netdev - Re: [Bug 194723] connect() to localhost stalls after 4.9 -> 4.10 upgrade

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Date:   Wed, 15 Mar 2017 15:30:17 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     stephen@...workplumber.org, netdev@...r.kernel.org
Subject: Re: [Bug 194723] connect() to localhost stalls after 4.9 -> 4.10
 upgrade

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 15 Mar 2017 14:40:34 -0700

> Finally time to get rid of buggy tw_recycle, that apparently some
> distros set to one.

It's not buggy, it's just not designed in a way that it can work in
the presence of NAT.

So yes, indeed, NO DISTRO SHOULD CHANGE THE VALUE TO "1" by default.

Is CentOS the only culprit?

But removing it is unnecessary, people who know what they are doing
can legitimately enable it if they know that there is no NAT going
on in their paths.