Meraki sent this email out earlier this week:      Hello Meraki customer, With the introduction of firmware version MX18.2, Cisco Meraki engineering deprecated ongoing support for USB modems on MX and Z appliances. You are receiving this email because we have identified that you have one or more USB modems connected to MX device(s) within your network. Details: Currently, MX and Z appliances on all versions of MX18 only receive engineering support related to critical security vulnerabilities for your USB modems. With the release of MX19.1, third-party USB modems may continue to work with a Meraki MX or Z appliance; however, the Cisco Meraki engineering team will not provide any support. Third-party USB modem support will be removed entirely in firmware MX20.1. All support for USB modems will be deprecated next year, on June 30, 2026. Recommended customer action: We recommend you work with your account manager or reseller to find an alternative connectivity solution, such as the Meraki MG, before all USB modem support is deprecated on June 30, 2026. More details about this deprecation and recommended next steps can be found in our FAQ. Thank you for your attention to this matter. If you have any questions or concerns not covered in our FAQ, please contact Meraki Technical Support for assistance. Regards, Meraki Technical Support   ... View more

The Apple networking problem went away after upgrading the affected AppleTVs to tvOS 26.1 Public Beta so it appears Apple figured out they did something wrong - but only on the newest model of AppleTV.  An older model I tried on the beta still has the problem. ... View more

Eventually I got captures to work and was able to catch the EdgeRouter-X sending traffic from the VLAN2 VIF on VLAN1 so I now see that MX19 was better than MX18 in that regard.  I deleted the VLAN2 vif on the EdgeRouter-X and will move back to MX19. That leaves the Apple networking problem? ... View more

I have elected to back out to MX 18.211.6 as I found MX 19.1 and 19.2 seemingly cannot sort out the small switch I use for the T-Mobile 5G on Internet2.  In MX 19 the loges fill with IP conflicts.  Initialy I saw that the switch was using the same MAC address for both of the IP addresses and fixed that.  The MX 19 code would actually report the fixed IP address with the old MAC address even though the traffic captures did not back that up.     Update:  I moved the affected Apple TVs to Wi-Fi and the "DHCP Problem" went away.  Not happy I have more devices on Wi-Fi that could be on Ethernet though. Now back in MX 18.211.6 I went today to get new packet captures and the packet capture feature does not work?!?  It did work when I was on M<X 19.1 and MX 19.2 Then to add injury to insult with the release of iOS 26 some of the Apple TVs in my network now fill the log with DHCP failures.  This seems to be specific to the Apple TVs that are stereo paired with HomePods.  Meraki Support is basically saying do feature requests for all this.  The ticket is 13503021 if a Meraki developer wants to take a look? ... View more

Thanks this is the answer I was looking for.  Assuming I have no DHCP system failures in MX 19 I can probably let the USB modem go when it is time to go to MX 20...assuming MX 20 even runs on an MX-68? ... View more

I realized I was overthinking this.  I have backup WAN through 5G and the only thing I use the USB modem for is remote reboot when the DHCP fails in the Meraki.  The two failures I have had "USB Failover" would not matter as the client are losing their IP addresses as well as the WAN so there is nothing to failover when this happens.  I am guessing maybe the USB modem gets the IP address rather than the Meraki so that is why is why it still works?  IN any event as long as Meraki allows the interface to be reachable from the dashboard then it will work for my purpose. ... View more

My thought was that if the code is still there and the modem has been working then it will probably stay working until the code goes away - at least for my purpose of remote reboots.  Just trying to get a straight answer on that and nobody really seems to know one way or the other? ... View more

I am looking for someone that knows the answer to question.  You are doing what the TAC did and citing notes that have the wishy-washy wording to them. ... View more