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Forum Discussion
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?
> [...] 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?
Final update. With the knowledge I got here, I worked with the ISP. They confirmed they use a network NAT and they needed to “open the NAT” for me. I pieced together they had done upgrades on the area which may have defaulted a previous passthrough.
After they pushed a fix, I had a moderate NAT and I could then port forward the Xbox ports to get an open NAT.
Thanks for the advice!
After they pushed a fix, I had a moderate NAT and I could then port forward the Xbox ports to get an open NAT.
Thanks for the advice!
Glad you figured it out and got it working better.
Enjoy.
inky_thoughts wrote:
Final update. With the knowledge I got here, I worked with the ISP. They confirmed they use a network NAT and they needed to “open the NAT” for me. I pieced together they had done upgrades on the area which may have defaulted a previous passthrough.
After they pushed a fix, I had a moderate NAT and I could then port forward the Xbox ports to get an open NAT.
Thanks for the advice!
