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Network Magic: Multicasting, UDP and IGMP

Christoph Lameter

The network layer can accomplish some amazing feats with the rarely used multicast features in the Linux kernel. Not only is it possible to send a single message to multiple recipients but the network is also dynamically reconfiguring itself to provide for your communication needs using IGMP.

Some degree of independence from the IP addresses of the machines in the network can be accomplished. The network state becomes important and one does not communicate with hosts but with communication channels that every host can tie into. The network develops an intelligence in itself. It can discover new services, fall back dynamically and trigger actions on multiple hosts in a single message. All of these feats occur with a much higher speed than TCP.