network topology of MANETs changes
rapidly and unpredictably and due to the changing topology
packet loss is a common phenomenon. Routing protocols used
in MANETs are based on the assumption that, all participating
nodes will be fully cooperative. But, due to the open structure
node misbehavior may exist and packet loss occurs. Among
them one type of misbehavior is that some nodes will take part
in route establishment processes but they do not respond to
forward data packets and simply dismiss the packets. The
2ACK scheme has a higher routing overhead which is caused
by the transmission of 2ACK packets. So by reducing the
acknowledgment ratio, Rack, the number of 2ACK
transmissions can be significantly lowered. The ENHANCED
2ACK scheme is immune to the limited overhearing range
issue caused due to low transmission power in the
communication link. It solves the problem of ambiguous
collisions, receiver collisions, and limited transmission power.
Ms. Farha Nausheen : graduated in Information Technology in
2007 from Muffakham Jah College of Engineering and
Technology and did her M.Tech in Computer Science in 2012
from the same college. She is currently Asst. Professor in the
Dept of IT, Muffakham Jah College of Engg. & Technology
since 2008. She is a member of Association for Computer
Machinery (ACM). Her areas of interest are Digital Electronics,
Data Structures, and Computer Networks.
Ms. Sayyada Hajera Begum : graduated in Information
Technology from Muffakham Jah College of Engineering and
Technology and did her M.Tech from Jawaharlal Nehru
Technological University, Hyderabad. She is currently Asst.
Professor in the Dept of IT, Muffakham Jah College of Engg. &
Technology since 2007. She is a member of Association for
Computer Machinery(ACM). Her areas of interest are Digital
Electronics, Data Structures, Computer Networks.
MANET
OLSR Protocol
2ACK scheme
Enhanced-2ACK
This paper presents ENHANCED-2ACK perform better
in the presence of misbehaving nodes. Also it is proved
that ENHANCED2ACK has lesser routing overhead and
more advantageous than previous similar acknowledgement based schemes as it requires lesser
number of acknowledgement packet transmission. It
shows the comparison of ENHANCED-2ACK, with
previously proposed acknowledgement based schemes,
based on criteria of detection of malicious link or node
and number of acknowledgement packets transmitted,
with the increase in number of nodes on active route.
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