No DNS Server setting applied using ECM mode

Cellular Modules Quectel EC25 LTE Module
1

Hi,

I recently started to use the Sixfab LTE hat in ECM for my Raspberry PI and realised that I am not receiving the DNS Server address via DHCP, consequently no name resolution is possible via the Raspberry PI. My use case relies on the LTE modem for all connectivity.

If I add the default gateway (192.168.225.1) to resolv.conf name resolution starts to work as expected, that setting is lost after reboot. I am running Debian 10.8 with a Raspberry PI 3 A+.

How can I apply the DNS server statically upon boot? or is there something missing in the ECM config that enables this setting?

Thanks,

Dustin

2

Hello,

Are you using Sixfab Core?
If yes, please share the following logs:

  • core_manager and core_agent services
  • /home/sixfab/.core/logs/agent-log
  • /home/sixfab/.core/logs/cm-log

If no, please go through the troubleshooting guide and share the results with us.

3

Hi Saeed,

I will dig them out a little later, I believe the behavior is related to the Wireless Access Point mode (for troubleshooting) that the Pi enables if it is unable to connect to the configured SSID. In this mode /etc/resolv.conf is populated with loopback address 127.0.0.1

In my scenario the Pi won’t have access to that WiFi network and instead use the Sixfab as its main internet connection.

I see two possible solutions:

  1. Somehow disable the WAP mode? Less preferred since that will be helpful for troubleshooting in the field.
  2. Somehow populate /etc/resolv.conf with persistent name server values?

By the way, what is the power consumption of the Quetcel Hat?

Thanks,

Dustin