netdev - Is there any necessary to add multicast route for a loopback device?

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Message-ID: <4ED5DD7D.10908@cn.fujitsu.com>
Date:	Wed, 30 Nov 2011 15:38:37 +0800
From:	Li Wei <lw@...fujitsu.com>
To:	netdev <netdev@...r.kernel.org>
Subject: Is there any necessary to add multicast route for a loopback device?

Hi all,

I found that since Fedora 15, it use systemd as the 'init'. When systemd start 
it would config the ipv6 address(::1/128) for 'lo' and start it. While adding 
this address to 'lo', kernel will call addrconf_add_mroute() to set a multicast
route for 'lo' with rt->dst.error = -ENETUNREACH. After that, when I send multi-
cast message, the route subsystem return a route with .error set to NETUNREACH.

Is there any necessary to add multicast route for a loopback device? 

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