Re: [K12OSN] Network monitoring

[Nils Breunese <nils breun nl>]

Daniel Kuecker wrote:

> Does anyone have a suggestion on an open source setup to monitor  
> network
> traffic? I want to setup a server to monitor the traffic so I can see
> who is going where, what bandwidth is being used, and what services  
> are
> being used. Any suggestion would be greatly appreciated.

You might want to check out ntop (http://www.ntop.org/). From the  
website:

    What ntop can do for me?

    - Sort network traffic according to many protocols
    - Show network traffic sorted according to various criteria
    - Display traffic statistics
    - Store on disk persistent traffic statistics in RRD format
    - Identify the indentity (e.g. email address) of computer users
    - Passively (i.e. withou sending probe packets) identify the  
host OS
    - Show IP traffic distribution among the various protocols
    - Analyse IP traffic and sort it according to the source/ 
destination
    - Display IP Traffic Subnet matrix (who's talking to who?)
    - Report IP protocol usage sorted by protocol type
    - Act as a NetFlow/sFlow collector for flows generated by  
routers (e.g. Cisco and Juniper) or switches (e.g. Foundry Networks)
    - Produce RMON-like network traffic statistics

It is not a very lightweight app, but it is very easy to setup and  
really shows a *lot* of stats. It is distributed under the GPL.

Nils Breunese.

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