local-subnets merely defines how ntop will categorize the traffic.
If you just want to see traffic to/from specific networks, hosts, etc. the 
filter-expression is the right option.

You'll want to check the man page for libpcap to figure out the precise 
expression and don't forget the quotes.

-----Burton


On Thu, 10 Jan 2008, Gregory Machin wrote:
> Hi
> I seem to be battling with ntop .. all i want is to monitor the traffic 
> that passes through my dmz that comes from 2 ip ranges / remote clients 
> .. I need to be able to see how much bandwidth they are using and which 
> protocols / ports are using this bandwidth.

I guess you should just define those 2 ip ranges as local networks 
(option -m or --local-subnets). Or if that is not what you want, you can 
always ignore any subset of traffic using filters (option -B aka
--filter-expression).

> I need graphs of this usage over a number of weeks. How do I do this or 
> is ntop the wrong tool ?

Use the RRD module. But note that ntop primarily provides realtime view on 
the network, rrd graphs don't provide the same level of detail like the 
on-line interface.

-- HH

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