netdev - Re: [PATCH net] bridge: allow receiption on disabled port

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Date:	Thu, 10 Oct 2013 13:36:46 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Felix Fietkau <nbd@...nwrt.org>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net] bridge: allow receiption on disabled port

On Thu, 10 Oct 2013 14:52:50 +0200
Felix Fietkau <nbd@...nwrt.org> wrote:

> When an ethernet device is enslaved to a bridge, and the bridge STP
> detects loss of carrier (or operational state down), then normally
> packet receiption is blocked.
> 
> This breaks control applications like WPA which maybe expecting to
> receive packets to negotiate to bring link up. The bridge needs to
> block forwarding packets from these disabled ports, but there is no
> hard requirement to not allow local packet delivery.
> 
> Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
> Signed-off-by: Felix Fietkau <nbd@...nwrt.org>

No. This will cause duplicate packets to be delivered.

If doing a link layer protocol like WPA then it should be done directly
on the underlying device, not the bridge itself.
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