In order to distribute multicast packets, using different multicast addresses and avoiding fault points, a backup server is installed close to a master and converts backup multicast packets and sends them as master multicast packets to the client. At this time, backup multicast packets are delayed and...http://www.google.com/patents/US20050195818?utm_source=gb-gplus-sharePatent US20050195818 - Data communication system, backup server, and communication control apparatus
