IP SPOOFING

Dear friends,

   I recived this message, when I check the conections with nbtstat -a:

09:28:37 10.18.4.136 137  ->  10.18.66.9 137 UDP  IP SPOOFING SRC HW 00:48:54:1f:10:ad:00
    DST HW 01:02:ad:2f:52:08:00 

what it is happening????

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