li>
<li> '<tt>ip-multicast-loop</tt>':
Specifies whether or not a copy of an outgoing multicast
datagram is delivered to the sending host as long as it is a
member of the multicast group.
Receives a boolean value;</li>
<li> '<tt>ipv6-v6only</tt>':
Specifies whether to restrict <tt>inet6</tt> sockets to
sending and receiving only IPv6 packets.
Receive a boolean value;</li>
<li> '<tt>ip-multicast-if</tt>':
Sets the interface over which outgoing multicast datagrams
are sent.
Receives an IP address;</li>
<li> '