One question about [TCP]Syn, Ack retransmation

[Liu Xiaozhong <xzhliu06 () hotmail com>]

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: 

Description: Description: cid:image001.png@01CD14B8.D8897F00

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

Attachment: 13533097660.rar
Description:

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