Can EG912U in ECM or RNDIS avoid using NAT?

IoT Modules LTE Standard Module
1

The EG912U AT command manual claims the AT+QCFG=“nat/cid” command can enable or disable use of NAT for particular PDP contexts. However:

AT+QCFG="nat/cid",0
AT+CGACT=1,1

still results in DHCP advertising the module’s NAT’ed IP address of 192.168.1.4
Is there some way to disable NAT?

Also, the AT+QCFG=“nat/subnet” command is supposed to allow one to assign the address the of the modem when using NAT. However, I cannot seem to get the syntax right:

AT+CMEE=2
OK
AT+QCFG="nat/cid",1
OK
AT+QCFG="nat/subnet",1
OK
AT+QCFG="nat/subnet",1,"192.168.12.4","255.255.255.0"
+CME ERROR: parameters are invalid

Can anyone provide a working example of setting the nat/subnet?

Refering to doc:
EC200U&EG800G&EG91xU&EG915G Series AT Commands Manual
Version 1.2 dated 2024-07-29

2

Which firmware version did you arrange the test? Then I will check locally and let you know.

3

I had been using the QuecPython firmware, without realizing that it removed support for many of the documented AT commands. Why is the QuecPhython firmware available for download while the standard firmware must be emailed to individual customers?
Anyway, I did receive the standard firmware, which has the support for bridge mode, etc.

The remaining problem for me is that the EG912U does not remain connected to Verizon in the USA. It works for a few minutes, then the module seems to reset. Is this a known problem?