I want to enable IP multicast support on my FreeBSD box, how do I do it? (Alternatively: What the heck IS multicasting and what applications make use of it?)

Frequently Asked Questions for FreeBSD 2.X : Networking : I want to enable IP multicast support on my FreeBSD box, how do I do it? (Alternatively: What the heck IS multicasting and what applications make use of it?)
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10.10. I want to enable IP multicast support on my FreeBSD box, how do I do it? (Alternatively: What the heck IS multicasting and what applications make use of it?)

Multicast host operations are fully supported in FreeBSD 2.0 by default. If you want your box to run as a multicast router, you will need to load the ip_mroute_mod loadable kernel module and run mrouted.

For more information:

Product		Description		Where
--------------- ----------------------- ---------------------------------------
faq.txt		Mbone FAQ		ftp.isi.edu:/mbone/faq.txt
imm/immserv	IMage Multicast 	ftp.hawaii.edu:/paccom/imm.src.tar.Z
		for jpg/gif images.
nv		Network Video.		ftp.parc.xerox.com:
					/pub/net-reseach/exp/nv3.3alpha.tar.Z
vat		LBL Visual Audio Tool.	ftp.ee.lbl.gov:
					/conferencing/vat/i386-vat.tar.Z
wb		LBL White Board.	ftp.ee.lbl.gov:
					/conferencing/wb/i386-wb.tar.Z
mmcc		MultiMedia Conference	ftp.isi.edu:
		Control program		/confctrl/mmcc/mmcc-intel.tar.Z
rtpqual		Tools for testing the	ftp.psc.edu:/pub/net_tools/rtpqual.c
		quality of RTP packets.
vat_nv_record	Recording tools for vat	ftp.sics.se:archive/vat_nv_record.tar.Z
		and nv.