<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> I think what confused me is that without the ModemManager i.e. using just cgact=1,1 to manually connect, i suddenly got an ip address assigned to the network interface provided by the modem. I thought it was NetworkManager running its dhcp client on that interface after getting a dhcp discover ? from the modem ? (i'm not too sure about how dhcp goes about its business) Anyway i have now tried to use Network Manager to setup and connect but now am getting the following message: modem-broadband[ttyUSB0]: failed to connect 'meig': Connection requested both IPv4 and IPv6 but dual-stack addressing is unsupported by the modem. and disabling ipv6 I get: failed to connect 'meig': Connection requested IPv4 but IPv4 is unsupported by the modem. Any idea where to start debugging that ? <div class="moz-cite-prefix">On 2/14/24 11:24, Aleksander Morgado wrote: </div> <blockquote type="cite" cite="mid:CAAFgFrUx4DYr-b4mcYNnJWs6q3ykn5nrT-ow+5pRZGEYDETUNA@mail.gmail.com"> <pre class="moz-quote-pre" wrap="">Hey! On Tue, Feb 13, 2024 at 1:49 PM Garfield Watkins <a class="moz-txt-link-rfc2396E" href="mailto:garfield.watkins@gmail.com"><garfield.watkins@gmail.com></a> wrote: </pre> <blockquote type="cite"> <pre class="moz-quote-pre" wrap=""> Did you connect the modem using NetworkManager (e.g. using nmcli) or did you connect the modem using mmcli? I see where you are going with this. It seems I expected more of the interaction between the ModemManager and Network Manager . To answer your question, no I have only used mmcli. Let me try the process with nmcli. </pre> </blockquote> <pre class="moz-quote-pre" wrap=""> :) NM only processes the connections that have been started via NM. There's a fundamental reason for that, which is that all the network-specific routing is done at NM level, MM knows nothing about it. In order for NM to know how to route traffic to through the LTE connection, it needs to use its own connection settings. </pre> </blockquote> </body> </html>