Block
IPv6 over IPv4 ( Teredo ) is blocked by default
Teredo is a platform-independent
protocol developed by Microsoft®, which is enabled by default in Windows Vista™. Teredo provides
a way for nodes located behind an IPv4 NAT to connect to IPv6 nodes on the Internet. However, by
tunneling IPv6 traffic over IPv4 UDP through the NAT and directly to the end node, Teredo raises
some security concerns. Primary concerns include bypassing security controls, reducing defense in
depth, and allowing unsolicited traffic. Additional security concerns associated with the use of
Teredo include the ability of remote nodes to open the NAT for themselves, how it may benefit
worms, ways to deny Teredo service, and the difficulty in finding all Teredo traffic to inspect.
Block IPV6
As SEP does not support IPV6.