Forward router multicast packets

IGMP snooping: The interception method for multicast traffic

Multicast snooping helps switches and internet routers Multicast data streams particularly efficient to bring you to the desired destination or goals. How valuable this support is becomes clear when such a filtering method for multipoint transmissions is missing: The incoming multicast packets are then sent to all hosts on the network that the switch or Internet router can reach. In larger networks in particular, this approach leads to unnecessarily high traffic, which can even lead to network overload. Criminals can even take advantage of this fact and deliberately flood individual hosts or the entire network with multicast packets in order to bring them to their knees like in a classic DoS / DDoS attack.

With IGMP snooping switched on, such overload problems and attack scenarios can be ruled out. All hosts on the network only receive Multicast traffic, for which they have previously submitted a group request Registered to have. The use of "Lausch" technology is therefore worthwhile wherever applications are used that require a great deal of bandwidth. examples for this are IPTV and other Streaming services as Web conference solutions. However, networks in which there are only a few participants and hardly any multicast traffic do not benefit from the filter method. Even if the switch or router offers the multicast snooping feature, it should remain switched off in this case in order to prevent unnecessary eavesdropping activities.