There are some strange segfaults in your messages - they may be the cause
of the problem...
However, in order for nfdump to process and save flows in its files, it
needs to understand the flows being sent. The router should periodically
export a flow template packet that describes the fields exported in the
flow. Once that packet is processed, the flows should be recorder.
The export interval for such a packet varies from router to router - can be
every second, or once in 30 minutes.
To see if such a packet is exported, do a packet capture on your server and
load it up in wireshark. Choose Decode As -> cflow and if you can see
individual fields in the packets (e.g destination prefix, counters, etc),
then the template packet is exported. If you don't get granular
information, then the packet was not captured.
Good luck
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