[Winpcap-users] Changing WinPCAP Filters on the Fly

John Hermanski john.hermanski at eicon.com
Fri May 4 15:43:21 GMT 2007

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
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.

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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