Hi all,
We use NTA to count the traffic flowing to and from our customer who has a fixed IP address. When we look at the data in NTA so far this month the customer appears to have used a total of 27Mb (in and out). However, the CDR from our network supplier (CDR for those who aren't aware is a bit like our wholesale bill from our supplier) it shows 90 or so Mb. We cannot find the missing traffic. The flows are coming from the Ethernet interface on our router (Netflow v9) and this is the only way our end customer can get to anything, i.e. all of their traffic must traverse this interface.
We have run the same period for other customers and the data is within 1mb of the CDR in every case.
Is there any data that Netflow or NTA cant count? Are their limitations that I'm not aware of? Can it count traffic that is contained within a VPN etc?
Excuse if this is a stupid question, but I would very much appreciate if those with more knowledge than me could explain it.
many thanks.
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