Nordic Border Router suddenly stopped working

[Brian (Geek)]

Hello,

I am currently using Nordic border router image as suggested by Google open thread group as i am using NRF5 SDK examples (sleepy mqttsn-publish example to be precise). The issue which i am facing after using the border router for 1 month continuously, suddenly my otbr has stopped acknowledging the packet send by the end device. 

I can see that the MQTT-SN gateway is acknowledging in Rpi system logs but that acknowledge is unable to reach my end device. Here is the system log for the same. please help  me .... 

Image of the issue  : 

- as you can see there is some conflict between wpan0 and wlan0 

Can anyone please help me ?

[Sigurd Hellesvik]

Hi Brian

Thank you for reporting this. I suspect it is a bug, and will inform our developers.

As a workaround, I suggest that you make the Border Router rerun dhcpcd after you detect the error.

Regards,
Sigurd Hellesvik

[Brian (Geek)]

Okay is that a dhcpcd error ? 

As i have less knowledge of networking , i would like to know will restarting dhcpd service  solve that ? 

[Sigurd Hellesvik]

Hi

The error message in your image is tagged "dhcpcd[1945]", so my guess is that this is a dhcpcd error.

I suspect that the Raspberry Pi runs dhcpcd regularly. And by chance, it tried to give the same address to wlan0 and wpan0 when it crashed.

To test if this will happen every time dhcpcd is run, or if it opnly happens if unluckt, try to run "dhcpcd" from your Raspberry Pi command line and check the error logs after. Do this several times.

Regards,
Sigurd Hellesvik

[Brian (Geek)]

Sigurd Hellesvik said:

To test if this will happen every time dhcpcd is run, or if it opnly happens if unluckt, try to run "dhcpcd" from your Raspberry Pi command line and check the error logs after. Do this several times.

okay thanks i will let you know after checking.  

[Brian (Geek)]

Hello suddenly the same issue has arrived again.

OTBR dhcpcd[1099]: wpan0: IAID conflicts with one assigned to wlan0

I have  stopped and started the dhcpd service in RPI still it gives the same issue.

How to resolve ?

[Sigurd Hellesvik]

Hi,

See the arch wiki on DHCP Client Identifier.

Try to statically set iaid in /etc/dhcpcd.conf

Regards,
Sigurd Hellesvik