I've set up an IPSEC L2TP link so that I can get a remote LTE router VPNing back to another router so that the remote device can be logged into (damn you CGNAT, damn you to hell). This isn't the best solution I was hoping for ... is anyone providing a private IP on mobile data? Would prefer to be hosting the VPN at the remote device to remove the need for the remote device to be always connected back home.
Ps, using the Mikrotik LtAP.
It's possible to create a script that initiates the VPN connection when sent a specific SMS message to save it being connected 24/7 but don't want to be adding more steps.
Vodafone used to offer a direct.vodafone.net.nz apn but don't think this works. There's these threads but times have changed.