Firewall error - destination? port? source?

From: Richard Edwards (richard@not.my.address.com)
Date: 06/11/02 

From: "Richard Edwards" <richard@not.my.address.com>
Date: Tue, 11 Jun 2002 15:52:00 +0100

I receive the following message (see below). The MAC address is my server.
The port (I believe) is a netbios broadcast.
My question is: Why is the destination 192.168.100.207? A quick search
reveals the 'owner' to be Internet Assigned Numbers Authority in the US
(iana.org).

Any ideas?

*****
11/06/2002 15:33:01.800 - IP spoof detected - Source:10.8.197.36, 137, LAN -
Destination:192.168.100.207, 137, WAN - MAC address: 00.B0.D0.79.42.7F -
*****

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