Re: 4.16 issue with mbim modem and ping with size > 14552 bytes

Hi Greg,

2018-05-24 17:53 GMT+02:00 Greg KH [off-list ref]:

On Thu, May 24, 2018 at 05:04:49PM +0200, Daniele Palmas wrote:

quoted

Hello,

I have an issue with an USB mbim modem when trying to send with ping
more than 14552 bytes: it looks like to me a kernel issue, but not at
the cdc_mbim or cdc_ncm level, anyway not sure, so I'm reporting the
issue.

My kernel is 4.16. The device is the following:

Does older kernels work, or is this something that has always been
there?

Not tested yet, I'm going to do.

I ask, as my mobile provider does horrible things to large packet sizes.
So much so that I have to set the mtu to 1280 just to get things to work
properly when tethering my phone through to my laptop.  So this might be
a network provider issue :)

Yeah, I thought the same, so I tried the same scenario with Windows 10
but it is working fine.

Thanks,
Daniele

thanks,

greg k-h