By Susan Perschke, Network World November 28, 2011 06:10 AM ET If your IPv6 strategy is to delay implementation as long as you can, you still must address IPv6 security concerns right now. If you plan to deploy IPv6 in a dual-stack configuration with IPv4, you're still not off the hook when it comes to security. And if you think you can simply turn off IPv6, that's not going to fly either. Panic t