No DNS resolving in LTE-M network

Mario

Hi,
I’m using an EVK-R510M8S (evaluation kit for SARA-R510M8S).
Registration to the network seems to work. I got an IP address and can ping IP addresses. But I got no DNS server addresses so that DNS resolving doesn’t work:
AT+UPSDA=0,3
OK
+UUPSDA: 0,“10.213.137.2”

at+cgcontrdp=1
+CGCONTRDP: 1,5,“iot.telekom.net.MNC040.MCC901.GPRS”,“10.213.137.2.255.0.0.0”,“10.0.0.1”,“”,“”,“”,“”,0,0,1500,0,0
OK

AT+UPING=“8.8.8.8”
OK
+UUPING: 1,32,“”,“8.8.8.8”,53,304
+UUPING: 2,32,“”,“8.8.8.8”,53,60
+UUPING: 3,32,“”,“8.8.8.8”,53,60
+UUPING: 4,32,“”,“8.8.8.8”,53,54

AT+UPING=“www.google.com”
OK
+UUPINGER: 8

AT+UDNSRN=0,“www.google.com”
ERROR

What need to be changed in the setting?

BR
Mario

fm

Hello @mario

the pinger error 8 you are seeing means no DNS server have been set.

Looking at the at commands for the SARA-R5 module and the response you posted for the at+cgcontrdp=1 command it looks like ip addresses for primary and secondary DNS are missing.

+CGCONTRDP: 1,5,“iot.telekom.net.MNC040.MCC901.GPRS”,“10.213.137.2.255.0.0.0”,“10.0.0.1”,“”,“”,“”,“”,0,0,1500,0,0

The three IP addresses which are returned are IP, mask and gateway. However the next two entries (primary and secondary DNS) are empty strings.

The only command I’ve seen in the at command list to set DNS ip adress is AT+UPSD. If that is the correct command and how to use it I cannot say as I don’t have that particular modem to test myself.

Hopefully somebody more knowledgeable can help you with that.

Thanks
Felix