IPv6

IPV6 has to be supported by your router and your ISP. IPV6 is already built into Xbox and when it detects it you're set.

Comcast is my ISP and their network supports IPV6.

I have a netgear router that supports IPV6 and it's just a matter of logging in to the router and enabling the IPV6 feature.

first: your isp must use ipv6 and u must be able to get ipv6

second: your router must use ipv6, see first

and last, your xbox should use ipv6 if first and second is ok.

but be aware, you can have problems with ipv6

It might be that your ISP is using IPv6 and tunneling IPv4 via CG-NAT and DS-Lite.

While IPv6 is generally a Good Thing to have (as the Xbox One primarily uses IPv6, and even if you only have IPv4, it will use IPv6 tunneled through IPv4), you might want to check with your ISP if they offer you a "Dual Stack" connection with IPv6 and a
real public IPv4 in parallel.

There really isn't much you can do on the console itself, as it does check automatically what IP protocol your ISP provides, and if it's IPv6, then the console will use IPv6. If it's a Dual Stack, where you have IPv4 natively (not tunneled through IPv6)
and IPv6, then the console will use both, and if it's an IPv4 connection, it'll tunnel IPv6 through IPv4 through Teredo.

IPv6 depends on your Internet Provider and your router being able to provide IPv6 in your network.

Your PC can be set up to use tunneling techniques to use IPv6 through IPv4 tunneling, and the Xbox does this as well.

Most networking stuff in regards to multiplayer and party chat supposedly run via IPv6, and if IPv6 isn't natively available, Teredo is used to tunnel IPv6 through IPv4.

So please ask your ISP if they natively provide IPv6 (ideally in a dual stack configuration with IPv4 in parallel), and check the documentation of your router if it supports IPv6 as well.

IPv6 is not really needed in the household, but ISP's use ipv6 with ipv4 or just ipv6 externally, this is automatically done by the router so nothing to setup, if you want ipv6 inside the house then you need to access your router settings.

If you have ipv6 assigned by your ISP then your xbox will see this.