From: Vincent Bernat <bernat@luffy.cx>
To: David Miller <davem@davemloft.net>
Cc: <zenczykowski@gmail.com>, <netdev@vger.kernel.org>,
<yoshfuji@linux-ipv6.org>
Subject: Re: nonlocal_bind and IPv6
Date: Fri, 16 Dec 2011 10:53:48 +0100 [thread overview]
Message-ID: <e21a2d9682b5d83fefe3f09a07316033@luffy.cx> (raw)
In-Reply-To: <20111216.020600.1695776769736304587.davem@davemloft.net>
On Fri, 16 Dec 2011 02:06:00 -0500 (EST), David Miller wrote:
>> OoO En ce milieu de nuit étoilée du vendredi 16 décembre 2011,
>> vers
>> 04:58, Maciej Żenczykowski <zenczykowski@gmail.com> disait :
>>
>>> why not simply use the IP_TRANSPARENT or IP_FREEBIND socket
>>> options?
>>
>> Because this requires modifying each affected software. This
>> can be
>> difficult if you don't have the source code available.
>
> But it means that it would work on every single kernel verion out
> there.
Sure. But... The typical scenario for this setting is when you are
using something like VRRP. You have your web server running on several
nodes and only one of them has the appropriate IP address at the given
moment. Moreover, you have to bind to specific IP and not 0.0.0.0 for
other reasons (for example, when using several SSL virtualhosts).
Starting the web server only when a node gets the appropriate IP is not
possible because it increases downtime. Since this VRRP stuff is related
to system configuration, it seems sensible to have a system setting
equivalent to IP_FREEBIND socket options. This is ip_nonlocal_bind.
Moreover, I am just adding the IPv6 version of this setting. The IPv4
version already exists.
next prev parent reply other threads:[~2011-12-16 9:53 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-14 16:20 nonlocal_bind and IPv6 Vincent Bernat
2011-12-14 16:20 ` [PATCH 1/2] net/ipv6: add ip_nonlocal_bind sysctl for IPv6 Vincent Bernat
2011-12-14 16:20 ` [PATCH 2/2] net/ipv4: bind ip_nonlocal_bind to current netns Vincent Bernat
2011-12-16 3:58 ` nonlocal_bind and IPv6 Maciej Żenczykowski
2011-12-16 6:24 ` Vincent Bernat
2011-12-16 7:06 ` David Miller
2011-12-16 9:53 ` Vincent Bernat [this message]
2011-12-16 11:10 ` Francois Romieu
2011-12-16 18:20 ` David Miller
2011-12-16 18:18 ` David Miller
2011-12-17 10:52 ` Vincent Bernat
2011-12-16 6:46 ` YOSHIFUJI Hideaki
2011-12-16 9:46 ` Vincent Bernat
-- strict thread matches above, loose matches on Subject: below --
2011-12-12 13:18 Vincent Bernat
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