One other note, applications that do tcp keepalives always show up as a retrans the first time the sniffer decodes it, and depending on whether the keepalives have a 1 byte data packet or not, it could decode them as retransmits also.
good luck
No. TCP Retransmits is not a packet type that a display filter can be applied for, but an analysis of retransmitted packets. What you want to do is first make sure that your duplicate packets are not because of the span on your switch, so do a single ping and make sure you see a single icmp...
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