Wireshark-users: Re: [Wireshark-users] tcp.time_delta column with tshark
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From: Sake Blok <sake@xxxxxxxxxx>
Date: Sat, 29 Jan 2011 17:24:21 +0100
On 29 jan 2011, at 16:52, j.snelders wrote:

> On Sat, 29 Jan 2011 00:26:40 -0800 (PST) vincent paul wrote:
>> 
>> 1) I try to use tshark to export a capture into csv file.  I use -T fields
>> -E 
>> separator=, -e tcp.time_delta.......  I could see other column data but
> not
>> 
>> tcp.time_delta .  Any idea.
> 
> No, but it does print the frame.time_delta
> $ tshark -r test.pcap -T fields -E separator=, -e frame.number -e frame.time_delta

In order to be able to use tcp.time_relative and tcp.time_delta, you will need to enable TCP timestamps. This is disabled by default (for performance optimization).

You can check whether tshark is using TCP timestamps:

$ tshark -G currentprefs | grep tcp.calculate_timestamps
tcp.calculate_timestamps: TRUE
$

If you want to enable them, use:

tshark -o cp.calculate_timestamps:TRUE -r <file> -T fields -e ... -e tcp.time_delta -e ...

Cheers,


Sake