Go back to your Wireshark screen and press Ctrl + E to stop capturing. This is where you type expressions to filter the frames, IP packets, or TCP segments that Wireshark displays from a pcap. Try selecting pcap-ng format instead; that supports multiple link-layer header types in a single file. Later versions of Wireshark save the output in the pcapng by default. anna_00的博客. In above command. tshark -r udp.pcap -T pdml >temp.pdml I got this error: tshark: The file "udp.pcap" isn't a capture file in a format TShark understands. It consists of devices designed to help measure the ins and outs of the network. See below. I also try tcpdump -r udp.pcap and I got this error: tcpdump: bad dump file format Looks like I have an invalid file format. How were those files created? You can also tell Wireshark to save to a specific (“permanent”) file and switch to a different file after a given time has elapsed or a given number of packets have been captured. These options are controlled in the “Output” tab in the “Capture Options” dialog. We can perform string search in live capture also but for better and clear understanding we will use saved capture to do this. Capture files and file modes. not open can file wireshark. Installation of Wireshark Software. and has an OK button. tcpdump抓包写入文件参数应该用 -w 而不是 > 例如： tcpdump -i eth0 src host 192.168.1. -R
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