[OpenWrt-Devel] ramips/mt7621 after 5.4 switch

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


Hi!

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,

André

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