Hi all,

Lemme first say : I love NTOP, great work guys! *suckup*

I'm completely new to the list and I have done some searching through
the history but I did not find answers to my questions. (well, perhaps
some that are related) Feel free to flame me if I'm addressing things that
are already know/reported.

I run NTOP (2.0) on my internet router which is a modified RedHat in-
stallation of Linux. I have a nice ADSL connection and I wanted to mo-
nitor all different traffic to my machine.

My internal network is connected to one ethernet interface (eth0) and the
other one is connected to my ADSL modem (eth1). For the actual con-
nection I use PPTP which creates a tunnel through the ADSL modem
which encapsulates PPP. This PPP device is the device I want to
monitor since this will contain all internet traffic. Monitoring the eth1 is
pretty useless since only PPTP traffic goes though that, and I am not
that concerned with my internal network (eth0) either (yet).

When I run NTOP, the first odd thing is that marks my local gateway
as 'High Risk' because it found more than one MAC address for the
same IP. This could very well be, since the host has at least 2 inter-
faces. But isn't it possible to 'tell' ntop to see these as one and mark
it as 'multihomed' ? Also, how does NTOP react to tunneling in
general, has anyone got experience with this ? I even tried to let
NTOP monitor all interfaces so it could correlate, but is doesn't ;)

Another strange thing is that is keeps logging multiple entries for my
external IP address and also adds entries for my external IP address
but then resolved to my external hostname. All with different traffic
satistics. What is causing this ? I saw a previous posting which this
problem but no reply.

And last I would like to know if it is possible to make NTOP masquerade
/NAT aware so it actually can show what NAT sessions are currently
used since now all my internal traffic shows up as if it originated from my
local gateway. I know this is not easy and I will look into this myself
also, but if anyone else is already working on this, please lemme know.

Well, that's it for now.

Cheers,
Martijn Schoemaker


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