Bearer MTU not recognised by NetworkManager

[Sven Schwermer]

Just a follow-up: A fix has been merged to NetworkManager upstream: https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/499 <https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/499>

> On 7 May 2020, at 16:14, Enrico Mioso <mrkiko.rs at gmail.com> wrote:
> 
> 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
>> _______________________________________________
>> ModemManager-devel mailing list
>> ModemManager-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel

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