how to rotate a tcpdump file
Matthew Seaman
m.seaman at infracaninophile.co.uk
Sun May 24 06:49:43 UTC 2009
Frank Shute wrote:
> On Sat, May 23, 2009 at 08:52:14PM +0100, Frank Shute wrote:
>> I was thinking of using the -C and -w options to tcpdump(1). From the
>> manpage:
>>
>> -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).
>>
>> and now looking at it more closely, you don't even have to use
>> newsyslog. Just include the args: -C 10000000 -w my_tcpdump_log
>
> Oops! should be: -C 10 -w my_tcpdump_log
>
> I assume the OP is not too bothered whether it's megabytes or
> mebibytes or whatever the hell they call them (using base 10 rather
> than 2).
Hmmm... so when I said "tcpdump(1) doesn't have options to support rotating
dump files based on size" I was in fact *completely* wrong. Memo to self:
RTFM.
Sorry for the noise folks. Given it's a built-in function please ignore all
my blethering about shell scripts.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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