From: Phil Ames (pentest@una-cerveza.com)
Date: Sat Feb 23 2008 - 09:43:07 EST
You can use tcpdump's -C option to split large packet captures:
-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:
tcpdump -r big.pcap -w little.pcap -C 35
would give you little.pcap, little.pcap1, little.pcap2, and so on.
-Phil
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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