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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v2] Implement IP_UNICAST_IF socket option.
Date: Thu, 02 Feb 2012 20:50:44 -0500 (EST)
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From: Xiaochun Lu <xiaoclu@gmail.com>
Date: Thu, 2 Feb 2012 17:19:11 -0800

> Hi, Erich E. Hoover:
> 
> Can you give more detail on why we need invent another binding to
> device option in your patch log?  Why SO_BINDTODEVICE or IP_PKTINFO
> can't server your need?

Windows apps via wine will make use of this, and you can't just use
bind()'ing or IP_PKTINFO because the former doesn't work on broadcast
addreses and the latter might be used by the wine application at the
same time as IP_UNICAST_IF.

He explained this fully in his previous patch discussion, DO NOT repeat
this whole discussion it's a waste of time.