We have several sites in our company that are connected by site to site VPN. Our provider supplies us with very limited reporting. Basically, a graph that shows saturation. I need a tool that will allow me to see at the port who my top offenders are from the perspective of bandwith use. Tool needs to be economical and I need to be able to monitor via remote location.
I do not need to be able to see into the tunnel.
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Once you have access to the traffic, a monitor such as ntop will show you want you want to know.
To gain access, you would need to install a network tap between the edge router and the VPN device. If your VPN device is also your network backbone switch (common in very small sites), you would need to set it up VPN --- tap --- Switch.
GigE or 10/100?
GigE taps are expensive, while you can build your own 10/100 from parts (instructions are @ snort.org) or buy one for a couple 100$US.
-----Burton
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by: giltjrPosted on 2007-08-23 at 18:58:37ID: 19759290
What is the last box that you have full control of? If it is a switch, is is a managed switch?
If managed does it support NetFlow? If it does not support NetFlow, the setup a port mirror on the port that goes to the VPN box.
With NetFlow or a port mirror you can get NTOP (http://www.ntop.org/) and monitor all of the traffic. NetFlow is better because you get traffic summer. With port mirror you get all traffic. Either way NTOP can summerize what is going on.