cvs commit: src/sys/netgraph/netflow netflow.c

Bruce A. Mah bmah at
Wed Apr 26 15:19:29 UTC 2006

Maxim Konovalov wrote:
> maxim       2006-04-25 19:56:54 UTC
>   FreeBSD src repository
>   Modified files:
>     sys/netgraph/netflow netflow.c 
>   Log:
>   o Set to zero engine_type, engine_id and pad (cisco calls it
>   sampling_interval) fields in netflow v5 header.  We do not use
>   them but some netflow tools show garbage.
>   PR:             kern/96296
>   Submitted by:   David Duchscher
>   Approved by:    glebius
>   MFC after:      1 week

FYI:  Cisco documents the pad / sampling_interval field in the NetFlow 
v5 header differently in different documents (specifically, in different 
versions of the NetFlow Solutions Guide).  IIRC, an earlier version 
called it "sampling_interval" and a later version converted this to 
padding (I don't know if IOS ever put anything other than zero here, 
however).  This likely accounts for some of the confusion surrounding 
this field.


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