[Snort-users] catching traffic spikes

W. Salet salet at ...8093...
Mon Jan 27 11:16:03 EST 2003


I have the same problem!

MRTG (Multi Router Traffic Grapher) shows extreme incomming traffic spikes.
Sometimes for two hours! The server slows down and is almost unreachable. I
searched all the /var/log/logfiles & /var/log/apache/logfiles but could not
find anything. So I installed SNORT hoping it could trace the source of this
extreme incomming traffic. I could not find anything in the SNORT-logfiles
which pointed to the extreme traffic spikes. (I am using no firewall or
packetshaper.)

Any ideas how to trace these traffic spikes?


----- Original Message -----
From: "Fraser Hugh" <hugh_fraser at ...2804...>
To: <snort-users at lists.sourceforge.net>; "'Richard Chmura'"
<rchmura at ...5839...>
Sent: Monday, January 27, 2003 6:24 PM
Subject: RE: [Snort-users] catching traffic spikes


> You can also use tools like ntop to generate protocol and host related
> statistics in a graphical format, which might in turn help trim down the
> amount of logfile analysis you need to do.
>
> > -----Original Message-----
> > From: Kenneth G. Arnold [mailto:bkarnold at ...8060...]
> > Sent: Sunday, January 26, 2003 9:50 AM
> > To: snort-users at lists.sourceforge.net
> > Subject: Re: [Snort-users] catching traffic spikes
> >
> >
> > Does this graph represent traffic entering and leaving your
> > network from
> > the internet?  Does it pass through a firewall?  Are you using
> > Packetshaper?  A firewall can keep very good logs of all activity that
> > passes through it.  Analysis of those logs would probably
> > tell you what
> > protocol, what source, what destination and what ports are
> > being used. If
> > you are using packetshaper, the job is much easier since it
> > will tell you
> > the protocol and the application within that protocol that is
> > being used
> > very easily.  My guess is that you could probably find the information
> > faster using one of those two means rather than trying to use snort to
> > find it.
> > Ken
> >
> > On Sun, 26 Jan 2003, Richard Chmura wrote:
> >
> > > This is totally unrelated to the recent MS-SQL worm :-)
> > >
> > > I've been trying to figure out the nature of the seemingly
> > random traffic
> > > spikes on my mrtg graph.  I put some snort rules in place
> > but I was unable
> > > to filter to figure out more about these spikes.
> > > The graph is at:
> > http://members.rogers.com/rchmura/eth0sar-week.png  You
> > > can see the spikes on the green (IN) and blue(OUT) values.
> > The orange line
> > > it's just (green / blue)
> > >
> > >
> > >
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