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Re: WG last call on Sampling and Filtering Techniques until March 12
"recommended" is a rather vague term.
In my view, it should be made clear that in case someone implements the
hash based filtering, he MUST (or SHOULD) implement the recommended hash
function. Otherwise, the whole concept of trajectory sampling, which is
one of the main reason for having hash based sampling, is broken.
From the discussion I saw on the ML I think a consensus on a MUST is
probably difficult to reach, but at least a SHOULD should be in.
Tanja Zseby wrote:
just a small comment: we agreed that it is mandatory to implement one
of the described selection methods to be psamp-conformant. Regarding
the hash-function we just give recommendations if someone decided to
implement a hash-based selection. So to my understanding we will not
have one hash-function mandatory but only recommended. Do you agree ?
Juergen Quittek wrote:
Tanja has submitted a new version of our document on Sampling and
Filtering Techniques for IP Packet Selection. Please find it at
The document in mature enough for entering WG last call.
The call will end on March 12. This allows us bringing up and
discussing comments and issues also at our session in Minneapolis.
Please read the document carefully and comment on it.
PLEASE ALSO COMMENT IF YOU THINK THE DOCUMENT IS FINE.
Positive feedback is as welcome as comment on technical flaws and
There is one open technical issue left that we should continue
discussing and try to close during last call. The document describes
the need to support hash functions for packet selection and for
packet digest. We agreed already, that for each of them one hash
function should be mandatory to implement. Currently it is IPSX for
packet selection and CRC32 for packet digest.
However, a discussion recently started on this list considered
replacing both (as mandatory to implement) by the BOB hash function.
We have not reached consensus on this issue.
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