s0 : Snap length, is the size of the packet to capture. This is handy for not only viewing the IP / port numbers but also when capturing a large amount of data, as the name resolution will slow down the capture. A double ( nn) will not resolve hostnames or ports. nn : A single ( n) will not resolve hostnames. Not always required if there is only one network adapter. i : Select interface that the capture is to take place on, this will often be an ethernet card or wireless adapter but could also be a vlan or something more unusual. :~$ sudo tcpdump -i eth0 -nn -s0 -v port 80 The following command uses common parameters often seen when wielding the tcpdump scalpel. Capture with tcpdump and view in Wiresharkįirst The Basics Breaking down the Tcpdump Command Line Capture Start and End Packets (SYN/FIN)ġ9. Example Filter Showing Nmap NSE Script Testingġ6.
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