Help in establishing multiple simultaneous APNs: nmcli and multiple connection keyfiles

[Riff Rafferty]

>
> >
> > I attempted to use mmcli 1.18.6 and nmcli 1.36.0 with network manager
> and keyfiles to create multiple simultaneous connections to two different
> APNs with a USB cellular modem on an Ubuntu Jammy Jellyfish 22.04 system.
> The ModemManager.service file had the debug and test-multiplex-requested
> options activated on the ExecStart line.
> >
> > Short summary of results:
> >
> > This sequence of commands (sudo nmcli con reload, sudo nmcli --wait 300
> con up id conn1,  sudo nmcli --wait 300 con up id conn2) did not produce
> multiple simultaneous packet data network connections, but rather the
> second connection displaced the first.
> >
>
> Hum... you are right here, and I think I totally mixed it.
> NetworkManager probably runs an explicit disconnect of all bearers in
> the modem before attempting a new connection. Something to improve in
> NM I'd say, we may need NM also to know about the multiplex needs of a
> given device, and allow having multiple connections over the same
> single device. When I tested all this a while ago, I used NM for
> testing, but all those tests were checking the complex process of
> getting one multiplexed connection up, not more than one :) When
> testing and validating multiple multiplexed connections I used a
> different small tester program that used MM APIs directly.
>
> So, yes, for testing all this you should probably play with mmcli and
> manual IP/route settings setup :/
>
>
Any idea when Network Manager might be changed as described above? In 2
weeks, 2 months, or 2 years?

Thanks to Aleksander for his responses to my inquiries. Much appreciated.

-Riff
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