Re: Beacon OWD/Delay measurements
At 09:56 AM 4/21/2005 +0100, Steve Williams wrote:
> Hi
>
> Thought I sent this a while back - but didn't see it - so just in
> case... here is a question - or three...
>
> 1) Is it still possible to get One Way Delay stats on the beacon
> servers/clients. I'd prefer that to RTT measurements.
>
> 2) What is the status of the RTT bug in the current version?
>
>
> 3) Is there a lightweight client that can be used as with the earlier
> beacon rather than install the whole server?
Hi, Steve -- Sorry it's taken me a while to get back to you. (Things here
have been a bit busy of late. :-) )
1) The Beacon can't supply OWD because the RTP protocol simply isn't able
to support it. We return RTT/2 because that's all we can get.
If you really need OWD, check out OWAMP, at:
http://e2epi.internet2.edu/owamp/
(Once you get your NTP setup configured correctly it works very nicely --
We're currently using it in our Network Performance Advisor project.)
2) We're getting ready to release version 1.2 of the Beacon with a number
of fixes. It's *far* more robust now. We're hoping to have it out in
about two weeks or so. Once that version is out, we'll be addressing the
RTT bug as our very next effort on the Beacon project.
3) Unfortunately, no historic clients exist. As Beacon development
progressed, most version changes also required changes to the Beacon data
format to fix various errors or deficiencies, so an older client would only
be able to talk to a very narrow range of servers anyway.
Hope this helps!
Mitch
--
Mitch Kutzko | mitch@dast.nlanr.net | mitch@ncsa.uiuc.edu | 217-333-1199
Project: http://dast.nlanr.net/ | Personal: http://hobbes.ncsa.uiuc.edu/