From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Fri, 26 Feb 2010 10:49:46 -0800
From: Stephen Hemminger <shemminger@linux-foundation.org>
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	<20100226.100800.116618587.davem@davemloft.net>
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Subject: Re: [Bridge] [RFC 0/5] bridge - introduce via_phys_dev feature
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To: Ben Greear <greearb@candelatech.com>
Cc: bridge@linux-foundation.org, netdev@vger.kernel.org, gorcunov@gmail.com, den@openvz.org, David Miller <davem@davemloft.net>, xemul@openvz.org

On Fri, 26 Feb 2010 10:40:46 -0800
Ben Greear <greearb@candelatech.com> wrote:

> On 02/26/2010 10:30 AM, Stephen Hemminger wrote:
> > On Fri, 26 Feb 2010 10:08:00 -0800 (PST)
> > David Miller<davem@davemloft.net>  wrote:
> >
> >> From: Stephen Hemminger<shemminger@linux-foundation.org>
> >> Date: Fri, 26 Feb 2010 10:01:02 -0800
> >>
> >>> TCP connections are never really bound to device. TCP routing is
> >>> flexible; if packets can get through, it doesn't care.
> >>
> >> I think he might be talking about SO_BINDTODEVICE
> >
> > What application does that with TCP?
> 
> I use it..helps with using multiple interfaces on the same system,
> especially when sending-to-self.
> 

That is a special case which is not related to the discussion.
We are talking about being able to setup a bridge and migrate the
associated state from the ethernet device to the bridge.