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9 hours ago, Hst said:

How do you set up the DMZ I know how to navigate to it.

On your modem, go to Advanced > DMZ, press Enable, and put the WAN IP address of the Netduma router into the v4 host fields. I believe you can find the WAN IP for this in the Device Manager on the old R1 firmware. You may also be able to find it on your modem too if it has a Device List.

Then leave the v6 host fields blank. Now press save.

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It doesn’t appear I’m able to disable the IPv6 address, it doesn’t show me an option to.

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Does your modem have a page where you can see a list of connected devices? Does it list what IPv6 address it thinks the R1 is using?

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My modem does have a page for connected devices but it does not list a lPv6 address for the Netduma 

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Could you check your user guide? I see there's a link at the bottom on your Xfinity modem's setup page. I don't understand why it won't let you enter just an IPv4 address for the DMZ, but since i'm not an Xfinity support engineer I can't really help you with that i'm afraid.

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