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I just did a tcpdump on the test mail server, and I don't know why is this happening constantly (every second) > udp 64

what is this?

Robert B
That ip ( is on the multicast ip range ( - .... not only that, but it is in the range: - RESERVED

and this is what RFC 3171 says about the reserved range:
Applications MUST NOT use addressing in the IANA reserved blocks.

routers don't route that IP address' traffic ... so it has to be internal traffic.

I'm not sure what it is or does...I'll see if mine is doing it as well.
I didn't see any multicast traffic at all in a 10 minute tcpdump file ... and I sent mail in and out during the period....
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