Re: [ippm] I-D ACTION:draft-ietf-ippm-twamp-08.txt

All,

It would be nice if this protocol could operate on hosts which lack a 
NTP/GPS synchronized clock.

I recommend that unsynchronized hosts (sender or receiver) be required 
to set their clock error estimate in the TWAMP-Test Packet to its 
maximum value, 0xFFFF, 65535.  On seeing this value, a program using 
TWAMP would not attempt to calculate one way timing statistics.  One way 
loss statistics would still be possible.

David Scheibelhut

Alcatel-Lucent

Internet-Drafts@ietf.org wrote:
> A New Internet-Draft is available from the on-line Internet-Drafts 
> directories.
> This draft is a work item of the IP Performance Metrics Working Group of the IETF.
> 
> 	Title		: A Two-way Active Measurement Protocol (TWAMP)
> 	Author(s)	: J. Babiarz
> 	Filename	: draft-ietf-ippm-twamp-08.txt
> 	Pages		: 25
> 	Date		: 2008-6-9
> 	
> The One-way Active Measurement Protocol [RFC4656] (OWAMP) provides 
>   a common protocol for measuring one-way metrics between network 
>   devices.  OWAMP can be used bi-directionally to measure one-way 
>   metrics in both directions between two network elements.  However, 
>   it does not accommodate round-trip or two-way measurements.  This 
>   memo specifies a Two-way Active Measurement Protocol (TWAMP), based 
>   on the OWAMP, that adds two-way or round-trip measurement 
>   capabilities.  The TWAMP measurement architecture is usually 
>   comprised of two hosts with specific roles, and this allows for 
>   some protocol simplifications, making it an attractive alternative 
>   in some circumstances.
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-ippm-twamp-08.txt
> 
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