I just had a similar problem, where windows didn't pass a unicast packet to my 
application when the device and the windows PC had the same IP address. Turns 
out it was a windows firewall issue although the same program was running fine 
without a firewall exception...

Simon

"Bill Auerbach" <[email protected]> wrote:

> I just ran into something.  A customer programmed a “bad” static IP address 
> in his lwIP-based device.  My ipconfig utility broadcasts a “who’s there” UDP 
> message and is broadcasted back from the lwIP device the “here I am” packet.  
> The problem is, with the bad IP address as the source, Windows will not send 
> the packet to the program.  But, Wireshark does show both broadcasts.  Tthe 
> user is not sure what was entered, I can make it happen if I set the lwIP 
> device to 250.168.1.1.  I know it’s in the unicast range, but why is this 
> effecting broadcasts?  Going forward we will better error check the static 
> address that the user enters, but is this broadcast filtering expected?
> 
> Thanks,
> 
> Bill
> 
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