Copy the GUID of necessary interface and pass it as argument for -i switch and run dumpcap again.
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In fact, the Wireshark capture options dialog pictured below is primarily a wrapper for arguments passed to dumpcap. Further, like tcpdump, it is built on the libpcap library and uses the same capture filter syntax. We can tell dumpcap to begin writing a new file every time the current file reaches a given size (in kilobytes). Wireshark Compare Capture Files Serial Number And TimestampThe filename given will be appended with a serial number and timestamp to ensure uniqueness. ![]() ![]() For example, the following command captures only DNS traffic destined to or coming from 208.67.220.220. WireShark is a great tool in troubleshooting network-related problems, but I so hate the GUI for the capture of traffic. Disabling the Update List of Packets in Real Time option allowed Wireshark to run for more than a week at a time in continuous capture mode. The scrolling display cannot keep up with a high volume packet capture, and eventually gets so far behind that it is still displaying data from the first capture file in the buffer when Wireshark is attempting to overwrite that file. Wireshark Compare Capture Files Driver From TheIve also taken to (on a Windows PC) unbinding IP and all other protocols besides the WinPCap driver from the interface, and killing any extraneous process running on the machine. Set power preferences to do nothing upon closing the laptops lid, make sure the rest of the power profile is set never to sleep or spin anything down. You dont want the buffer file to be anywhere near the amount of physical RAM in your capture machine. You also dont want to be turning the file over every 5 minutes. You want to keep plenty of space on disk for operating system scratchswap room. And based on the frequency of the problem and the ability to get back to the site to collect the files you need to make sure the ring is large enough that you wont lose the occurrence due to overwrite. No restart of capturing utility is needed if filters need to change. Wireshark Compare Capture Files Plus Robust DiskAdditional tuning is to configure interrupt coalescing on the NICs and to increase amount of memory for kernel for really high packet rates (200000 paksec) plus robust disk subsystem is needed. Providing you know what your are supposed to see on your network. It uses daemonlogger from sourcefire for its packet dump daemon. Running dumpcap with -D switch will display the list of interfaces with GUID.
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