Re: DoS "Probing" on one of our hosts

From: Christopher Kunz (chrislist_at_de-punkt.de)
Date: 06/30/03

  • Next message: Christopher Kunz: "Re: DoS "Probing" on one of our hosts" 
    Date: Mon, 30 Jun 2003 18:47:14 +0200
To: incidents@securityfocus.com

    King, Brian wrote:

    > without any idea of what kind of traffic it was, I would not assume
    > anything. For one thing, can you prove that the traffic was externally
    > generated? Looking at how aggressively slammer scanned, I would not
    > discount that the traffic could be generated by a worm within your
    > network. Without knowing the destination of the "DOS" packets, you
    > can't tell if it was a routing messup that sent a torrent of data to
    > you.

    I can discount that. The traffic is inbound on the switch to our network
    segment, so it is at least not generated inside our rack.

    > Then again, it could be someone on your internal network probing to see
    > how much they can slow down Yahoo using your bandwidth.

    I don't get that. If someone would be using my bandwidth, how come I see
    100 mbit INBOUND, not OUTBOUND?

    To clarify all this a bit, I have uploaded our uplink provider's rrdtool
    image for the last 24 hours to
    http://www.christopher-kunz.de/images/dos_1.png

    The other two spikes are very similar in height and length.

    --ck 

    -- 
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