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We are attempting to configure a RUT955 as a VPN Server using Mobile Data via Vodaphone New Zealand.  We were able to successfully and easily setup a similar system in Europe on a RUT950.

The RUT955 has a good, public-IP based connection via the Mobile WAN.  We were able to configure Dynamic DNS and get a valid public IP address via a hostname at hopto.org

However, I cannot seem to ping that address, nor can I get any connection via even relatively simple L2TP or PPTP VPN connections.  I have reset to factory defaults and tried a couple times, assuming there would be very little that needs configured to get to this level (as was the experience with the 950 here).  Is there something simple that I am forgetting to enable that will allow us to ping the 955 via its public IP address?

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Hi,

By default router should answer to ICMP (pings). Perhaps your GSM provider blocking ICMP.

Can you reach router remotely using its WAN IP?
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No - that seems to be the core of the issue.  I also assumed it should work by default.  Is there an easy way to determine if it's being blocked by the GSM provider, or if the issue lies elsewhere?

Thanks.

Danny
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You could reinstall router firmware and try again: https://wiki.teltonika.lt/view/RUT9xx_Firmware

Also, be sure that router get public IP and be sure that you have enabled remote access in System -> Administration -> Access Control.

Another way would be to test with another device/router.
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OK - I dug a little deeper and I see that the IP Address assigned to the Router by the carrier is in the range 100.115.x.x.  I believed this was a 'public' address, but evidently there is a block of IP Addresses I wasn't aware of that is known as a "Carrier Grade NAT" to which this belongs.

https://en.wikipedia.org/wiki/Carrier-grade_NAT

So, that explains the issue and I learned something new today.

Thanks so much!

Danny