Beware, You should not use frame.time_delta in display filters. The reason is that this field is based/calculated from only those packets that are displayed. When you apply a filter, the set of packets is changed. Thus all the frame_delta_time fields have their values changed everytime a new filter is applied.
it is not deterministic what displayfilters with frame.time_delta will do. From: "Martin Regner" Subject: Re: [Ethereal-dev] hanging graphs I tried to prepare a color filter for negative frame.time_delta. I thought that it would be possible to use a filter like frame.time_delta < 0 or !(frame.time_delta >= 0) but I don't get it to work (Ethereal 0.9.8, Windows 2000/98). I can filter out packets where frame.time_delta >= 0, but not the opposite.
