RE: DNS servers outbound connections.

From: Philip Bartholomew (Philip.Bartholomewat_private)
Date: Tue Oct 01 2002 - 23:59:27 PDT

  • Next message: Jeremy Junginger: "RE: Unusual volume: UDP:137 probes"

    I think your on the money there, David
    Thanks, everyone who replied for you help.
    
    Philip
    
    "...isn't is odd that the word innuendo is so suggestive?..."
    
    -----Original Message-----
    From: NESTING, DAVID M (SBCSI) [mailto:dn3723at_private]
    Sent: 01 October 2002 16:06
    To: 'Philip Bartholomew'
    Cc: 'incidentsat_private'
    Subject: RE: DNS servers outbound connections.
    
    
    There's no such thing as a UDP "connection" really.  Are you sure these
    aren't DNS replies to requests made by these remote hosts?  
    
    Frequently if a host tries to perform DNS resolution, it may end up querying
    more than one server in an attempt to get a response.  If it gets a response
    from one, it may tear down the UDP socket even though more than one server
    was queried.  If there are any other replies that get delivered afterward,
    they may get an ICMP Unreachable message generated when they arrive.  This
    may make it seem like the DNS server is trying to send packets somewhere
    they shouldn't be going.
    
    If these are web servers, perhaps they have DNS resolution turned on in
    their logging and you have a user on your network making HTTP requests
    against these servers.
    
    Just some thoughts..
    
    David
    
    From: Philip Bartholomew [mailto:Philip.Bartholomewat_private]
    > I wonder If any of you fine fellows can help. My 2 Nameservers are making
    > a number of  UDP connections "10-20 a minute" originating on port 53 to
    > alternating dest ports e.g.: 1113, 56008, 54002 tries about ten
    
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