Is this setup okay for NetFlow

Is this setup okay for NetFlow

We are evaluating NetFlow analyzer, we have setup everything in our router (Cisco 1721) and we are pointing to an IP of a machine inside our DMZ. So the IP is a mapped IP (public<->private).

Is the above setup okay for analyzing. I understand that because we are NAT'd that I will only see the traffic for the egress interface.

In summary here is our setup
DMZ
[Cisco 1721] <------>[NetScreen 204] <-------> [NetFlow system]
(Mapped IP)

Lastly, the speed it is reporting shows last hour on the main dashboard, is there any way to increase the touch point to something like 10mins?








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