One of the arguments for moving to version 6 of the Internet Protocols is that it will offer more security. This may well be true in the long run. But for the time being, IPv6 is likely to introduce more complexity and create more problems than it solves. “The hackers currently have the lead
Since 2003, there have been hundreds of attacks using IPv6 tunneling as an evasive technique for sending malicious packets through firewalls and other monitoring tools. As more equipment is IPv6-enabled and tunneling is used to accommodate both versions 4 and 6 of the protocols on the same network, these and other attacks are likely to become more common.

The link for this article located at GCN.com is no longer available.