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Date: Tue, 25 May 2004 12:59:28 -0700
From: "David S. Miller" <davem@redhat.com>
To: knobi@knobisoft.de
Cc: flind@haystack.mit.edu, linux-kernel@vger.kernel.org
Subject: Re: Multicast problems between 2.4.20 and 2.4.21?
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On Tue, 25 May 2004 11:15:10 -0700 (PDT)
Martin Knoblauch <knobi@knobisoft.de> wrote:

>   what is the name of the sysctl, and when was it added to 2.4? What
> about 2.6.x?

/proc/sys/net/ipv4/conf/${DEV}/force_igmp_version

Replace ${DEV} with a specific device name, "default", or "all"
as desired.

It got added to 2.4.25 I believe, and yes 2.6.x has it too.