View TCP receive buffer full in Wireshark

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Both sides of a TCP connection (client / server) maintain a receive buffer, also referred to as a receive window, for incoming data. If the receive buffer becomes full, a Zero Window Condition will occur. When a Zero Window Condition occurs, the host cannot receive any more data. Wireshark has 5 packets that represent this issue:

  • Window Full (notes)
  • Zero Window (warning)
  • Zero Window Probe (notes)
  • Zero Window Probe ACK (notes)
  • Window Update (chats)

Use the following filters to zero in on these packets:

  • tcp.analysis.window_full
  • tcp.analysis.zero_window
  • tcp.analysis.zero_window_probe
  • tcp.analysis.zero_window_probe_ack
  • tcp.analysis.window_update

Of Wireshark only has tcp.analysis.window_update packets, neither host should have had a full buffer.

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