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Wierd Multicast (IGMP) traffic on a subnet

I noticed that a lot of hosts on one of our subnets are sending out IGMP ver 1 traffic, to the 228.200.200.1 and the 224.0.0.2 multicast addresses. IGMP pkts show as type 6 or 7 (which both are an unknown IGMP pkt types).

Can somebody help identify the application on the PC's that might be sourcing this.. Is there a registry of IANA assigned Multicast addresses somewhere ?

1 REPLY
Bronze

Re: Wierd Multicast (IGMP) traffic on a subnet

Deepak,

The multicast address 224.0.0.2 is all multicast routers (which is commonly used by IGMP). 228.200.200.1 is not allocated. You can find a list of assigned multicast addresses at:

http://www.iana.org/assignments/multicast-addresses

-Zach

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