Hi There,
I have been running multiple RG500QGLs for quite some time now as backup-lines on branch-sites for the company I am working at. At the moment the modules are located within the cabinet inside the building and external antennas on the other side of the wall. They are connected via USB3.
For easier and cheaper installation and better reception I’m testing a PoE-driven M.2 to Ethernet-Adapter which could be located outside the building. Everything is working apart from AT-Commands over Ethernet, which is needed for monitoring reasons (especially AT+QTEMP).
The modules have imho the newest firmware:
AT+QGMR
RM500QGLABR13A03M4G_01.202.01.202
The configuration of the modules is as follows:
ATH
AT+CFUN=0
! Set Data-Interface to PCIe
AT+QCFG="data_interface",1,0
! Set PCIe-Mode to RootComplex
AT+QCFG="pcie/mode",1
! Set ETH-driver for RGMII to RTL8125G
AT+QETH="eth_driver","r8125",1
! Enable RMGII
AT+QETH="rgmii","enable",1,0
! Need reload
AT+CFUN=1,1
ATH
AT+CFUN=0
! Enable AT-Commands on TCP Port 1555
AT+QETH="eth_at","enable"
! Set APNs
AT+CGDCONT=1,"IP","internet.t-d1.de"
AT+CGDCONT=5,"IPV6","internet.v6.telekom"
AT&W
! Add VLAN for MultiPDN Setting
AT+QMAP="vlan",51,"enable",1
! automatic reload
ATH
AT+CFUN=0
! Enable IP-Passthrough
AT+QMAP="ippt_nat",1
! IPv4 APN is native on the interface
AT+QMAP="mPDN_rule",0
AT+QMAP="MPDN_rule",0,1,0,1,1,"FF:FF:FF:FF:FF:FF"
! IPv6 APN is dot1q-tagged in VLAN 51
AT+QMAP="MPDN_rule",1
AT+QMAP="MPDN_rule",1,5,51,1,1,"FF:FF:FF:FF:FF:FF"
!
AT&W
AT+CFUN=1,1
I have one interface on the native VLAN with DCHP enabled, which is getting the public IP and a second virtual one configured statically to 192.168.225.200/24. I am able to ping 192.168.225.1, but if I try to connect to port 1555 on 192.168.225.1 I always recieve a TCP-Reset 
Is there anything I did wrong or I can do to get eth_at working?
Thanks in advance for any help!
Sebastian