$OpenBSD: README,v 1.4 2015/02/16 22:53:55 sthen Exp $

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| Running ${FULLPKGNAME} on OpenBSD
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To use igmpproxy on OpenBSD, you will need to configure it by
editing ${SYSCONFDIR}/igmpproxy.conf, and configure the OS for
multicast forwarding:

# echo multicast_router=YES >> /etc/rc.conf.local
# echo net.inet.ip.mforwarding=1 >> /etc/sysctl.conf

and restart. Note that client machines using OpenBSD should
be configured with multicast_host=YES.

Start igmpproxy at boot time in the usual way:

# rcctl enable igmpproxy; rcctl start igmpproxy

PF must be configured so that control packets (proto igmp) and
data packets (destination address within 224.0.0.0/4) are passed.

igmpproxy is licensed under GPLv2 and is based on mrouted code,
the applicable licenses are below: