[systemd-devel] Mobile broadband modems support in systemd-networkd

[Bruce A. Johnson]

I wasn't clear what I meant about processing of the .network file. With 
Ethernet or Wi-Fi (using iwd), when the link comes up, systemd-networkd 
does the Right Thing and starts network services on the interface, 
running a DHCP client or setting up static address(es), routes, etc., as 
specified in the .network file. When ModemManager establishes the 
connection with the 3G carrier, systemd-networkd seems to be unaware of 
the event, and I have to poke it with "systemd restart systemd-networkd" 
or "networkctl reload" before it tries to use the information in the 
.network file for the interface. It seems to me like that ought to 
happen automatically. I suspect that ModemManager needs to be changed to 
inform systemd-networkd.

So far, it's not looking like there's an effort to integrate 
ModemManager (or something similar) with systemd-networkd, which is kind 
of a shame. If I come up with anything useful toward making that happen, 
I'll offer a pull request, but at the moment I'm looking at cobbling 
something together with Python.

Bruce A. Johnson | Firmware Engineer
Blue Ridge Networks, Inc.
14120 Parke Long Court Suite 103 | Chantilly, VA 20151
Main: 1.800.722.1168 | Direct: 703-633-7332
http://www.blueridgenetworks.com
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On 23/08/2021 16:11, Manuel Wagesreither wrote:
>> I took a closer look at what's going on with systemd-networkd, and I
>> found whether I use ModemManager or mbim-cli to connect to the mobile
>> network, the .network file will be processed, but _only after I restart
>> systemd-networkd_.
> I'm not 100% sure this applies to all the applications in the systemd ecosystem (like systemd-networkd), but systemd is reloading .unit, .service, .mount and all the other files there are only after a `systemctl daemon-reload`. That's the intended behaviour. Just wanted to mention this. Can't comment on anything else, though, as I have no clue either. But I'm interested in this topic and am silently monitoring this thread.
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