Question : Alert from SonicWall Intrusion Prevention IP spoof dropped

We've got a class c network with range 192.168.67.xxx
Since we installed the sonicwall we get alerts of category Intrusion prevention.

 #             Time      Priority      Category      Message      Source      Destination      Notes      Rule
1            05/17/2010 11:58:01.288      Alert      Intrusion Prevention      IP spoof dropped      169.254.108.176, 137, X0      192.168.67.2, 137, X0      MAC address: 00:19:b9:d3:5c:39

How we can see is the source ip from an other network and from plug X0 (LAN). I already looked for something like a router but can't find anything like that.

What can I do for the analysis of this issue?

Answer : Alert from SonicWall Intrusion Prevention IP spoof dropped

I think we posted simultaneously.  Try to disable the NIC if isn't doing anything.  That route is added automatically.  Disabling the NIC should remove it.