From owner-freebsd-net@FreeBSD.ORG  Thu Jan 28 09:49:49 2010
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Date: Thu, 28 Jan 2010 09:49:46 +0000
From: Bruce Simpson <bms@incunabulum.net>
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Cc: freebsd-net@freebsd.org
Subject: Re: MROUTED: Problem with vif installation
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Tunnel support for MROUTING was removed several FreeBSD releases ago.

We followed OpenBSD with this change because DVMRP's older, naive 
IP-in-IP encapsulation mechanism doesn't offer any benefit, and can't be 
administered. Also, PIM doesn't use it, and PIM is now the industry 
standard.

thanks,
BMS