Question: How Do I Read a Tcpdump File in Linux?
Contents

The “-r” option lets you read the output of a file. All you have to do is use the “-r” option with tcpdump command and specify the path of the file you want to read.

How do I read a tcpdump file?

What does the tcpdump output look like?

  1. Unix timestamp ( 20:58:26.765637 )
  2. protocol (IP)
  3. the source hostname or IP, and port number ( 10.0.0.50.80 )
  4. destination hostname or IP, and port number ( 10.0.0.1.53181 )
  5. TCP Flags ( Flags [F.] ). …
  6. Sequence number of the data in the packet. ( …
  7. Acknowledgement number ( ack 2 )

How does tcpdump work in Linux?

Tcpdump uses libpcap library to capture the network packets & is available on almost all Linux/Unix flavors. Tcpdump command can read the contents from a network interface or from a previously created packet file or we can also write the packets to a file to be used for later.

Maya Lin-Takahashi

Maya Lin-Takahashi

Consumer Tech & Gadget Reviewer

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.

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