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Re: Proposal for PSAMP-PROTO section 6.5.2.6



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...

> 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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