Re: Packet Loss via Netflow

From: Hendrik Visage (
Date: Fri Mar 23 2001 - 00:33:39 PST

  • Next message: Christian Hammers: "Re: [Re: Packet Loss via Netflow]"

    I think the question might be: "packet loss due to congestion over
     serial link" (or similar), not of the NetFlow data that have been lost.

    The amount of NetFlow data/packet loss can be determined as described below.
    However, I don't know of any idea NetFlow data based on the first question.

    Having said that, the way I'd "determine" that loss, would be to check the
    data coming in on the first router, and compare it to the data that's
    received on the second router.


    On Thu, Mar 22, 2001 at 09:57:32PM +0100, Christian Hammers wrote:
    > On Thu, Mar 22, 2001 at 12:13:39PM -0800, Steve Cerruti wrote:
    > > I have been attempting to ascertain if there is a way to measure packet loss
    > > via Netflow data. Is there enough information available to determine packet
    > > loss?
    > Each router maintains a flow sequence number that is written
    > in the netflow packet header. If you make a list for each router and
    > always add the number of flow records to the sequence number you should get
    > the next sequence number and thus are able to find missing flow numbers.
    > (anybody a handy SQL statement for this?)

    > bye,
    > -christian-
    > --
    > Christian Hammers WESTEND GmbH - Aachen und Dueren Tel 0241/701333-0
    > Internet & Security for Professionals Fax 0241/911879
    > WESTEND ist CISCO Systems Partner - Premium Certified
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    Hendrik Visage
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