For anyone on a MX67C/MX68C running into issues with integrated cellular and custom APN's, try upgrading to MX 17.6 firmware. I was running into lots of issues with the integrated cellular on older firmware: some devices I could not set a custom APN myself (had to be set on the backend by Meraki support), and none of my devices would seem to take the public static IP APN from our cellular carrier (would never get the assigned public IP, always got a CGNAT IP). After upgrading to MX 17.6, all of these issues went away. My understanding is that the cellular portion of the MX 17.x firmware is now the same as what is used in the MG line of products. In addition, there are a number of undocumented improvements in MX 17.x like: Eliminated that the flood of "events dropped" that appear in the event log on devices with integrated cellular modems even if the modem was disabled and there was no SIM installed. New Cellular Status tab on local status page. Ability to set APN from local status page. Ability to set APN username and password from local status page. Ability to set cellular IP type from local status page. If you aren't having any luck between Meraki support and your cellular provider, give MX 17.6 a shot.
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