Hello, David! No, no.. It is just a one of the hundreds test i've done, and i don't measure timestamp spread with it..
Thanks, bye.. 22.09.2010, в 13:10, Fish (David B. Trout) написал(а): > Alimjan Kuramshin wrote: > > (rearranged for clarity) > >> David, can You please see this Wireshark log: >> http://www.winpcap.org/pipermail/winpcap- >> users/attachments/20100622/794818cb/attachment-0001.zip > > Yes, I can see what you are talking about. > > >> using Winpcap examples, i've write a small test program, >> when pcap_next_ex return some packet i've send the same >> (or custom packet) back using pcap_sendpacket > > Whoa! Stop! Why are you doing that?! > > If you are trying to measure the accuracy of WinPCap's timestamp, then you > should just do the following: > > 1. Send a series of custom packets (using pcap_sendpacket). Each packet > should have a unique "packet number" in its payload (data). This is so you > can uniquely identify each packet. > > 2. Use oscilloscope to measure and record the exact delay between each > packet on the wire. > > 3. Capture those same packets on a completely different computer (i.e. a > computer that is NOT the one that is sending them). > > 4. Use Wireshark to view the timestamp that the receiving (capturing) system > assigned to it. > > 5. Verify that the same delay(s) seen physically (via your oscilloscope > recording) are the same delays on the captured packets as shown by > Wireshark. > > > I'm confused why you are sending what you are receiving? You should be > sending on one computer and receiving on another. That's it. Nothing more. > Just send on one computer and capture on another, with the oscilloscope in > between. > > What you've written above ("when pcap_next_ex return some packet i've send > the same ... back using pcap_sendpacket") seems to imply you are measuring > something completely different from what I thought you were measuring. > > -- > "Fish" (David B. Trout) > [email protected] > > > > > _______________________________________________ > Winpcap-users mailing list > [email protected] > https://www.winpcap.org/mailman/listinfo/winpcap-users _______________________________________________ Winpcap-users mailing list [email protected] https://www.winpcap.org/mailman/listinfo/winpcap-users
