webDAV and WireShark

Hi all

I noticed "NI_WebDAV.lvlibirecotry Listing.vi ' ~ 45 seconds back with the remote server lists, while Internet Explorer performs the same task in 1.3 seconds.

I ran a wireshark with capture filter "computer host and .

During the capture of the traffic of Internet Explorer, I get packets of 1821 and wireshark capture file is large ~2.7MB.

When I capture "Directory Listing" LabVIEW traffic (using a breakpoint immediately before the VI so I can start the capture after the WebDAV session is created), I get 9316 packages and the capture file is 14 MB.

Curiosities about two things:

(1) why the labview function is screw up the network that request data both to get more or less the same information (perhaps a 'base Directory Listing.VI' must be created and that returns the same information than Internet Explorer, in other words: list of all files and folders, date and time of files, size of files (, file names) and nothing else?)

(2) in BOTH cases, I can't for the life of me find ALL the packages from the laptop TO the server?  -J' have even extended by capturing ALL traffic from all interfaces in promiscuous, from the VI mode after the capture was on, wait the full VI (opening of webdav session, request the inclusion in the directory <...43 seconds...="">close the webdav connection, then by using filters to show me all the traffic display with eth.dest == and I'm still not the packets to THE Server!   So HOW are sessions/connections to a webDAV server and how the queries/commands are sent to the server how can I capture that traffic!

To answer my own question:

Several types of "on the network" communication exists at a level very deep down in the OS kernel. These (outgoing) packets are not visible to the software running on the same computer.  This is why wireshark is unable to see these packets.

The solution is to get something like the SharkTap network sniffer for ~ $70, or use an old school HUB (with absolutely no capacity of switching, so in other words nearly impossible to find these days as weven products labeled as hubs are really primitive switches), OR switch you can do different types of worms the front of a 'service' of the switch port managed a costly.

I ended up using the SharkTap.  So now I can do a WireShark capture "man in the middle" using my laptop out of the "Harbour Centre" on the SharkTap with another device (PC, cRIO, etc.) and the network/server on the other two ports and voila, I can now see Journal of WebDAV, WebDAV and other low level (windows remote desktop applications windows network fileshares etc.) packets to destination between my "client" and "Server". "»

Regarding the filters capture and tips I found useful:

You can use Boolean operators such as AND and OR with (parentheses) to build filters developed, however, I found I especially need just a few and what I do anyway.  I usually only filter by 'destination' of the MAC using MAC of sender and receiver addresses.  It cuts all random ARP and other programs that I fear not (usually) with, while ensuring that get ALL the rest... If it's too much, I add in the filters of port or Protocol to reduce further messages.

Configures this capture filter to capture only the packets going to the MAC or MAC:

dst XX or XX dst ether ether (for source, or ether host of variations of this filter, you can use CBC ether).

Keywords

WebDAV wireshark

Tags: NI Software

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