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From: David Miller <davem@davemloft.net>
Subject: Re: [net-next PATCH 0/2] GENEVE/VXLAN: Enable outer Tx checksum by
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Date: Tue, 23 Feb 2016 13:24:58 -0500 (EST)
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From: Jesse Gross <jesse@kernel.org>
Date: Tue, 23 Feb 2016 09:31:09 -0800

> Most OSs (including Linux with connected TCP sockets) use non-zero IP
> IDs so requiring this would effectively disable GRO.

+1

Any OS that wants to work with SLHC, as I mentioned, has to emit
monotonically increasing IP ID values in all packets, even those with
DF set.