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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?
That’s really helpful. Everything seems to point to a carrier-grade NAT system.
Using whatsmyip.org and Whois, my ip from my ISP is not the same as the ip on my router.
Looks like I’m up the creek.
Using whatsmyip.org and Whois, my ip from my ISP is not the same as the ip on my router.
Looks like I’m up the creek.