Static vs DHCP setups from ModemManager in OpenWrt

[Enrico Mioso]

Hello!!

This is modem firmware-dependent: the modem decides how to present the configuration to you.
This is what I understood at least.


On Mon, 12 Jul 2021, Peter Naulls wrote:

> Date: Mon, 12 Jul 2021 14:19:04
> From: Peter Naulls <peter at chocky.org>
> To: modemmanager-devel at lists.freedesktop.org
> Subject: Static vs DHCP setups from ModemManager in OpenWrt
> 
>
> Hello all.
>
> I'm using ModemManger 1.16.6 on OpenWrt along with its scripts (and slight 
> modifications so it doesn't just give up in the end).
>
> After a lot of testing and loss of connectivity, it seems that although
> our provider is offering DHCP, the connection via ModemManager is configured
> statically. This leads to loss of connection after several hours unless
> intervention is taken such as manual DHCP or re-configuring the interface.
>
> We can see here:
>
> # mmcli --modem 0 --bearer=1 --output-keyvalue | grep ipv4
> bearer.properties.ip-type       : ipv4v6
> bearer.ipv4-config.method       : static
> bearer.ipv4-config.address      : 10.246.110.163
> bearer.ipv4-config.prefix       : 29
> bearer.ipv4-config.gateway      : 10.246.110.164
> bearer.ipv4-config.dns.length   : 1
> bearer.ipv4-config.dns.value[1] : 107.112.229.135
> bearer.ipv4-config.mtu          : 1430
>
> So the question is, is this a ModemManager bug? Or is it misreporting
> from the carrier, or something else?  What can I do to debug this?
>
> Thanks!
>
>
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