netdev - Re: [PATCH 0/2] bring UP loopback device at initialziation

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Message-ID: <CAM_iQpW-Z8jsK_kSMkqUKY-aVr01nAf6V8HzSdxCzGTaNru2yQ@mail.gmail.com>
Date:   Thu, 6 Jul 2017 11:40:34 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Mahesh Bandewar (महेश बंडेवार) 
        <maheshb@...gle.com>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        David Miller <davem@...emloft.net>,
        Mahesh Bandewar <mahesh@...dewar.net>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Patrick McHardy <kaber@...sh.net>,
        Eric Dumazet <edumazet@...gle.com>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 0/2] bring UP loopback device at initialziation

On Wed, Jul 5, 2017 at 4:01 PM, Mahesh Bandewar (महेश बंडेवार)
<maheshb@...gle.com> wrote:
>
> Now that you have made me aware of some use cases that do want the
> loopback device to be DOWN, could we use a global sysctl to dictate
> the loopback behavior during init? e.g.

Yeah, it is never about which way is better, it is all about if we could break
the existing assumption. This is a similar situation to the
inconsistent behavior
of the per-netns sysctl's between IPv4 and IPv6, there were multiple fixes
or complains about it in this mailing list, but we still don't change it yet.