Tcpdump Best Practices

List of interfaces on which tcpdump can listen:


Listen on interface eth0:

Listen on any available interface :

Be verbose while capturing packets:

More verbose while capturing packets:

Very verbose while capturing packets:

Verbose and print the data of each packet in both hex and ASCII, excluding the link level header:

Verbose and print the data of each packet in both hex and ASCII, also including the link level header:

Less verbose (than the default) while capturing packets:

Limit the capture to 100 packets:

Record the packet capture to a file called capture.cap:

Record the packet capture to a file called capture.cap but display on-screen how many packets have been captured in real-time:

Display the packets of a file called capture.cap:

Display the packets using maximum detail of a file called capture.cap:

Display IP addresses and port numbers instead of domain and service names when capturing packets

Capture any packets where the destination host is 192.168.5.1. Display IP addresses and port numbers:

Capture any packets where the source host is 192.168.5.1. Display IP addresses and port numbers:

Capture any packets where the source or destination host is 192.168.5.1. Display IP addresses and port numbers:

Capture any packets where the destination network is 192.168.5.0/24. Display IP addresses and port numbers:

Capture any packets where the source network is 192.168.1.0/24. Display IP addresses and port numbers:

Capture any packets where the source or destination network is 192.168.5.0/24. Display IP addresses and port numbers:

Capture any packets where the destination port is 23. Display IP addresses and port numbers:

Capture any packets where the destination port is is between 1 and 1023 inclusive. Display IP addresses and port numbers:

Capture only TCP packets where the destination port is is between 1 and 1023 inclusive. Display IP addresses and port numbers:

Capture only UDP packets where the destination port is is between 1 and 1023 inclusive. Display IP addresses and port numbers:

Capture any packets with destination IP 192.168.1.1 and destination port 23. Display IP addresses and port numbers:

Capture any packets with destination IP 192.168.5.1 and destination port 80 or 443. Display IP addresses and port numbers:

Capture any ICMP packets:

Capture any ARP packets:

Capture either ICMP or ARP packets:

Capture any packets that are broadcast or multicast:

Capture 500 bytes of data for each packet rather than the default of 68 bytes:

Capture all bytes of data within the packet:

 


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