I am trying to set up IPv6 on my Airport Extreme. According to AT&T / BellSouth, my network is IPv6 ready.

Network Setup
-------------

I currently have two parts to my network setup.

1. Westell Model 6200 modem (IPv6 ready)
2. AirPort Extreme (fifth generation)
3. AirPort Express (the last model that plugs directly into the wall)

My modem is plugged directly into the wall via a DSL cable, and then my router is connected to the modem via an Ethernet cord.

Setting Up IPv6
---------------

![AirPort Utility Setup](https://i.stack.imgur.com/I17jG.png)
I tried setting this up on my own in 2012, but the interface of AirPort Utility has changed drastically since then, and I also recall losing all Internet capabilities when I "set it up" last time, so I want to make sure I do it correctly this time.

Upon choose a manual configuration, I'm greeted with different options about whether I want to choose a Native or Tunnel Mode, whether I want to enable IPv6 Connection Sharing, and more.

![Example of Options](https://i.stack.imgur.com/hwdXd.png)

I'm not sure which of these options is the "preferred" method, or what is required of me to properly configure AirPort Extreme to use IPv6.

I am willing to plug and play different configuration options to see what works best.