Hey,
> > 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 :/ -- Aleksander https://aleksander.es
