![]() ![]() So wherever you see the -i flag, it will be accompanied by either the interface eth0 or eth1. Note: From now on, I'll use the eth0 or eth1 as the target interface. For example, in the case of the interface eth0, this command will be as: sudo tcpdump -i eth0 Replace the target-interface with the name of the interface you want to scan. The -i flag captures traffic from a specific interface: tcpdump -i Without using any option, Tcpdump will scan all the interfaces. ![]() Capturing Packets for a Specific interface The same functionality can also be gained with the -list-interfaces flag: sudo tcpdump -list-interfaces 2. 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 is a great tool for analyzing networks and hunting down associated network problems. ![]()
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