Hi, As regards the following item: In rare cases, MX67C, MX68CW, and Z3C appliances may fail to enter into a "Ready" state despite being able to register to a cellular network and obtain an IP address for the modem. Seems it may also need to include Z4C's as well, as seems to have been allocated IPv4 and IPv6 addresses, but not showing as Ready: Seems to be up, but not really 100% sure. ... View more

I may have found out something about the 1:1 NAT.  Apparently the 1:1 NAT will not even try to work if the destination is not in the ARP table of the Meraki.  And, in my case the destination device didn't seem to fill the ARP table in my short testing window.  After trying another destination device, it started working about 24 hours where it did not initially upon setup.  Very strange it takes so long to update the ARP table. ... View more