After further research, I found that all IPv6 traffic exported by this 
router is being misinterpreted by nfdump/nfsen as IPv4 (and 
misinterpreted IPv6-traffic flow records enter the system in a state of 
total "junk").

It does not seem to be a problem of my setup because IPv6 traffic flow 
records exported from another device (an ASA 5525) are read in the right 
way.

Export of data is correct, and Wireshark is reading flow records 
properly (after configuring data to be decoded as CFLOW) but nfdump does 
not treat the data correctly.

Note: For your reference, IPv6 netflow data is collected using the 
following setup on the router:

    flow record ipv6_record_cisco2
      match ipv6 destination address
      collect ipv6 protocol
      collect ipv6 source address
      collect transport source-port
      collect transport destination-port
      collect counter bytes
      collect counter packets
      collect timestamp sys-uptime first
      collect timestamp sys-uptime last
    !

Please help to overcome the issue.

Thanks,
Nick


On 30/7/2016 2:17 μμ, Nikolaos Milas wrote:

> *They are records referring to IPv6 traffic, misinterpreted as IPv4.*


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