Mailing List Archive: ntop LAN problem... help please

ntop LAN problem... help please

Jun 23, 2001, 7:27 AM

Post #1 of 4 (1094 views)

Hi. I just have a quick question... I have installed ntop under win2000 and
it works fine. The only problem I have is that I cannot view the amount of
data downloaded by other machines on the LAN (only the internal data load).
That is, my LAN is configured as follows:

Internet
|
|
Cable Modem
|
|
R o u t e r -----------
| | |
| | |
Comp1 Comp2 Comp3

(each computer is connected to the Router; just in case the lines do not
come out properly...)

I am running ntop on Computer 1. Can you please tell me how to go about
monitoring the amount of data downloaded from the Internet by Comp2 and
Comp3?? All I could get to see was internal data transferred (i.e. from
Comp2 -> Comp1...etc).
Any help greatly appreciated.

Regards,
Damian Kovacevic,
abcf@optushome.com.au

RE: ntop LAN problem... help please [ In reply to ]

dcolquho at opentext

Jun 25, 2001, 6:19 AM

Post #2 of 4 (1098 views)

Permalink

It is most likely that your router has switched interfaces (most home
router/switch combos are exactly that), meaning that each port will only see
its own traffic. It's unlikely that you can configure one port as a
spanning port or monitor port, as is possible on some larger switches.

There are three ways I can think of off the top of my head to get the info
you want: Install Ntop on all the machines, place a hub between the router
and your PCs (hubs brodcast all traffic across all ports) or go SNMP probing
your router and see if you can't pull some interesting traffic values from
it.

> -----Original Message-----
> From: ntop-admin@unipi.it [mailto:ntop-admin@unipi.it]On Behalf Of dk
> Sent: June 23, 2001 10:27 AM
> To: ntop@unipi.it
> Subject: [Ntop] ntop LAN problem... help please
>
>
> Hi. I just have a quick question... I have installed ntop under
> win2000 and
> it works fine. The only problem I have is that I cannot view the
> amount of
> data downloaded by other machines on the LAN (only the internal
> data load).
> That is, my LAN is configured as follows:
>
> Internet
> |
> |
> Cable Modem
> |
> |
> R o u t e r -----------
> | | |
> | | |
> Comp1 Comp2 Comp3
>
> (each computer is connected to the Router; just in case the lines do not
> come out properly...)
>
> I am running ntop on Computer 1. Can you please tell me how to go about
> monitoring the amount of data downloaded from the Internet by Comp2 and
> Comp3?? All I could get to see was internal data transferred (i.e. from
> Comp2 -> Comp1...etc).
> Any help greatly appreciated.
>
> Regards,
> Damian Kovacevic,
> abcf@optushome.com.au
>
> _______________________________________________
> Ntop mailing list
> Ntop@unipi.it
> http://listmanager.unipi.it/mailman/listinfo/ntop

Re: ntop LAN problem... help please [ In reply to ]

nguyen at saigon

Jun 25, 2001, 7:00 AM

Post #3 of 4 (1092 views)

Permalink

Hi Damian,
once the three computers are connected to the same hub, so you can see
the whole traffic. Is it the case?
We are using here an additional program called netaccount. So we can see
all traffic coming from all machines that are connected to the same hub.
Regards,
Vinh Nguyen

Re: ntop LAN problem... help please [ In reply to ]

abcf at optushome

Jun 25, 2001, 7:37 AM

Post #4 of 4 (1097 views)

Permalink

Thanks for the reply. I have managed to monitor traffic without adding a
hub, via the use of remote agents placed on each host I wish to monitor...

Regards,
Damian Kovacevic

At 04:00 PM 6/25/2001 +0200, you wrote:
>Hi Damian,
>once the three computers are connected to the same hub, so you can see
>the whole traffic. Is it the case?
>We are using here an additional program called netaccount. So we can see
>all traffic coming from all machines that are connected to the same hub.
>Regards,
>Vinh Nguyen
>_______________________________________________
>Ntop mailing list
>Ntop@unipi.it
>http://listmanager.unipi.it/mailman/listinfo/ntop