Hey all, I wrote a doc explaining how IPv4/IPv6 connectivity in LTE networks is setup (a very basic case scenario), including different possible interactions between host, modem and network, and focusing on how all these are exposed by ModemManager.
It has been very useful for me to understand different IPv6 SLAAC scenarios that we have seen with different modem types, so I'm sure it will also be useful for others. Please take a look and report errors if any! https://modemmanager.org/docs/modemmanager/ip-connectivity-setup-in-lte-modems/ -- Aleksander