Subject: Re: [PATCH] IGMP: Inhibit reports for local multicast groups

From: Andrew Lunn <[email-masked]>
Date: Thu, 13 Aug 2015 18:06:26 +0200

On Thu, Aug 13, 2015 at 02:48:23PM +0000, Philip Downey wrote:
> Hi David
> Thanks for taking the time to review and comment.
> This is my first upstream request so please forgive any ignorance on my part.   I have added a new proposed commit wording below with a view to agreeing the content before resubmitting the patch.
> I hope it is sufficient to address your concerns.
> 
>    IGMP: Inhibit reports for local multicast groups
>     
>     The range of addresses between 224.0.0.0 and 224.0.0.255
>     inclusive, is reserved for the use of routing protocols and other
>     low-level topology discovery or maintenance protocols, such as
>     gateway discovery and group membership reporting.  Multicast
>     routers should not forward any multicast datagram with   destination
>     addresses in this range, regardless of its TTL.
> 
>     Currently, IGMP reports are generated for this reserved range of
>     addresses even though a router will ignore this information since
>     it has no purpose.

Hi Philip

What about switches which are doing IGMP snooping?

     Andrew