[Winpcap-users] Strange packets timing

Franz P accia77 at hotmail.com
Mon Jan 26 10:47:32 GMT 2009

Hello everybody,
i am using wireshark 1.0.5 to sniff some UDP traffic that i am generating from an application i'm developing: i am working on a windows xp pro based pc,using visual basic 6 and MS visual studio 6 as my development platform,and using a gigabit NIC (but working in a 100Mbps network).

My application generates a UDP packet every 10ms:i monitor this timing from my application with an high resolution timer,so i am pretty sure about this timing datum.
While sniffing the traffic,though,i can clearly see a smaller delta time between each packet (from about 7 to 9ms).

Before posting i have read about wireshark timestamps,finding out they are taken from winpcap (from the wireshark wiki:"Wireshark just gets its timestamp from libpcap/WinPcap, and
libpcap/WinPcap gets it from the packet capture mechanism it uses;
Wireshark itself doesn't generate the timestamp so there's nothing
Wireshark can do about it.").

Besides,i have read the post at http://www.mail-archive.com/[email protected]/msg02490.html ,which seems to be related to my problem.

I just find it strange that i can see a smaller delta time....i wouldn't be surprised if that would be higher....
Why does it happen?
Thanks in advance!

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