[Guy Harris <gharris@xxxxxxxxx>]

Alexandre Rafalovitch wrote:

> But what situation would you want to use it in? Usually if the IP
> addresses are the same, the traffic will actually go over the local
> interface and Ethereal will not be able to capture it anyway.

...unless you're running on Linux, one of the BSDs (including Mac OS X), 
Digital/Tru64 UNIX, or possibly Irix and AIX if libpcap was built to 
support BPF (*NOT* Solaris or HP-UX or Windows), in which case, you can 
capture on the loopback interface and see traffic from the machine to 
itself.