DNS configuration on MLinux

[Thierry Schneider]

Hi,
I would like to forward LoRa messages to iot.semtech.com but it seem the DNS function is not working in the Multitech Conduit.

How can I enable it ?

Thanks
Thierry

[Jeff Hatch]

Thierry,

If you have a cellular radio and a SIM card installed, once cellular is enabled and ppp is up and running you should have DNS working. If you don’t have a cellular radio and/or SIM card, in the UI you can go to Setup->Network Interfaces, select the eth0 interface and set DNS and gateway settings.

Jeff

[Jeff Hatch]

Thierry,

Sorry, I thought you were running an AEP model Conduit. To set up the DNS on the mLinux model, if you have a cellular radio and SIM card, you can set up ppp with the instructions at:

Start Cell Connection on Boot

If you don’t have a cellular radio and/or SIM card, you can update the /etc/network/interfaces file to configure the eth0 with an entry like:

# Wired interface
auto eth0
iface eth0 inet static
address 192.168.2.100
gateway 192.168.2.1
netmask 255.255.255.0

Jeff

[Thierry Schneider]

Hi Jeff,

Thank you for the answer. Unfortunately this specifies the IP address and routing but it doesn’s active DNS

Best regards
Thierry

[Jeff Hatch]

Thierry,

For DNS you should be able to add the dns nameservers:

# Wired interface
auto eth0
iface eth0 inet static
address 192.168.2.100
gateway 192.168.2.1
dns-nameservers 12.34.56.78 12.34.56.79
netmask 255.255.255.0

Jeff

[Thierry Schneider]

Hi Jeff,

Here is the content of my interfaces configuration file
The DNS is not working.
When I make
ping http://www.google.com
ping: unknown host http://www.google.com

# /etc/network/interfaces — configuration file for ifup(8), ifdown(8)

# The loopback interface
auto lo
iface lo inet loopback

# Wired interface
auto eth0
iface eth0 inet static
address 192.168.1.254
netmask 255.255.255.0
network 192.168.1.1
broadcast 192.168.0.255
post-up route add -net 0.0.0.0 netmask 0.0.0.0 gw 192.168.1.1
dns-nameservers 8.8.8.8 194.230.55.99

[Jeff Hatch]

Thierry,

Is ppp running and is there a ppp interface instantiated? Second, can you ping 8.8.8.8 or 194.230.55.99? I don’t see a gateway specified in your configuration, so I can’t tell whether the device has any routes to get to the nameservers.

Jeff

[Jeff Hatch]

I see the “post-up route add”, but am not sure how that works, especially with the unspecified addresses for the net and netmask.

Jeff

[Thierry Schneider]

ping 8.8.8.8 is working
I have no task named ppp or pppd

I’m connected to the internet through a direct ETH connection

Thierry

[Jason Reiss]

If you edit /etc/resolv.conf and add your dns servers there

nameserver 8.8.8.8

The resolv.conf file will be reset on reboot so you will have to change the file again.

It seems the dns-nameservers line in /etc/network/interfaces is not being applied on startup.

[Bryan Tran]

Hi Thierry,

Try this and see if it helps?

Remove this line: dns-nameservers 8.8.8.8 194.230.55.99

Add these lines: post-up echo “nameserver 8.8.8.8″ > /etc/resolv.conf
post-up echo “nameserver 194.230.55.99″ >> /etc/resolv.conf

Thanks,

BT

[Bryan Tran]

Hi Thierry,

Also, when you issue the ping – omit the http:// – Try do like: ping http://www.google.com from the Conduit.

Thanks,

BT

[Jason Reiss]

That worked for me Bryan, thanks.

Just do not copy and paste from the post as the quotes are not “quotes”.

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