From: Glenn Forbes Fleming Larratt (glrattalumni.rice.edu)
Date: Sat Feb 23 2008 - 08:43:03 CST

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tcpdump/windump will do this.

% sudo tcpdump -r{300M.file} -w{smaller.file.stem} -C10

The -C argument (per the tcpdump man page):

   -C Before writing a raw packet to a savefile, check whether the
       file is currently larger than file_size and, if so, close the
       current savefile and open a new one. Savefiles after the first
       savefile will have the name specified with the -w flag, with a
       number after it, starting at 1 and continuing upward. The units
       of file_size are millions of bytes (1,000,000 bytes, not
       1,048,576 bytes).

So the command above took my 300M file and split it into ~10M files
with the names {smaller.file.stem}, {smaller.file.stem}1,
{smaller.file.stem}2, etc.

tcpdump threw me an error

  "tcpdump: Couldn't change to root uid=0 gid=0: Operation not permitted"

when I tried to run it as a regular user, hence the sudo above.

      -g

On Fri, 22 Feb 2008, Matheus Michels wrote:

> Hey guys,
>
> Is there any way to split up a Kismet (tcpdump/libpcap format) log file in two
> or more pieces? I left Kismet sniffing in a high-traffic network and ended up
> with a huge 300 MB log file (about 600.000 packets), which freezes Wireshark
> if I try to dissect it. I cannot use a faster machine now, so I need to split
> this file in, at most, several 30-40 MB files.
>
> Thanks in advance.
>
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--
Glenn Forbes Fleming Larratt NS2007: "ICE 1, Blue 6"
glrattalumni.rice.edu http://www.io.com/~glratt
There are imaginary bugs to chase in heaven, and muddy blue is the most
beautiful color in the universe.

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