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The multicast address of 224.0.0.55 has been used for multicasts since the D2000 v7.0. Since the D2000 V7.01.004 release A060113017, there is also used the multicast address 224.0.2.55, because according to RFC3171, the address of 224.0.0.55 is reserved for local broadcasts that are not routed. Implementation of the multicast address of 224.0.2.55 allows to configure the multicast routing, so D2000 system processes may be housed at various network segments. Multicasts  

Multicast requests are sent to the target destination UDP port of 3119, the source UDP port is dynamic. Unicast replies are sent from a dynamic UDP port to the UDP port and IP address from which the original multicast request was sent.

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titleRelated pages:

D2000 system application in redundant system

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