The criticism revolved around the interpretation of timestamp information in. These can then be downloaded from multiple sources and reassembled, speeding up transfer rates. If you’re not familiar with this it allows a large file to be split up into lots of segments. These alleged downloads involved the use of BitTorrent. The case concerned Dallas Buyers Club LLC taking Australian ISPs to court to get them to divulge information about users alleged to have downloaded a copyright movie. You may have seen in recent news stories that the evidence of online piracy hunter Daniel Macek has been called into question in the Sydney Federal Court. Since timestamping of frames is intrinsic to the network subsystem, Wireshark is not obligated to perform its own timestamping, but rather utilize the existing capabilities of the OS.Ĭonsequently Wireshark can "capture" raw network packets (with timestamps) using existing system calls.Understanding time stamps in Packet Capture Data (.pcap) files It can only utilize the capabilities that the OS offers through APIs. The software timestamps would be generated by the Linux device driver.ĭetails are described in Documentation/networking/timestamping.txt The hardware timestamps would be generated by the network adapter. Linux supports both hardware and software generated timestamps of Ethernet frames. (You're not clear as to what "latency" you're calculating/measuring and how it varies.)Īpparently you have not considered that the method that Wireshark uses to capture frames can be completely separate from the method that timestamps the frames. If the capture happens at the kernel, I can't explain why the latency is different when using different NICs as they are all using the (same) kernel network stack. But the proper method to answer your question is to actually examine the GPL source code. I've read about a method to receive the raw Ethernet frames before they are processed by the protocol stack. So by simple logic one of your alternatives has to be wrong. You do not specify the manufacturer/model of the hardware or the name of the device driver. There is no common interface to every NIC that's why every OS has to use device drivers to abstract the interface.You only specify the network interface (e.g. You have to assume that this capture cannot happen "in the NIC".
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