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Solved
CM500 Cable Modem Creating Double NAT
Setup: CM500-100NAS on Firmware v1.01.05 Cable Modem Ethernet out to eero Gateway wireless router Xbox One five feet from router, connected wirelessly For a couple weeks, I've shown a strict NA...
> [...] a double NAT would mean I have NAT happening on the modem as
> well as the router. [...]Well, somewhere, but a modem can't do it. Another possibility:
https://en.wikipedia.org/wiki/Carrier-grade_NAT
> [...] I'm wondering if it's something jacked up on the ISP side.
Carrier-grade NAT would qualify.
Have you looked at the IP address of the WAN/Internet interface on
your router? Plug that address into the form at:
https://whois.arin.net/ . Is it a public address or a private address?
What happens if you directly connect the xbox to the modem, with out any router in the middle?
Press and hold the front power button on the xbox until it turns off then release. Then turn it back on.
You might also try changing ports manually on the xbox as well, see the xbox networking get into a bad state. Change to something else in the xbox drop down menu under advanced settings under networking.
Thanks for the suggestion.
When I directly connect the Xbox to the Ethernet out from the modem, it still has a strict NAT. In detailed network statistics on the Xbox, it says my network is behind a port-symmetric NAT.
And that’s direct from the modem.
When I directly connect the Xbox to the Ethernet out from the modem, it still has a strict NAT. In detailed network statistics on the Xbox, it says my network is behind a port-symmetric NAT.
And that’s direct from the modem.
Power OFF the modem for 1 minute then back on.
Press and hold the front power button on the xbox until it turns off then release. Then turn it back on.
You might also try changing ports manually on the xbox as well, see the xbox networking get into a bad state. Change to something else in the xbox drop down menu under advanced settings under networking. I have done this a few times then got OPEN NAT after the change.
IF this doesn't change anything, I would check with the ISP to see if anything is happening there. Possible xbox service issue as well though I doubt it,