What does TCP Zero Window mean?

Solution Verified - Updated -

Issue

  • What does TCP Zero Window mean?
  • What is a Zero Window in TCP?
  • Network packet capture analysis tools report "Zero Window" packets
  • TCP Zero Window and TCP Window Full observed in packet captures
  • Wireshark shows a message like This is a Zero Window Segment
  • What does the flag TCP Window Full, TCP ZeroWindow and TCP ZeroWindowProbe mean in tcpdump or tshark?
  • Network packet capture analysis tools report Zero Window packets
  • How does flow-control work in TCP?

Environment

  • Red Hat Enterprise Linux, all versions
  • TCP/IP network connection using TCP (Transmission Control Protocol)

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