No one knows? And this is an item T-Mobile sells?
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Apologies for the delay in responses. I also have Comcast Internet (with a non-Comcast modem) and also looked into this a few weeks ago. I was trying to change the DNS server to that of Google's (18.104.22.168) and also explored the IPv6 settings in that process. What I believe I found was that IPv6 is NOT supported on the T-Mobile Cellspot router; even though it is an option. Or perhaps I wasn't able to properly set it up and was lead to believe it wasn't supported.
I believe your resolution would be to stay with IPv4, even though in the near future we may need to be exploring these settings again. I do suggest you alter the DNS settings to Google's; it does seem to have a noticeable impact on experience!
If you have any further questions or comments please let me know and I will get back to you!
Hey edwardp and thanks for posting.
Sounds like you're really tech savvy however there are settings included that T-Mobile doesn't support changing. Basically, T-Mobile can helps with the initial setup that makes sure you have the default settings needed for the router to work as intended. I agree if it's working on IPv4, you should keep it on that setting.
I am leaving my Personal CellSpot router on IPv4, but I suspect that WiFi Calling doesn't work under IPv6, as I connected to a Comcast Business Cisco gateway earlier today and WiFi Calling worked perfectly through that, as the phone received an IPv4 address from it.
I can confirm that if my router is on IPV6 mode the Cellspot will not initialize once there is a loss of power or if I reboot the Cellspot. I have to log into my router ASUS RT-AC66R, turn off IPV6, reboot router & Cellspot then it will connect. Once that is complete I can re-activate IPV6 & all is well until the next loss of power or something.
There is an IPV6 firewall in the stock ASUS firmware, I am wondering if that has anything to do with it. Not sure whats the deal with IPV6 because while watching the outgoing request I can see the Cellspot connected to a few T-mobile servers using ports
22.214.171.124:123 while on IPV6 mode.
There must be a request or something that comes back to the Cellspot that gets blocked while on IPV6. I am going to try turning off the IPV6 firewall & see if it works & I'll report back.
Well what I posted is wrong. It will work with IPV6 activated! It was my QOS rules that was preventing it from initializing. That was the only thing I was overlooking. If I turn off QOS but leave IPV6 on & reboot the Cellspot it works. The only thing I could find wrong was my speeds were entered incorrectly in the QOS interface.