This is our old Q&A Site. Please post any new questions and answers at

Hi, I'm trying to split a large PCAP by limiting each output file to 5 million packets using the EditCap CLI. I use command "editcap -c 5000000 inputFilePath outputFilePath" and some sort of split occurs. But when I tshark the resulting files, they each seem to start at index 1 in the first column, and at time 0 in the 2nd column. Is there a way to maintain the original values for either of these first two columns? Need the time to be maintained at least constant from the original file.

asked 16 Oct '17, 18:37

someDude's gravatar image

accept rate: 0%

The index is the index into that particular file, so no, that will always start at 1.

The time is the time from the previous packet in that particular file, so no, that will always start at 0

As you remark that the 'time to be maintained at least constant from the original file' I assume you mean that you want to keep the original wall clock timestamps. That in fact is happening, you would have to select the timestamp output to print the wall clock time instead of time since previous packet.

permanent link

answered 16 Oct '17, 23:16

Jaap's gravatar image

Jaap ♦
accept rate: 14%

Thanks. I'm checking out regarding timestamp formats. Do you know if the format can be selected after i already have the original pcap file, or is the formatting some setting that needs to be specified prior to capturing the packets? Will accept answer when get these specifics figured out

(17 Oct '17, 05:20) someDude

The time format sets how timestamps are displayed, it does NOT affect the timestamps in the file.

(17 Oct '17, 05:24) grahamb ♦

Just add another column for Absolute Time: Edit -> Preferences -> Columns -> + -> Absolute date, as YYYY-MM-DD, and time Rename the column and drag it to whatever location in the list you like. You can have multiple time format columns.

(17 Oct '17, 06:45) cmaynard ♦♦

Ok thanks, so I'll check into splitting the file, then rendering the times in Absolute format via . Cannot really use the WS UI for this purpose since I need to automate this.

(17 Oct '17, 07:38) someDude
Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text]( "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:


question asked: 16 Oct '17, 18:37

question was seen: 429 times

last updated: 17 Oct '17, 07:38

p​o​w​e​r​e​d by O​S​Q​A