I believe I have solved this myself. To elaborate, page 44 in the current 
nProbe_UserGuide.pdf lists sample commands for three modes of nProbe use. The 
command listed for collector mode is "nprobe -nf-collector-port 2055"

Because there is no --nf-collector-port parameter described in the manual, I 
assumed that given there is an em dash used in place of a double dash, perhaps 
it was a misprint, and that it meant "--nf --collector-port 2055". I tried 
adding a --nf parameter to my command, and nProbe behaved differently (appeared 
to override the "-i none" parameter).

I have found this parameter description in an older version of the user guide 
(nProbe and nBox User's Guide v.4.0):
[--nf-collector-port|-3] <port> | NetFlow collector port
and this appears to have been renamed in the latest user guide (v.6.16):
[--collector-port|-3] <port> | NetFlow/IPFIX/sFlow collector flows port

I will submit an issue requesting this be corrected in the user guide.

How the presence of the erroneous --nf parameter was interpreted by nProbe can 
remain a mystery.

> -----Original Message-----
> From: [email protected] [mailto:ntop-misc-
> [email protected]] On Behalf Of Peter Shute
> Sent: Wednesday, 17 August 2016 12:55 PM
> To: '[email protected]' <[email protected]>
> Subject: [Ntop-misc] What does the nprobe --nf parameter do?
> 
> Appendix C of the nprobe user guide specifies the --nf parameter in a couple
> of the example commands. What does it do? I can't see it described
> anywhere in the guide.
> 
> Peter Shute
> _______________________________________________
> Ntop-misc mailing list
> [email protected]
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