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iRTT Field Missing in Capture

We have two Ethernet boards, one board perfectly accomplishes an FTP file transfer, the second does not and it eventually times out early on, mishandling the SYN SYN:ACK phase. We analyzed the two Wireshark captures and noticed that the good capture has the iRTT time stamp field included while the bad one does not. What is the significance of not seeing that iRTT in the bad capture? Is that indicative to why it fails the xfer? Would really appreciate a reply.. Thanks

I would like to attach the screen shot of the two captures but don't see Attach option here..

iRTT Field Missing in Capture

We have two Ethernet boards, one board perfectly accomplishes an FTP file transfer, the second does not and it eventually times out early on, mishandling the SYN SYN:ACK phase. We analyzed the two Wireshark captures and noticed that the good capture has the iRTT time stamp field included while the bad one does not. What is the significance of not seeing that iRTT in the bad capture? Is that indicative to why it fails the xfer? Would really appreciate a reply.. Thanks

I would like to attach the screen shot of the two captures but don't see Attach option here.. here..