Comcast Xfinity IPv6 Setup and Configuration Explained

To enable IPv6 on your Comcast Xfinity router, you'll need to access the router's settings page, which can be done by typing its IP address into a web browser.

The default IP address for Comcast Xfinity routers is 192.168.0.1 or 10.0.0.1, depending on the model.

Once you're logged in, navigate to the Advanced Settings or IPv6 settings section, where you'll find the option to enable IPv6.

Enabling IPv6 on your router will automatically assign an IPv6 address to your device, but you may also want to configure other settings, such as setting a static IPv6 address or enabling IPv6 on specific devices.

For your interest: Comcast Xfinity Router Ip Address

Comcast Xfinity IPv6 setup typically uses DHCPv6 with RA (Router Advertisement) and PD (Prefix Delegation).

To get started, you'll need to allow ICMPv6.

Comcast residential customers in the Atlanta area can use DHCPv6 to get IPv6 on their pfSense.

You can also use 6RD Tunnel, but it's not clear if that's preferred by Comcast.

It's worth noting that Comcast uses DHCPv6 with RA and PD, which is a common setup for IPv6.

You can try using DHCPv6 with RA and PD to see if it works for you.

Take a look at this: Can I Use My Own Modem with Comcast Xfinity

COMCAST uses DHCPv6 with RA (Router Advertisement) and PD (Prefix Delegation).

To get a globally-routable IPv6 prefix, you can request one on-demand using DHCPv6 from the gateway router via prefix delegation.

You'll need to allow ICMPv6 for IPv6 to work properly.

If your interface toward the cable modem is ether1, you can use DHCPv6 to get a prefix delegation.

COMCAST allows residential customers in the Atlanta area to get IPv6 using DHCPv6.

Check this out: Reset Xfinity Wifi

In IPv6, networks are supposed to auto-configure the default route via routing advertisements.

RouterOS configured as routers will ignore RA messages by default, so we need to change this setting for a home gateway router.

We recommend setting add-default-route=no to forward IPv6 traffic to the Internet by default, which tells the router to get next-hop information from your ISP via RA messages instead of DHCPv6.

Only if local testing shows that this doesn't work should you try setting add-default-route=yes on the DHCPv6 client.

Enabling both methods might create conflicting routes, so it's best to find out which one works on your local slice of the Xfinity network and stick with it.

Intriguing read: Comcast Xfinity Router Settings