Re: [Full-Disclosure] Strange TCP/IP DNS traffic

From: Nils Ketelsen (nils_at_druecke.strg-alt-entf.org)
Date: 06/03/04

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    To: full-disclosure@netsys.com
    Date: Thu, 3 Jun 2004 11:29:25 -0400
    
    

    On Thu, Jun 03, 2004 at 05:35:22PM +0300, Shachar Shemesh wrote:

    > The outbound traffic is not generated by the local bind installation,
    > which was asked to bind to port 53 for outbound traffic. Also,
    > /etc/resolv.conf lists 127.0.0.1 as the nameserver, so as far as I
    > understand such traffic should not be initiated by user programs.
    >
    > Anyone has any idea what that may be?

    Easiest guess: Some user doing an host or nslookup or something, by hand
    choosing to send it to the nameserver the packets are targeted to. Something
    like "host -t ns microsoft.com H.GTLD-SERVERS.NET"

    Or some stupid application not using the gethostbyname systemcall but
    rather implementing it itself. There are some people out there believing
    they can do it better than the system call. Most of them screwed it up.

    Nils

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    Nils Ketelsen  // Mississauga, Canada
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