When I use the WireShark check the packages:

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there have three place signs I don't understand.

  1. the [ means what? two IPs communicative to each other? but there have other IP in the range. you see the pair( -, there also have other IP (like

2.what's the meaning of -> and <-?


The [ bracket encompasses packets that belong to a single 'connection'.

While that is self-explanatory for TCP and maybe UDP, Wireshark considers ICMP echo requests/replies between two hosts also as a 'connection. Note that only the 'connection' is shown that belongs to the currently selected packet.

The → and ← are similar: they show the 'partner' packet to the currently selected one.

In your example, you've selected inbound #45 which is a reply to outbound #44, and the whole 'connection' started in #35. Note the dotted line in front of #38, #39 and #42 that don't belong to the selected connection.

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