[Openvpn-users] sniffing tap-win32

[Gisle Vanem]

How do I sniff the unencrypted traffic leaving/arriving at the
tap device under Win-XP?

openvpn --show-adapters

Available TAP-WIN32 adapters [name, GUID]:
'OpenVPN tap' {C092B038-B7E7-4D0D-A6A9-BC45D62835D7}

But tcpdump -D shows only my real eth-adapter (2) and my IPv6
pseudo interface (1):

1: \Device\NPF_{7F56352E-EF2F-49F4-844C-BA1FA0105667}
2: \Device\NPF_{93380695-0E31-456C-9EB0-8802E111C09D}

Is it possible at all?

BTW. I've created a MAC bridge connecting the tap and the
physical adapter. This caused my IP to change (fair enough),
but it also generates a lot of Spanning Tree traffic; approx 1
message each second. Does OpenVPN needs this in any way,
or can I turn it off somehow?

--gv

[Rainer Sokoll]

On Wed, May 19, 2004 at 04:29:06PM +0200, Gisle Vanem wrote:

Hi,

Post by Gisle Vanem
How do I sniff the unencrypted traffic leaving/arriving at the
tap device under Win-XP?

[...]

Post by Gisle Vanem
Is it possible at all?

Just tried packetyzer
(http://www.networkchemistry.com/products/packetyzer/) - works.

HTH,
Rainer

[Gisle Vanem]

Post by Rainer Sokoll

Post by Gisle Vanem
How do I sniff the unencrypted traffic leaving/arriving at the
tap device under Win-XP?

[...]

Post by Gisle Vanem
Is it possible at all?

Just tried packetyzer
(http://www.networkchemistry.com/products/packetyzer/) - works.

Tried that too, but that doesn't see the tap-adapter. Not
surprising since both tcpdump and packetyzer uses WinPcap.

Do you have a bridged adapter?

[Julio Maidanik]

Rainer,
Thanks for the information.
I have been using Ethereal till now, but Packetizer has a much improved
human interface.

Julio
////////////
----- Original Message -----
From: "Rainer Sokoll" <***@intershop.de>
To: "Gisle Vanem" <***@broadpark.no>
Cc: <openvpn-***@lists.sourceforge.net>
Sent: Wednesday, May 19, 2004 11:43 AM
Subject: Re: [Openvpn-users] sniffing tap-win32

Post by Rainer Sokoll
Hi,

Post by Gisle Vanem
How do I sniff the unencrypted traffic leaving/arriving at the
tap device under Win-XP?

[...]

Post by Gisle Vanem
Is it possible at all?

Just tried packetyzer
(http://www.networkchemistry.com/products/packetyzer/) - works.
HTH,
Rainer
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