Windows Server 2003 currently supports the use of IPv6 only when IPv4 is also installed. Because TCP/IP internetworks are susceptible to a variety of attacks, ranging from passive attacks, such as eavesdropping, to active attacks, such as denial-of-service attacks, be sure to follow best practices for security when using IPv6 on your network. A few general and IPSec-related IPv6 security suggestions follow.
Be aware of the following known security risks for IPv6, and consider reconfiguring your system to meet the recommendation that is shown for each:
The installation of an unauthorized router can cause reconfiguration of clients and rerouting of IPv6 traffic.
To communicate ...