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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Sun, 14 May 2017 01:17:53 +0200
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Subject: Re: TX counters not updated on wireguard interface
To: Baptiste Jonglez <baptiste@bitsofnetworks.org>
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Okay I figured it out. Upstream
039f50629b7f860f36644ed1f34b27da9aa62f43 only came in 4.5, so explicit
calls to iptunnel_xmit_stats is required. I'll play with this and see
if I can fix it.

Jason