How to Use the Tcpdump Command
The tcpdump
command is a powerful network packet capture tool available in most Unix-like operating systems. It allows you to capture and analyze network traffic on a specific network interface. Here’s a basic usage example:
tcpdump [options] [expression]
To use tcpdump
, you typically need root or superuser privileges. Here are a few common options and examples:
- Capture packets on a specific network interface:
sudo tcpdump -i eth0
Replace eth0
with the name of the network interface you want to capture packets from.
- Capture packets with a specific port number:
sudo tcpdump port 80
This captures packets with a destination or source port number of 80 (HTTP).
- Capture packets with a specific IP address:
sudo tcpdump host 192.168.0.1
This captures packets with a source or destination IP address of 192.168.0.1.
- Capture packets with a specific protocol:
sudo tcpdump icmp
This captures ICMP (ping) packets.
- Capture packets and save them to a file for later analysis:
sudo tcpdump -w capture.pcap
This captures packets and saves them to a file named capture.pcap
.
These are just a few examples of how you can use the tcpdump
command. There are many more options and filters available to customize your packet capture. You can refer to the tcpdump
manual (man tcpdump
) for more details on the available options and expressions.
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