An Assessment of Mobile Ad-Hoc Network (MANET) Issues Jerry Usery CS 526 May 12 th, 2008
MANET Issues - Overview History Uses Technical Concerns DSR and AODV Routing Security
MANET Issues - History Three generations of ad-hoc network systems 1 – 1972, PRNET ALOHA, CSMA 2 – 1980s, SURAN Packet-switched network No infrastructure Increased radio performance 3 – Current generation
MANET Issues - Uses Growing need Emergency and rescue operations Disaster relief efforts Military networks Flexibility and speed of set-up is key
MANET Issues – Technical Concerns Routing has been problematic Existing Internet protocols intended for fixed infrastructure Limited success with conventional protocols at each router Bandwidth, power constraints, topology changes and SECURITY concerns Link state protocols (bandwidth, reliability issues) On-demand protocols (frequent topology changes)
MANET Issues – DSR and AODV Routing DSR Simple, specifically designed for MANETs Implemented on several testbeds Connected to Internet Route discovery & maintenance Scales automatically Allows multiple routes to any node Designed for approximately 200 nodes, unicast IPv4 packets
MANET Issues – DSR and AODV Routing (Cont) AODV Experimental protocol Rapid adaptation to dynamic link changes Low use of the network Low memory overhead and processing Finds unicast routes within the network Uses destination sequence numbers (no loops) Nodes notified when link is broken IPv6 packets
MANET Issues – Security Major Issue with as needed connections Client-server structure does not apply Availability, confidentiality, integrity, authentication, non- repudiation all face challenges Dynamic security solution required External attacks Active - Erroneous routes, replaying old information, false route queries, distortion of route information Passive - Eavesdropping data, analyzing traffic Internal attacks Compromised nodes can use standard security to protect their attacks Valid signatures must be validated
MANET Issues Questions?