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I'm looking for ways to monitor bandwidth usage for some Linux servers (and a couple of Mac/Windows servers, but if I can only do the Linux servers that will be OK).

I do not control the router that the machines are behind, so I want to install software on each machine that can monitor how much network traffic there is between the machines and the Internet.

i.e. I am not interested in local traffic within the subnet.

I want to know how much traffic there has been per host, incoming and outgoing, per day. Also, I want to be able to see for a particular host how much traffic it has sent to/received from each host on the Internet that it has communicated with (or perhaps top N hosts). It would also be useful to have stats per TCP/UDP port or protocol.

I would like to have the stats available in one place, but if I have to collect them separately and aggregate it manually, I can do that.

I know of various bandwidth monitoring software, but there are so many that I don't know which will be able to provide the above information.

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Take a look at NTOP –  SpacemanSpiff May 2 '13 at 14:17
    
Thanks Spiff. Will have a better look at it. –  Wodin May 4 '13 at 12:47
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