Ethereal-users: Re: [Ethereal-users] Problem with tethereal -z proto, colinfo, tc p.analysis.xxx

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From: Guy Harris <guy@xxxxxxxxxxxx>
Date: Wed, 1 Oct 2003 14:05:33 -0700

On Oct 1, 2003, at 12:01 PM, Jeff Dubis wrote:


However I can't seem to get the tcp.options.xxxx parameters to work.

I tried:
 Tethereal -o tcp.analyze_sequence_numbers:true -z proto,colinfo.tcp.options.sack,tcp.options.sack 

But no luck.
Does your capture have any frames with selective acknowledgements in them? If not, you won't ever see tcp.options.sack in the Info column - it's a Boolean, but it's only put into the protocol tree if it's true.
(tcp.options.sack_perm won't work even if you *do* have frames with that option, as there's nothing in the TCP dissector that puts it into the protocol tree.)