netdev - Re: ping6 ff02::1 on eth0 shows echo reply on lo

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Message-Id: <20080610.124211.63104092.davem@davemloft.net>
Date:	Tue, 10 Jun 2008 12:42:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	chasedouglas@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: ping6 ff02::1 on eth0 shows echo reply on lo

From: Chase Douglas <chasedouglas@...il.com>
Date: Tue, 10 Jun 2008 15:32:34 -0400

> While doing some testing, I've found that a ping request sent only on  
> eth0 to link-local addresses (ping6 -I eth0 ff02::1) is causing lo to  
> generate echo replies. Is this intended behavior or a bug somewhere?

Intended behavior.

When the kernel knows it's for the local machine, even if the address
is attached to a physical device, it routes the packet over loopback.
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