In the current structure of IoT, network layer exists based
on the Internet or the existing communication network. Some
factors endanger information safety on the Internet, and are
also damage IoT information service. But the old network
communication technology is not completely adapted to IoT.
The traditional network routing is simple, and their main
goal is not security. Because of IoT node arrangement
random, autonomic, unreliability of energy limitation and
communication, it leads to that IoT have no infrastructure
and dynamic topology. The attacker can easily cause attacks.
For different network architecture, we needs to set up the
specific authentication cohesive mechanism, the end-to-end
authentication and key agreement mechanism, PKI (Public
Key Infrastructure), WPKI for wireless, Security routing,
Intrusion detection, etc. Due to the huge amount of data,
network availability should be considered. In addition it also
should strengthen cross-domain authentication and crossnetwork authentication in network layer.
Network virtualization technology is widely used. It
greatly reduces the complexity of network management, and
the possibility of wrong operation.
With the development of next generation network (NGN),
and as a transport carrier network in IoT, the construction of
IPv6 is followed. Literature [17] gives the development trend
of IPv6-based information security products. IPv6 network
security mechanism and application of security products are
discussed in detail.