Re: Proposal for PSAMP-PROTO section 6.5.2.6

[Andrew Johnson <andrjohn@cisco.com>]

Youki Kadobayashi wrote:
> This is a minor point..
>
> Andrew Johnson wrote:
> > NOTE: If more than one selection or output range needs to be sent
> > then the minimum and maximum elements may be repeated as needed.
>
> This part talks about both output ranges and selection ranges.
>
> > These MUST make one or more non-overlapping ranges.
>
> Perhaps you are talking about selection ranges here,
> since multiple digest hash functions can take overlapping
> output ranges...

No, I am talking about either selection or output range.  This is
for communicating the ranged of a single digest hash function, so
overlapping ranges do not make sense.  Furthermore, an overlapping
range could just be communicated by sending the larger range, e.g.
1 to 10 plus 5 to 15 => 1 to 15.

Although it is recommended that the range I.E.s are sent in a
sensible order this is not mandated.  As such, the min and max
values could be sent in any order (and a collector MUST cope
with this).  This works OK because there is only one way to
interpret the list as long as there can be no overlaps.

regards

Andrew


>  > The elements
> > SHOULD be sent as pairs of minimum and maximum in ascending order,
> > however if they are sent out of order then there will only be one
> > way to interpret the ranges to produce a non-overlapping range and
> > the Collecting Process MUST be prepared to accept and decode this.
> >
> > The following algorithm specific Information Element MAY be sent,
> > but is optional for security considerations:
> > hashInitialiserValue  - The initialiser value to the hash function.
> >
> > Example of a hash based filter Selector, whose configuration is:
> > Hash Function           = BOB
> > Hash IP Payload Offset  = 0
> > Hash IP Payload Size    = 16
> > Hash Initialiser Value  = 0x9A3F9A3F
> > Hash Output Range       = 0 to 0xFFFFFFFF
> > Hash Selected Range     = 100 to 200 and 400 to 500
>
> Thanks,
>     Youki Kadobayashi
>     WIDE Project
>
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