What's the hook and double hook meaning in wireshark? What's the hook and double hook meaning in wireshark? ![enter image description here]( ![enter image description here]( you see the two snapshots up there, when I select #7 the #6 will be hooked. when I select the #8, the #5 will be double hooked. What's the meaning of those?

The single check mark is the ACKnowledgement for the selected packet (obviously you've got an ordering problem here). The double check mark is a duplicate acknowledgment for the selected packet.

You can find out all about Wireshark's _Packet List Pane_ in the help _3.17 The "Packet List" Pane_.