Re: Split Kismet log file

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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