From owner-freebsd-net@FreeBSD.ORG  Fri Feb  2 20:19:14 2007
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Date: Fri, 02 Feb 2007 20:19:11 +0000
From: Bruce M Simpson <bms@incunabulum.net>
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Subject: Proposal: remove encap from MROUTING
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How would you all feel about removing the old encapsulation methods from 
IPv4 multicast routing as OpenBSD has done?

http://www.openbsd.org/cgi-bin/cvsweb/src/sys/netinet/ip_mroute.c.diff?r1=1.42&r2=1.43

The last time I deployed any such infrastructure, I had to use gif(4); 
in a NATted world, the encap stuff has never worked cleanly for me or 
been worth the additional effort in deployment.

Regards,
BMS