[OpenWrt-Devel] ramips/mt7621 after 5.4 switch

Andre Valentin avalentin at marcant.net
Fri Apr 10 04:47:58 EDT 2020


Am 07.04.20 um 17:49 schrieb Bjørn Mork:
> Just remembered an issue on my todo list: There have been some MTU
> handling changes in the kernel networking API.  This affected the
> qmi_wwan QMAP handling.  I am not sure about the current status.  Will
> have to dig a bit more.  But this might be your problem.

That made me set MTU of wwan0 to 1600, and the qmimux* to 1500. No more problems anymore.
This should go into documentation, not that anybody makes the same errors. How much overhead
does qmux create (for correct calculated MTU offset)?

Thanks you!
Kind regards,


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