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Filter Live Log IP-Spoofing ???

Hello 

i have installed astaro at my Home-Network.
the astaro has 3 NIC's . intern,dmz and external

in the internal nework are 2 win-Machines.

my Problem is: The astaro reports that my machines make IP spoofing 

Log-report 
-----------snip -------------------------
Time Source    Destination Protocol TCP-Flags/
ICMP-Type/
HWADDRs 
IP-Address Port   IP-Address Port 
21:41:15 192.168.100.12 138  ->  192.168.100.255 138 UDP  
21:41:16 192.168.100.12 138  ->  192.168.100.255 138 UDP IP SPOOFING
SRC HW ff:ff:ff:ff:ff:ff:00
DST HW e0:29:1d:02:2a:08:00 
21:41:16 192.168.100.12 138  ->  192.168.100.255 138 UDP  
21:41:17 192.168.100.12 138  ->  192.168.100.255 138 UDP IP SPOOFING
SRC HW ff:ff:ff:ff:ff:ff:00
DST HW e0:29:1d:02:2a:08:00 
21:41:17 192.168.100.12 138  ->  192.168.100.255 138 UDP  
21:41:18 192.168.100.12 138  ->  192.168.10.120 138 UDP  
21:41:21 192.168.100.222 138  ->  192.168.100.255 138 UDP IP SPOOFING
SRC HW ff:ff:ff:ff:ff:ff:00
DST HW 50:04:bf:58:16:08:00 
21:41:21 192.168.100.222 138  ->  192.168.100.255 138 UDP  
21:42:18 192.168.100.12 138  ->  192.168.100.255 138 UDP IP SPOOFING
SRC HW ff:ff:ff:ff:ff:ff:00
DST HW e0:29:1d:02:2a:08:00 
21:42:18 192.168.100.12 138  ->  192.168.100.255 138 UDP  
21:42:48 192.168.100.12 138  ->  
----------------snip ---------------------
what's wrong with my Config ? or is that bug ???

thanks for answers

Walter


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