[Snort-users] NFS file copy vs. snort ???

Jose Maria Lopez jkerouac at ...12346...
Sun Sep 5 13:50:10 EDT 2004

El dom, 05 de 09 de 2004 a las 22:01, Jason escribió:
> I doubt Snort is interfering directly with your copy but instead you are 
> using under powered hardware for the task of serving NFS and running 
> snort. It sounds like Snort is using all CPU so your NFS copies are 
> slow... try tuning snort.

Maybe just throwing out the NFS rules can give you a speed boost,
because NFS or RPC attacks are not very common today, or follow
the advice of Jason and tune your rules. Maybe you can deactivate
the rpc_decode preprocessor, that probably is doing most of the
work that slows down your connection. As I said RCP attacks are
uncommon today, and if connection speed it's a real matter in
your system you maybe can quit using the rpc_decode processor or
the NFS rules.

> Michael D Schleif wrote:
> > One of my main systems is connected to several NFS v3 servers; and, this
> > box also runs snort.
> > 
> > Copies, like the following examples, are excruciatingly slo-o-o-o-w-w-w,
> > especially when the file is large (e.g., 250 MiB.)
> > 
> > 	cp -a /remote/tmp/* .
> > 	cp -a * /remote/tmp/
> > 
> > By `slow', I mean in the two-digit kbps ;<
> > 
> > I do not find anything interesting in `vmstat', nor in
> > /var/log/{kern.log,messages,syslog}, nor is snort logging anything, in
> > this regard.
> > 
> > My first clue was noticing snort in `top' alternating in the top 2 or 3
> > positions.  Stopping snort on *both* ends of the connection results in file
> > transfers that meet my expectations.
> > 
> > What is going on with this?
> > 
> > How can I configure snort to *not* interfere with NFS?
> > 
> > What do you think?
> > 
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Jose Maria Lopez Hernandez
Director Tecnico de bgSEC
jkerouac at ...12346...
bgSEC Seguridad y Consultoria de Sistemas Informaticos

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