Why are you relying on the provided modem? It's almost certainly not going to do what you want. Buy your own modem/firewall device. That way you'll be able to make all the DMZ features you want. 

On Sat, Jan 14, 2023, 12:12 Steve L via 44net <44net@mailman.ampr.org> wrote:
I'm a Spectrum customer in Wisconsin, though its not fiber to the
premise here.  It's over cable using docsis.  I am using my own modem
(SB8200) and have had no problems for years.

Hope this helps.

Steve, KB9MWR

On Sat, Jan 14, 2023 at 9:33 AM Lee D Bengston via 44net
<44net@mailman.ampr.org> wrote:
>
> Hello to those on the list.
>
> Spectrum (formerly Charter) laid new fiber in my neighborhood and is offering a pretty enticing deal, especially considering I'm on a vdsl based service now. My current ISP has a router with a "pass-through" DMZ mode, which I use to get protocol 4 to a Ubiquiti router that runs ampr-ripd.
>
> Is there anyone on the list that is using a relatively new service from Spectrum and is able to pass protocol 4 for amprnet?
>
> Thanks and 73,
> Lee K5DAT
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