Wireshark · Wireshark-users: [Wireshark-users] One question about [TCP]Syn, Ack retransmation

[Liu Xiaozhong <xzhliu06@xxxxxxxxxxx>]

Hi, there

         Now I am using Wireshark in a project. I get pcap files in Gb & Gn interfaces as the attachment, there are many [TCP]Syn, Ack retransmations in the TCP three handshake, as you see in the follow figure:

The two underlined messages content looks like no difference, and the time delay between two messages is about 300ms. There are many [TCP]Syn, Ack messages like this in the capture file. Is this retransmation valid? And in what case can this situation happen?

 

Thanks in advance

Andy

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