Re: >2Gb capture files

[Martin Roesch <roesch () sourcefire com>]

Ding ding ding!!!  Give that man a cigar.

    -Marty

"Clausing, James A (Jim), SOBUS" wrote:
>         Am I missing something?  More than one snort process can listen on a
> given interface, so start the new one first, then kill the old one.  There
> should be an overlap of a few seconds, but nothing will be lost.
>
> ---Jim
>
> -----Original Message-----
> From: Shriman Gurung [mailto:sg () dataconnection com]
> Sent: Friday, July 06, 2001 9:43 AM
> To: 'snort-users () lists sourceforge net'
> Subject: RE: [Snort-users] >2Gb capture files
>
> It seems to me that even if your system supported 2Gb+ files,
> you would not want to use them.  I find that managing big files
> with the standard tools (tcpdump etc) takes ages and often crashes
> things.
>
> People have suggested regular snort restarts, which by and large
> I agree with, but you might have a really _really_ high traffic site
> in which case this might not be practical.  Back of envelope
> calculation: say you have a (let's pick a number) 48Mbit/s worth of
> evil traffic, ie 6Mb/s then you are filling up 2Gb every five minutes.
> Who wants to restart Snort every five minutes?.
>
> In this scenario, if snort takes three seconds to restart you
> potentially lose 18Mb of traffic, which sounds real bad to me.  If
> you are concerned about losing info whilst snort is restarting, you
> could set up two instances of snort on separate machines configured
> to restart at different times.  For example A restarts snort at t,
> t+5, t+10,.. and B at t+2, t+7, t+12,...
>
> Alternatively, I guess you could set up a collection of machines
> running snort (snorters?) and configure each to log a particular
> type of traffic, the aim being to reduce the amount of traffic that
> each one logged.  The downside of that is complexity.
>
> shriman
>
> sg () datcon co uk
> --speaking for myself not my employer--
>
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--
Martin Roesch
roesch () sourcefire com
http://www.sourcefire.com - http://www.snort.org

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