Re: Question about seeing Latency in TCP conversations

["Sheahan, John" <John.Sheahan () priceline com>]

Thanks Martin, I have never done any graphing at all and didn’t know about the ack_rtt.
In this case, It seems that the ack_rtt shows the rtt between the SYN and the next packet, I need to know if there were 
any packets in the conversation (from SYN to FIN) that have a high RTT…..is there a way to do that?

johnny

From: wireshark-users-bounces () wireshark org [mailto:wireshark-users-bounces () wireshark org] On Behalf Of Martin 
Visser
Sent: Wednesday, January 04, 2012 5:45 PM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] Question about seeing Latency in TCP conversations

Johnny,

The easiest way is to examine the calculated field "tcp.analysis.ack_rtt". This appears in the details window if you 
have TCP Sequence Analysis on.


[cid:image001.png@01CCCB1E.1E450940]

You have to be a little careful when using this though, as Wireshark sometimes miscalculates this in the prescence of 
Duplicate ACKs. The best way to use it (taking out effects of the server processing delay), is during the initial 
handshake. So what I do is filter for "tcp.flags == 0x12" (which is the SYN/ACK) and plot tcp.analysis.ack_rtt or add 
it as a column.

[cid:image002.png@01CCCB1E.1E450940]

Regards, Martin

MartinVisser99 () gmail com<mailto:MartinVisser99 () gmail com>

On 5 January 2012 08:20, Sheahan, John <John.Sheahan () priceline com<mailto:John.Sheahan () priceline com>> wrote:
I have been given a sniffer trace by our application guys and they want me to look through it to see if any of the TCP 
conversations have higher than normal latencies.
The file is kind of big and too much data for me to filter and look at each conversation.

Is there an easy way to do this in Wireshark?

Thanks

Johnny

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