Re: Req: Information regarding wireshark file logging

[Douglas Ross <doug_ross_59 () yahoo co uk>]

I'd like to discuss a point about "temporary" files.

In my experience (Windows), ethereal/wireshark creates files in the location specified by the user (if not stdout).
So they are "permanent".

However, they may be overwritten if the "ring buffer" specifications allow.

Or have I missed something we should all be aware of ?

Doug




________________________________
From: Guy Harris <guy () alum mit edu>
To: Community support list for Wireshark <wireshark-users () wireshark org>
Sent: Mon, 31 May, 2010 6:12:51 PM
Subject: Re: [Wireshark-users] Req: Information regarding wireshark file logging


On May 30, 2010, at 9:15 PM, surabhi pandey wrote:

> I want to know how the wireshark captured file are stored (i.e) in which format is it stored , whether a live capture 
> is stored temporarily in a file or is it stored in some database. If in the file than what is the file format it 
> uses. 

A live capture is stored in a temporary file.  The file is in, as Douglas Ross noted, in libpcap format; that format 
was originated in the libpcap library (or possibly in the tcpdump program, if tcpdump existed before libpcap did; 
perhaps libpcap was made out of the low-level platform-dependent capture portion of tcpdump), and is also used by many 
other programs, including tcpdump.

Newer versions of Wireshark can also save the temporary file in pcap-ng format; see

    http://www.winpcap.org/ntar/draft/PCAP-DumpFileFormat.html
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