netdev - Re: nonlocal

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Date:	Fri, 16 Dec 2011 10:53:48 +0100
From:	Vincent Bernat <bernat@...fy.cx>
To:	David Miller <davem@...emloft.net>
Cc:	<zenczykowski@...il.com>, <netdev@...r.kernel.org>,
	<yoshfuji@...ux-ipv6.org>
Subject: Re: nonlocal_bind and IPv6

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@...il.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.
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