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Forum Topic - strange behavior of using pcap.h: Page 1 of 82 (82 Items)
   
strange behavior of using pcap.h  
Dear All,

Fortunately I was able to use pcap.h to capture packet in QNX. I am using below command to open a session

/* Open the session in promiscuous mode */
handle = pcap_open_live(dev, 65536, 1, 1000, errbuf);


I am also using below commands to capture and store packets

for(i=0;i<32000;i++)
	{
		packet=pcap_next(handle, &header);
		local_tv_sec = header.ts.tv_sec;
		ltime=localtime(&local_tv_sec);
		strftime( timestr, sizeof(timestr), "%H:%M:%S", ltime);
		fprintf(stream1,"%s,%.6d len:%d\n", timestr, header.ts.tv_usec, header.len);
	}

I have a testing device which sends two packets per 250usec. Therefore, I am expecting to capture packets in the same 
trend.

By the way, two network cards are connected to my QNX target machine and I am using one of them only for data capturing 
from tester.

let's see some part of the captured data. Instead of getting two packets every 250usec I am getting 64 to 65 packets 
every 8389 usec. Is there anything wrong with the settings or netwrok driver in QNX. I tested the same network card in 
windows XP embedded with winpcap and it was working very well. I would be very thankful if you help me.

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