![]() ![]() This will list all the interfaces on the system including wireless and wired interfaces and others. To check all the available interfaces to capture on, use the ‘-D’ flag as: sudo tcpdump -D In this article, I'll focus on core options that are frequently used. Tcpdump has a long list of options available for use. Windows has a ‘Microolap TCPDUMP for Windows’ variant with an associated price tag. It is freely available on Unix and Linux systems. Thanks to the developers, who have kept the Tcpdump as an open source project. ![]() The output from the command displays on the STDOUT and can also be stored in a file. It captures packets as they go by and shows you what’s going on and coming in on your network. Tcpdump -i any 'host 172.31.7.188' -vvnnS -w host-172-31-71-88.Tcpdump is a great tool for analyzing networks and hunting down associated network problems. Track all traffic with particular host with writing it into pcap file (pcap file can be opened in Wireshark then for analysis) Tcpdump -i any '(udp and not dst port 53 and src host 172.31.7.188)' -vvnnS Tcpdump -i any 'dst port 6379' -vvnnS -w redis.pcap Track traffic into Redis and write all packets into pcap file (pcap file can be opened in Wireshark then for analysis) Track TCP SYN-ACK packages to host: external resources sent acknowledge about opening TCP connection Track TCP SYN packages from host: host tries to make to initiate TCP connection with an external source Track all UDP traffic initiated by host (useful to track DNS amplification attack) NOTE! IP addresses specified in commands are just examples. Wireshark is one of the best network sniffers for Windows-based systems. ![]() Tcpdump can be installed by default in some Linux distributions (just type in command line tcpdump), overwise, install it by the command. ![]() Tcpdump is a command line network packet sniffer for Linux-based systems. Here is the list of most popular tcpdump that Dhound team use for production network troubleshooting or capture security events. Please, contact us and send your questions about cyber security - Dhound experts are always ready to help with the security of your website! You can use our TcpDump CheatSheet for free - just follow the link below! The downloaded file can be distributed in any way. ![]()
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