[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[ippm] Re: comment on http://tools.ietf.org/html/draft-ietf-ippm-duplicate-02

Hi Emile,

Thanks for the comments.

The doc makes a lot of comparison with application behaviors. So, does it make sense to highlight that the doc does not cover the measure of retransmission of packets at the transport level or upper? 

I'm not quite sure if I understand this.  The document describes a way
to quantify duplication that occured between two points.  It doesn't
say anything about retransmission.


Definition of packet arrival count:

The example (with the TTL) should not be in the definition section. 

Moved this to the discussion.

Fields of the header which do not change with the path must/may be part of the identification of a packet. 

I'd say MAY.  What matters is the contents.


Methodoly:
The methodology (section 2.6) of the draft refers to section 2.6 of RFC2680 which speaks about sync of clocks:

Is the sync of clocks really needed for detecting packet duplication? 

No, actually this is one of the things that suprised me as well in
RFC2680.  Does anybody remember why this is in 2680?

Can the timeout correspond to the inter arrival time between the first packet received and the first duplicated packet received? 

No, the idea is that one sets the timeout in advance.


Relation with ITU/T Y.1540:

Are Type-P-one-way-packet-duplication-fraction and IP packet duplicate ratio (IPDR) equal?
Are Type-P-one-way-replicated-packet-rate and replicated IP packet ratio (RIPR) equal? 

Yes, the text says so.

Is there also an equivalent to the singletons definition? 

I don't have the ITU document handy but I don't remember a singleton
definition in there.  (Al, correct me if I'm wrong).

Editorial: 

Fixed.

Henk
--
------------------------------------------------------------------------------
Henk Uijterwaal                           Email: henk.uijterwaal(at)ripe.net
RIPE Network Coordination Centre          http://www.amsterdamned.org/~henk
P.O.Box 10096          Singel 258         Phone: +31.20.5354414
1001 EB Amsterdam      1016 AB Amsterdam  Fax: +31.20.5354445
The Netherlands        The Netherlands    Mobile: +31.6.55861746
------------------------------------------------------------------------------

Is one of the choices leaving the office open?
                                      Alan Greenspan on the next elections


_______________________________________________
ippm mailing list
ippm at ietf.org https://www1.ietf.org/mailman/listinfo/ippm