title: No internet through GSM connection, possible interface issue
body: <p>I have a problem with getting GSM connection to work.</p>
  
  <p>Currently used:</p>
  
  <ul>
  <li>Advantech UNO-2272G device</li>
  <li>Ubuntu 18.04</li>
  <li>NetworkManager/nmcli package</li>
  </ul>
  
  <p>The card works when put in a mobile phone.</p>
  
  <p>*Note: following screenshots are made over SSH and remotely, as the device is currently plugged in ethernet until this issue is resolved.</p>
  
  <p>This is current state of "nmcli" command:</p>
  
  <p><a href="https://i.stack.imgur.com/d1wWY.png" rel="nofollow noreferrer">nmcli print</a></p>
  
  <p>The system connection for GSM is called "radi". My guess is that somehow the interface of that connection is trying to work with the other interface (underlined in red), which in turn is trying to get its DNS conf from router (to which it currently is connected with ethernet, but nothing changes if device is plugged out from router and NetworkManager and network is restarted, it still tries to get to router for its DNS).</p>
  
  <p>This is current state of "ip addr" command:</p>
  
  <p><a href="https://i.stack.imgur.com/A7jpE.png" rel="nofollow noreferrer">ip addr</a></p>
  
  <p>This is current state of /etc/network/interfaces file:</p>
  
  <p><a href="https://i.stack.imgur.com/u9yqg.png" rel="nofollow noreferrer">interfaces</a></p>
  
  <p>This is current state of /etc/NetworkManager/system-connections/radi file:</p>
  
  <p><a href="https://i.stack.imgur.com/38M4L.png" rel="nofollow noreferrer">systemconnection</a></p>
  
  <p>So, the question is, what am I missing here? Is it the interface issue as written above, or something else entirely?</p>
  
  <p>Disclaimer: I am not that proficient in the stuff presented here, most if not all of it was configured following guidelines on the internet.</p>