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Date:   Sat, 21 Nov 2020 14:03:11 -0800
From:   Jakub Kicinski <>
To:     Yves-Alexis Perez <>
Cc:     "David S. Miller" <>,
        Martin Habets <>,
        Luc Van Oostenryck <>,
        Shannon Nelson <>,
        "Michael S. Tsirkin" <>,,,,
        Matti Vuorela <>,
Subject: Re: [PATCH] usbnet: ipheth: fix connectivity with iOS 14

On Thu, 19 Nov 2020 18:24:39 +0100 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
> 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:

Applied to net with the typo fixed, thanks!

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