Can ModemManager connect to multiple PDUs networks?

[Radu C]

HI,

Thank you for your answer. This works, indeed, and it is the information I
was looking for. However, I have a follow-up question:

When using the multiplex property, a virtual interface called mbimmux<modem
dbus id>.<vlan id> is created.

Is it possible to control the interface name and the VLAN ID used for this
interface? This would be useful for having a consistent/simple routing
configuration in the system. For example if the modem is being reset, the
virtual interface name will change as well. Having a predefined name for
the virtual interface might be easier.

Thank you,
Radu

On Tue, Jan 23, 2024 at 2:42 AM Bjørn Mork <bjorn at mork.no> wrote:

> Radu C <rcernea at gmail.com> writes:
>
> > Hi,
> >
> > There are multiple tutorials online on how to connect a modem to a 5G
> core
> > with multiple PDUs using mbimcli (like
> >
> https://www.kernel.org/doc/html/latest/networking/cdc_mbim.html#mbim-data-channel-userspace-abi
> ,
> > or
> >
> https://paldan.altervista.org/linux-mbim-wwan-multiple-pdn-setup/?doing_wp_cron=1705964667.8114559650421142578125
> > ).
> >
> > Essentially in mbimcli one can specify a session id, as part of the
> access
> > string. This session ID is then mapped to a VLAN ID, which is mapped to a
> > virtual interface on top of the modem network interface. In short,
> > something like this:
> >
> > ```
> > ip link add wwan0.1 link wwan0 type vlan id 1
> > ip link add wwan0.2 link wwan0 type vlan id 2
> > mbimcli -p -d /dev/cdc-wdm0 --connect=apn=apnA,session-id=1,ip-type=ipv4
> > --no-close --no-open=42
> > mbimcli -p -d /dev/cdc-wdm0 --connect=apn=apnB,session-id=2,ip-type=ipv4
> > --no-close --no-open=42
> > ```
> >
> > Is it possible to achieve the same result using mmcli, or the
> ModemManager
> > API?
>
> mmcli -m any --simple-connect=apn=apnA,multiplex=requested
> mmcli -m any --simple-connect=apn=apnB,multiplex=requested
>
> or use multiplex=required if you want mmcli to fail if unsupported
>
> Bjørn
>
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