[Guy Harris <guy@xxxxxxxxxxxx>]

On Sep 30, 2003, at 8:58 PM, Jeff Dubis wrote:

> Does anyone know why tethereal 0.9.15 does not seem to produce the 
> additional columns for tcp.analysis and tcp.options parameters such as 
> tcp.analysis.ack_rtt or tcp.options.sack ? 
>
> Other columns such as tcp.flags.syn are added to the packet without a 
> problem.

If you hadn't added the second paragraph, my first suggestion would 
have been "perhaps because the filter in the -z flag didn't have the 
field in it" - a not-exactly-obvious characteristic of the -z flag is 
that the filter has to include the fields that are being added to the 
Info column, as otherwise the display filter code isn't "primed" to 
fetch their values.  (I'd consider that a misfeature, at best, and 
arguably a bug.)

However, as you did, that wasn't the problem.  The problem is probably 
that you don't have TCP sequence number analysis turned on; try running 
Tethereal with the flag "-o tcp.analyze_sequence_numbers:true".