This chapter provides an overview of the current security issues in an IPv6 based networking environment and suggests a number of helpful security “guidelines”.

First we will analyse how the IPv6 changed the security of IP networking environment. We will concentrate on the threat analysis compared with IPv4. Then we will discuss the major building block of a security architecture: IPv6 firewalls. Finally we will discuss the security implications of deploying various IPv4-IPv6 co-existnce and transitioning mechanisms.