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

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Message-ID: <4ED6E6A8.3080702@cn.fujitsu.com>
Date:	Thu, 01 Dec 2011 10:30:00 +0800
From:	Li Wei <lw@...fujitsu.com>
To:	"David S. Miller" <davem@...emloft.net>
CC:	netdev <netdev@...r.kernel.org>
Subject: Re: Is there any necessary to add multicast route for a loopback
 device?

Hi David,

what's your opinion?

> 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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