[Winpcap-users] Multi-threaded application with mutiple pcapinstances

Gianluca Varenni gianluca.varenni at cacetech.com
Mon Oct 23 16:00:17 GMT 2006


can you please try using WinPcap 4.0 beta2 and tell me if the problem 

Have a nice day

----- Original Message ----- 
From: "Tal Cohen" <talc10 at hotmail.com>
To: <winpcap-users at winpcap.org>
Sent: Sunday, October 22, 2006 5:06 AM
Subject: [Winpcap-users] Multi-threaded application with mutiple 

> Hi,
> (it seems that my previous question was discarded ... HTML...)
> I'm new with pcap (C++, windows server 2003, pcap ver 3.1) and I would 
> like to get some tips about a real-time appication that I have written:
> 1. The application create 2 threads. Each thread using its' own pcap 
> instance, where each thread reads a packet, manipuilates it and then sends 
> it (using the pcap instance. Read, manipulte and send are implemented on 
> each pcap handler).
> 2. Each thread is handling different traffic (different pcap filters).
> 3. The 2 pcap instances share the same NIC.
> 4. I get a little pcap send packets errors.
> Do I have to use critical sections / synchronization objects with the 
> above? As I wrote, I use 2 differnet pcap instances but they share the 
> same physical NIC.
> What can be the reason for the pcap send packet errors? I get only a 
> generic error ("send error: PacketSendPacket failed").
> Thanks for the help,
> Tal
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