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Sonicwall IP Spoof in log when accessing internal resource from WAN

Last Modified: 2012-05-12
I have a Sonicwall NSA 2400 with the following interfaces:
X0: LAN (
X1: WAN (
X2: WAN (

Our X1 WAN zone has a number of NAT policies that translate inbound traffic to private IPs in the X0 LAN zone.  We have an IP webcam at, and I want to be able to access port 80 on that webcam from the Internet.  I currently have NAT policies that translate to  However, when I try to hit from a computer outside our network, the connection times out and I see the following log on the Sonicwall:

11/02/2011 13:47:44.688      Alert      Intrusion Prevention      IP spoof dropped, 2849, X1, pool-72-66-229-30.ronkva.east.verizon.net, 80, X1, 11-22-33-155.unassigned.myisp.net      MAC address: 00:18:b9:0e:4a:65

I will also mention that I have several other similar NAT policies in place that are working fine.  Just this one isn't working.  Thanks for any help!
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