Control traffic

All OLSR control traffic is to be transmitted over UDP on port 698. This port is assigned to OLSR by the Internet Assigned Numbers Authority(IANA). The RFC states that this traffic is to be broadcasted when using IPv4, but no broadcast address is specified. When using IPv6 broadcast addresses does not exist, so even though it is not specified in the RFC, it is implicit understood that one must use a multicast address in this case.