From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH iproute2] ip/l2tp: remove offset and peer-offset options
Date: Wed, 4 Apr 2018 16:43:10 -0700
Message-ID: <20180404164310.43259e82@xeon-e3>
References: <46d360e852235de84e44c796fa934f9cfce988b1.1522769819.git.g.nault@alphalink.fr>
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Cc: netdev@vger.kernel.org, James Chapman <jchapman@katalix.com>
To: Guillaume Nault <g.nault@alphalink.fr>
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On Tue, 3 Apr 2018 17:39:54 +0200
Guillaume Nault <g.nault@alphalink.fr> wrote:

> Ignore options "peer-offset" and "offset" when creating sessions. Keep
> them when dumping sessions in order to avoid breaking external scripts.
> 
> "peer-offset" has always been a noop in iproute2. "offset" is now
> ignored in Linux 4.16 (and was broken before that).
> 
> Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>

Sure, this makes sense applied.
In theory, you could have just dropped them from the JSON output.