Bearer MTU not recognised by NetworkManager

[Enrico Mioso]

Hi!!

The relevant code is in NetworkManager/src/devices/wwan . In my impression NM doesn't ask MM for the MTU, using it's own (default) values for that.
Note that it's only my impression from a superficial look.

Hence, assuming I am right, I guess this isn't a MM related issue.

Enrico


On Thu, 7 May 2020, Sven Schwermer wrote:

> Date: Thu, 7 May 2020 15:43:51
> From: Sven Schwermer <sven at svenschwermer.de>
> To: "ModemManager (development)" <modemmanager-devel at lists.freedesktop.org>
> Subject: Bearer MTU not recognised by NetworkManager
> 
> Hi,
>
> I’m observing that NetworkManager (v1.20.2) does not recognise the MTU (=1360) exposed by the ModemManager’s (v1.10.6) bearer object and instead uses some default value (=1500). This seems to lead to issues which are fixed when manually setting the MTU to a lower value. When checking the NetworkManager’s connection settings, gsm.mtu is set to “auto". I’m observing this on a Quectel BG96 hooked up via QMI. My kernel version is 4.19.87.
>
> Is this a known issue? Is anyone aware whether this is fixed upstream?
>
> Thanks,
> Sven
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