ntop  

RE: [Ntop] netflow sampling rate

Burton Strauss
Mon, 11 Jul 2005 15:40:29 -0700

I don't think you can - sampling is usually a function of the COLLECTOR not
the receiver (ntop).

Scaling is very different than sampling, btw.  

And any assumption that 1/64th the traffic is a good metric for 1/1th the
traffic is probably fatally flawed unless you really, really understand your
traffic.


-----Burton 

-----Original Message-----
From: [EMAIL PROTECTED] [EMAIL PROTECTED] On Behalf Of
Brgomeistr
Sent: Monday, July 11, 2005 3:50 PM
To: [EMAIL PROTECTED]
Subject: [Ntop] netflow sampling rate

How do I set the sampling rate for a netflow interface?  I have created a
netflow interface
(NetFlow-device.2) using the netflow device plugin, but am unable to find a
way to set the sampling rate for this interface.  I see that you can modify
the sampling rate for local interface using "Configure > Startup Options".

I am currently exporting netflow data (at a sampled rate of 1 out of every
64 packets) from a router to the ntop server.  This data must be scaled
(x64) to properly indicate the amount of traffic flowing through the
router's interface.  Is there a way to do this via the netflow collector
included with ntop?

Thanks,
-ryan

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