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Vonage As you point out it is not possible to say that the packets were lost on the last hop,
As you point out it is not possible to say that the packets were lost on the last hop, what you can say is that the packets were lost on their way to the last hop. Because they are lost you never know where the loss takes place you just know the target destination when the loss was reported. Although as the value is high and other hops are low this definitly reinfoces the point. In argumant to that it is also true to say last hop destined packets have the highest exposure for loss because the journey is at its longest point. Secondly a UDP trace and indeed a TCP trace is likely to have issues with the very last hop because it is the last hop and packets never pass through to another hop further along. The way the trace works is that the TTL is set to expire one hop further than the previous hop. This causes an ICMP(note not UDP but ICMP) expire in transit message to return. This means that the trace is is operating is two modes 1. where UDP packets are passing through on their way to another detination (using the HOV lane) and one where this router is the destination and the TTL has expired. In a situation where a UDP packet expires at a hop the transaction is degraded because the router now knows that this packet has failed (no more priority for this packet). I would therefore hazard a guess that there is a considerable delay at the Vonage end of things in hadling failed UDP packets this delay may well exceed the timout of the pingplotter trace hence the packets goe missing.
It would be interesting to try this. 1. Set ping plotter to ICMP to see if the profile of the two traces change. 2 set a simple DOS ping to that destination also :>ping -n 20 64.210.19.18 to compare
Another small point of note is that Pingplotter palces 0-200ms as acceptable, for me it is not, anything over 110 I consider bad, prefereably <100ms is acceptable. Some of your high latenies are very high indeed. Clearly your ISP has issues with 10.53.160.1, thi sis the first hop and it shows unacceptably high peaks appraching 200ms, also 4.71.12.17 is consistently unnaceptable > 300ms on both.
If you take a look at http://205.234.111.216/data.html you will see our measure consistency. The plot high blocks are when the automated Voip test runs (every 5 minutes). Below you will see an intersting time correlation provided by those automated Voip tests, My time-zone is GMT but the data is EST so if you add 5 hours and look at the download speeds and QoS you will notice the impact between the 9-5 business day. by 10am the line degrades < .5mbit by 6pm it is back to normal 4mbit. A clear definition of the baseline and clearly an ISP iproblem tp be solved.
Read The Full Thread: UPDATED: VoIP Speed Test
• I wanted to call your attention to our upgraded VoIP Speed Test .
Instead of
• That is a neat-looking test...but if one's "jitter" tests as "too unpredictable",
• Same issue here, everything looks great(12Mb down, 2mb up, 0 packet loss, however
• Having had a look at the FAQ for this app on the MyVoIPSpeed site it seems to me that
• After you run the test, click on the applet and then press your "i" key. That should
• Well...speaking for myself, I would not be willing to put up with the malfunctioning
• Yes, that number is correct 32k BITS per second!
I know I should put the RT31P2
• ArnB:
You might want to start a new thread for this.
:)
• [quote="trillian"]
IMHO not when the faulty RT31P2 throttles the download
• Ok will do, but I was really wanting to know how to get the Jitter problem fixed-suggestions?
Julianp posted "As you point out it is not possible to say that the packets were lost on the last hop," on 06/10/2006 |
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