From mboxrd@z Thu Jan  1 00:00:00 1970
From: "David S. Miller" <davem@redhat.com>
Subject: Re: sysctl variable to force IGMP version [PATCH]
Date: Wed, 28 Jan 2004 12:00:03 -0800
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To: David Stevens <dlstevens@us.ibm.com>
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On Tue, 27 Jan 2004 14:13:41 -0700
David Stevens <dlstevens@us.ibm.com> wrote:

> Below is a patch that allows forcing of the IGMP version. The primary
> use would be with an IGMP-snooping switch that doesn't grok IGMPv3
> packet formats and when there are no IGMPv2 or IGMPv1 multicast
> routers on the network. By forcing the IGMP reports to version 2 (or
> version 1, for really old switches), Linux would send reports that the
> switch can understand for multicast forwarding to the port.

Perhaps some sanity to prevent values other than 1 or 2 from being
set?