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Since IPv6 has no broadcast mechanism, a multicast address is
used by the sockets transmitting OLSR packets. Using multicast in
its most basic form in
IPv6 is a matter of setting a socket to join a multicast sender
group and to join a multicast receive group. This is done
using the setsockopt(2) call and the IPV6_ADD_MEMBERSHIP
and IPV6_JOIN_GROUP flags.
The default multicast-address used is ff05::15 for interfaces using a
site-local address and ff0e::1 for interfaces using a global
address, if nothing else is specified by the user. The multicast
addresses to use can be set in the configuration file.