Ethereal-users: Re: [Ethereal-users] capturing loop back packets

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From: Guy Harris <guy@xxxxxxxxxxxx>
Date: Sun, 25 Jan 2004 11:38:49 -0800
On Sun, Jan 25, 2004 at 07:59:46AM -0600, Marc.Mayo@xxxxxxxxxxxx wrote:
> I've got two Windows Apps that can talk to each other through UPD, through
> the loop back address (127.0.0.1).  When I capture with Ethereal, I don't
> see the packets.

You won't see them with any WinPcap-based capture program; there's no
network interface device (not even a pseudo-device with no associated
hardware, as many UNIX systems have) on Windows for loopback, and
WinPcap has to capture on a device.

See

	http://www.ethereal.com/media.html

for information on the types of devices on which you can capture on
various OSes.