[Winpcap-users] Re: Winpcap-users Digest, Vol 26, Issue 4

[Hardik Shah]

John,

filtering at that level will affect the performance of overall system.better thing is to let pcap capture all the data and then run the filtering on another module.because more the flters you have more tedious it will become.
 
--------------------------------
  Hardik Shah
  mobile:- 9827634991
  phone:- +91-0731-2570516  


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Sent: Saturday, 5 May, 2007 5:30:57 PM
Subject: Winpcap-users Digest, Vol 26, Issue 4

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Today's Topics:

   1. Changing WinPCAP Filters on the Fly (John Hermanski)


----------------------------------------------------------------------

Message: 1
Date: Fri, 4 May 2007 11:43:21 -0400
From: "John Hermanski" <john.hermanski at eicon.com>
Subject: [Winpcap-users] Changing WinPCAP Filters on the Fly
To: <winpcap-users at winpcap.org>
Message-ID:
    <E096369D937D3A4DB271B382850C5C5F019D40EE at pysmail.eicon.com>
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Hi, 
I'm looking into using WinPCAP for capturing and recording audio RTP
streams. A single session, using a precompiled filter works just fine.
But in a "real" system, running multiple sessions, packets being
captured would change on a regular basis. A stream can be uniquely
identified by its source and destination UDP ports and IP addresses. To
capture streams for 25 calls, you would need to 'or' together 25
expressions.
Would compiling an expression or putting it into use break down when the
expression got too large? 
When changing compiled expressions while capture is going, can packets
be lost? 
Capturing everything, and then doing filtering myself is an option, but
probably not a good one. 
Thanks for any help or opinions here.

JOHN HERMANSKI
Applications Engineer

Dialogic Research Inc.

Tel: (978) 744-9098
Mobile: (978) 836-8028
Email: john.hermanski at dialogic.com
<mailto:tom.seidenstricker at dialogic.com> 
Web: www.dialogic.com

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