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- TCP DUMP COMMANDS
- =================
- See the list of interfaces on which tcpdump can listen:
- tcpdump -D
- Listen on interface eth0:
- tcpdump -i eth0
- Listen on any available interface (cannot be done in promiscuous mode. Requires Linux kernel 2.2 or greater):
- tcpdump -i any
- Be verbose while capturing packets:
- tcpdump -v
- Be more verbose while capturing packets:
- tcpdump -vv
- Be very verbose while capturing packets:
- tcpdump -vvv
- Be verbose and print the data of each packet in both hex and ASCII, excluding the link level header:
- tcpdump -v -X
- Be verbose and print the data of each packet in both hex and ASCII, also including the link level header:
- tcpdump -v -XX
- Be less verbose (than the default) while capturing packets:
- tcpdump -q
- Limit the capture to 100 packets:
- tcpdump -c 100
- Record the packet capture to a file called capture.cap:
- tcpdump -w 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:
- tcpdump -v -w capture.cap
- Display the packets of a file called capture.cap:
- tcpdump -r capture.cap
- Display the packets using maximum detail of a file called capture.cap:
- tcpdump -vvv -r capture.cap
- Display IP addresses and port numbers instead of domain and service names when capturing packets (note: on some systems you need to specify -nn to display port numbers):
- tcpdump -n
- Capture any packets where the destination host is 192.168.1.1. Display IP addresses and port numbers:
- tcpdump -n dst host 192.168.1.1
- Capture any packets where the source host is 192.168.1.1. Display IP addresses and port numbers:
- tcpdump -n src host 192.168.1.1
- Capture any packets where the source or destination host is 192.168.1.1. Display IP addresses and port numbers:
- tcpdump -n host 192.168.1.1
- Capture any packets where the destination network is 192.168.1.0/24. Display IP addresses and port numbers:
- tcpdump -n dst net 192.168.1.0/24
- Capture any packets where the source network is 192.168.1.0/24. Display IP addresses and port numbers:
- tcpdump -n src net 192.168.1.0/24
- Capture any packets where the source or destination network is 192.168.1.0/24. Display IP addresses and port numbers:
- tcpdump -n net 192.168.1.0/24
- Capture any packets where the destination port is 23. Display IP addresses and port numbers:
- tcpdump -n dst port 23
- Capture any packets where the destination port is is between 1 and 1023 inclusive. Display IP addresses and port numbers:
- tcpdump -n dst portrange 1-1023
- Capture only TCP packets where the destination port is is between 1 and 1023 inclusive. Display IP addresses and port numbers:
- tcpdump -n tcp dst portrange 1-1023
- Capture only UDP packets where the destination port is is between 1 and 1023 inclusive. Display IP addresses and port numbers:
- tcpdump -n udp dst portrange 1-1023
- Capture any packets with destination IP 192.168.1.1 and destination port 23. Display IP addresses and port numbers:
- tcpdump -n "dst host 192.168.1.1 and dst port 23"
- Capture any packets with destination IP 192.168.1.1 and destination port 80 or 443. Display IP addresses and port numbers:
- tcpdump -n "dst host 192.168.1.1 and (dst port 80 or dst port 443)"
- Capture any ICMP packets:
- tcpdump -v icmp
- Capture any ARP packets:
- tcpdump -v arp
- Capture either ICMP or ARP packets:
- tcpdump -v "icmp or arp"
- Capture any packets that are broadcast or multicast:
- tcpdump -n "broadcast or multicast"
- Capture 500 bytes of data for each packet rather than the default of 68 bytes:
- tcpdump -s 500
- Capture all bytes of data within the packet:
- tcpdump -s 0
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