The FortiOS 5.2.0 CLI reference shows you can configure for netflow export. I asked the exact same question myself recently as 500D is also in consideration.
Use this command to configure sending flow data to a NetFlow collector.
config system netflow
what martinstenner has stated is correct - with that right OS, Fortigate would support NetFlow export and the commands he has listed should work. But the datasheet of Fortigate 500D doesnt list NetFlow support (might be due lower mem on the device or ASIC capability).
I have it on good authority (read: somebody from Fortinet) that this is supported under the OS so doesn't appear device specific. The 500D or 'D' models in general are the newer more powerful appliances with higher ASIC capability that the previous 'C' models.
If in any doubt, I would contact your technical sales representative to confirm these points. It wouldn't be a 'deal breaker' for me though.
Ah perfect. If its OS specific and the device sends NetFlow packets, SolarWinds NTA would work with it.
Thanks all of you for the inputs. Now i have to move ahead to get fortinet500d and hope it fill push all information to our beloved NTA
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