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Date:   Fri, 20 Nov 2020 12:15:24 +0300
From:   Sergei Shtylyov <>
To:     Yves-Alexis Perez <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        Martin Habets <>,
        Luc Van Oostenryck <>,
        Shannon Nelson <>,
        "Michael S. Tsirkin" <>,,,
Cc:     Matti Vuorela <>,
Subject: Re: [PATCH] usbnet: ipheth: fix connectivity with iOS 14


On 19.11.2020 20:24, Yves-Alexis Perez wrote:

> Starting with iOS 14 released in September 2020, connectivity using the
> personal hotspot USB tethering function of iOS devices is broken.
> Communication between the host and the device (for example ICMP traffic
> or DNS resolution using the DNS service running in the device itself)
> works fine, but communication to endpoints further away doesn't work.
> Investigation on the matter shows that UDP and ICMP traffic from the
                                         ^ "no" missing?

> tethered host is reaching the Internet at all. For TCP traffic there are
> exchanges between tethered host and server but packets are modified in
> transit leading to impossible communication.
> After some trials Matti Vuorela discovered that reducing the URB buffer
> size by two bytes restored the previous behavior. While a better
> solution might exist to fix the issue, since the protocol is not
> publicly documented and considering the small size of the fix, let's do
> that.
> Tested-by: Matti Vuorela <>
> Signed-off-by: Yves-Alexis Perez <>
> Link:
> Link:
> Cc:

MBR, Sergei

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