Secure High-Throughput Multicast Routing in Wireless Mesh Networks

[attachment=17423]

INTRODUCTION
WIRELESS mesh networks (WMNs) emerged as a promising
technology that offers low-cost high-bandwidth
community wireless services. A WMN consists of a set of
stationary wireless routers that form a multihop backbone,
and a set of mobile clients that communicate via the wireless
backbone. Numerous applications envisioned to be deployed
in WMNs, such as webcast, distance learning, online games,
video conferencing, and multimedia broadcasting, follow a
pattern where one or more sources disseminate data to a
group of changing receivers. These applications can benefit
from the service provided by multicast routing protocols.


HIGH-THROUGHPUT MULTICAST ROUTING
We consider a multihop wireless network where nodes
participate in the data forwarding process for other nodes.
We assume a mesh-based multicast routing protocol, which
maintains a mesh connecting multicast sources and
receivers. Path selection is performed based on a metric
designed to maximize throughput. Below, we provide an
overview of high-throughput metrics for multicast, then
describe in details how such metrics are integrated with
mesh-based multicast protocols.



High-Throughput Mesh-Based Multicast
Routing
Multicast protocols provide communication from sources to
receivers organized in groups by establishing dissemination
structures such as trees or meshes, dynamically updated as
nodes join or leave the group. Tree-based multicast
protocols (e.g., MAODV [7]) build optimized data paths,
but require more complex operations to create and maintain
the multicast tree, and are less resilient to failures. Meshbased
multicast protocols (e.g., ODMRP [6]) build more
resilient data paths, but have higher overhead due to
redundant retransmissions.


ATTACKS AGAINST HIGH-THROUGHPUT
MULTICAST
In this section, we present attacks against high-throughput
multicast protocols. In particular, we focus on attacks that

DONG ET AL.: SECURE HIGH-THROUGHPUT MULTICAST ROUTING IN WIRELESS MESH NETWORKS 655
2. Several studies [26], [28] show that the overhead caused by
rebroadcasting some of the flood packets is reasonable, validating the
effectiveness of this weighted flood suppression strategy.