Read the articles in docs/FAQ about switches - they apply to routers.  ntop
only sees the packets that the network sends it.  If you think about your
configuration, that's only the packets addressed to the ntop host.

-----Burton
  -----Original Message-----
  From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Terry
Keith-p56554
  Sent: Wednesday, May 05, 2004 1:43 PM
  To: [EMAIL PROTECTED]
  Cc: [EMAIL PROTECTED]
  Subject: [Ntop] ntop Support for WAN


  I am having an issue obtaining network statistics in a WAN using ntop.  I
have obtained and installed the ntop-3.0-Win32-demo.exe executable.  I am
able to connect to the ntop application via the web interface however I
don't obtain any network statistics.  I keep seeing a "No entries to display
(yet)" on the various webpages.  The Hosts tab does not display any of the
hosts on my WAN including the laptop that I installed ntop on.  This seems
odd to me.  The network load page does provide a graph of activity however.

  My network configuration is as follows:

  I have a WAN consisting of 3 routers (EtherFast� Cable/DSL Router with
4-Port Switch) tied into a switch.

  /--------\
  | Switch |
  \--------/
    | | |
    | | |  /--------\  /-----\
    | | +--| Router |--| LAN |
    | |    \--------/  \-----/
    | |
    | |    /--------\  /-----\
    | +----| Router |--| LAN |
    |      \--------/  \-----/
    |
    |      /--------\
    +------| Router |
           \--------/
             | | |
             | | |    /----\
             | | +----| PC |
             | |      \----/
             | |
             | |      /----\
             | +------| PC |
             |        \----/
             |
             |        /-----------\
             +--------| PC w/ntop |
                      \-----------/

  The IP and host name of each machine on the WAN has been put into the
hosts table of PCs (since I have no DNS server).  I have connectivity (can
ping) each node in the network either by name or by IP.

  Do you have any idea why ntop does not see packets from the other
machines?  Why don't the any hosts populate in the hosts table?  I am very
excited to use this tool.  It seems to be a very powerful tool once I get
the configuration down.  Any help you can provide would be greatly
appreciated.

  Thanks in advance,
  Keith

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