[Networkmanager] Multiple connections for the same device

[Fabio Porcedda]

Il giorno mar 11 lug 2023 alle ore 08:48 Jan Lübbe
<jlu at pengutronix.de> ha scritto:
>
> On Tue, 2023-07-11 at 08:19 +0200, Fabio Porcedda wrote:
> > > > > > > I mean gsm type device. I would like to activate multiple connection profiles for the same gsm device at the same time.
> > > > > > > Sometimes it is useful to have multiple active  apn for the same broadband device enabled at the same time because each apn can have different capabilities.
> > >
> > >
> > > Good luck - the "modems" do not have the capability to connect to more than a single APN simultaneously with a multi-APN device (shich I know of none).
> >
> > Modems do have this kind of capability, for example It's possible using ModemManager with a modem that support MBIM or QMI, e.g.:
> >
> > mmcli -m <modem_id> --create-bearer="apn=<apn1>,multiplex=required"
> > mmcli -m <modem_id> --create-bearer="apn=<apn2>,multiplex=required"
> >
> > mmcli -m <modem_id> -b <bearer1_id> --connect
> > mmcli -m <modem_id> -b <bearer1_id>
> > ip addr add <bearer1_adddres>/<bearer1_prefix> dev <bearer1_interface>
> > ip link set <bearer1_interface> up
> > ip route add <bearer1_network>/<prefix> dev <bearer1_interface>
> >
> > mmcli -m <modem_id> -b <bearer2_id> --connect
> > mmcli -m <modem_id> -b <bearer2_id>
> > ip addr add <bearer2_adddres>/<prefix> dev <bearer2_interface>
> > ip link set <bearer2_interface> up
> > ip route add <bearer2_network>/<prefix> dev <bearer2_interface>
>
> This seems like it could be represented in NM as a separate device that can be
> created on demand. Existing examples of this are MACsec, macvlan and VLAN. They
> would have the modem device as parent and have their own connection.

Thanks for the info, I will look into it.

Regards
-- 
Fabio Porcedda