I want to filter the netflow records by engine_id, I have tried

nfdump -r <FILE> engine_id 10


nfdump -r <FILE> -s engine_id 10

But, it is not working.

What do I do wrong?

Here you find the manual for nfdump.

  • 1
    The man page has engine-id instead of engine_id. Try that, and also quote your filter on the command line, which means that the shell passes it to nfdump as a single parameters, instead of one per word. So try nfdump -r "/path/to/file.ext" "engine-id 10" Oct 26, 2015 at 11:18
  • @GertvandenBerg Thanks for the reply. I issued command as you said nfdump -r "nfcapd.201510262034" "engine-id 10", but im getting output like this Date first seen Duration Proto Src IP Addr:Port Dst IP Addr:Port Packets Bytes Flows Summary: total flows: 0, total bytes: 0, total packets: 0, avg bps: 0, avg pps: 0, avg bpp: 0 Time window: 2015-10-26 20:34:49 - 2015-10-26 20:35:51 Total flows processed: 124, Blocks skipped: 0, Bytes read: 6744 Sys: 0.000s flows/second: 124124.1 Wall: 0.000s flows/second: 2530612.2 . Not getting the records(That file has data) Oct 26, 2015 at 11:40

1 Answer 1


I don't know we can filter with engine id in netflow records. I found this LINK. My goal is to differentiate the input OVS port in different servers. From that article, we can differentiate the input OVS ports with combination of "add_to_interface=true”, “engine_id=10”.

In that Article

"There is another use case for Engine ID. As I already explained that OVS uses OpenFlow port number as an In/Out interface number in NetFlow flow record. Because OpenFlow port number is a per bridge unique number, there is a chance for these numbers to collide across bridges. To get around this problem, you can set “add_to_interface” to true."

“When this parameter is set to true, the 7 most significant bits of In/Out interface number is replaced with the 7 least significant bits of Engine ID. This will help interface number collision happen less likely.”

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