Hi Brian,
On 22/09/14 11:04, Brian Candler wrote:
> I was wondering, is there any reason *not* to pass --enable-nsel in
> latest nfdump, except for size of binary?
For the collector (nfcapd) it makes next to no difference. For nfdump it does,
in that it uses more memory while processing flows, even if non nsel flows are
processed, as some internal structs are pimped up with additional infos, which
remain 0. Furthermore, when enabling nsel, the default output format is extended
to print by default nsel records - however, this can be overwritten of course
>
> In particular:
>
> * Can nfdump --enable-nsel read files previously written by regular nfdump?
Sure! works as expected - except the output format as mentioned above.
> * Can regular nfdump read files written by nfdump --enable-nsel?
Sure! :) except it does not interpret and display nsel records - it skips those.
> * Can nfdump --enable-nsel still correctly decode Netflow V9 from normal
> routers?
Yes - it does. the collector does its magic in order to decide what it is by
searching for the event type in v9. If found it enables the nsell extensions.
>
> Thanks,
Basically all should up- resp. downwards, and sidewise ( with/without nsel )
as good as possible by displaying for what it was compiled and for what the
version is able to decode. Unknows are skipped.
- Peter
>
> Brian.
>
>
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