RTT Round trip time ?

Hi team,
Have few doubts on round trip time of PING utility.
Actually am not sure how RTT is calculated. i mean min/avg/max values. is there any algorithm available ? please share if any RFC available ?
i know RTT is delay between source and destination ack. i am not sure how MIN/AVG/MAX calculated.
please help me on this.
thanks
rajesh kumar V

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RTT is figured by the sender recording when it sends the ping request and subtracts that from the time when it gets the ping reply. I.e. the delta is the RTT.
Receivers might be slow to process a ping request, so the latency isn't always just network time, it often includes the receiver's processing latency.
(NB: For Cisco's SLA "ping", the receiver immediately records when ping request is received and this usually allows the receiver's processing latency to be eliminated - providing a much more accurate network latency value.)
If you send more than one ping, in a series, the min the is the best/least time, max is the worse/highest time, and avg is the average of the series.
e.g.
If you sent 3 pings and their times were 2,2,2, min/avg/max would be 2/2/2.
If you sent 3 pings and their times were 3,1,2, min/avg/max would be 1/2/3.

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Hi,
We have separate SSID for data and voip in our wireless network.
I have connected my laptop to wi-phone SSID and gave a ping to other laptop IP on same SSID. The round trip time is around 707ms. Sometimes it is reaching more than 1000 ms.
When i connect to my data SSID, the round trip time is very very less around 3 tp 4 ms.
When I try to ping to a phone which is on call, the round trip time is around 50 ms.
Please suggest on how to resolve this issue. Please let me know, if any configuration related information is required.
Regards,
Madhan kumar G

it could be due to power-save enabled on those laptops. Disable it and try.
disable/enable wmm on laptop and try.
Try pinging the phone at off call you may experience high RTT when it is not on call.
ping on WLC is handled as best effort. try file transfer or iperf/jperf.
what's the client(s) rssi and snr when you test.
If the above didn't help check config between the WLANs in question.

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Stephen Rodriguez wrote:You don't need to worry about the round trip between the AP and WLC. Just make sure the phone to phone is goodHTH,
Steve
Please remember to rate useful posts, and mark questions as answered
Thanks Steve,
That makes Sense, as post authentication the phone to phone would be ofcourse less than 150ms when the traffic is locally switched.
But I dont understand why the recommendation in the D&D guide "Roundtrip latency must not exceed 300 milliseconds (ms) for data and 100 ms for voice and data between the access point and the controller"
I think it is applicable if the traffic is centrally switched?? or is there more to it, for roaming perhaps?
Thanks
Jino

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Hi
Can some body explain me what these terms means exactly ? What is their significance ? Appreciate answers without help links.
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kumar

Hai,
Interpretation times: This is the duration from the time that user input actions are validated in the SAP GUI client and the moment the request is actually sent to the SAP application server. This measures the health of the SAP GUI client used for the test rather than the performance of the SAP R/3 server.
Check SAP Note: 364625.
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Regards,
Yoganand.V

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Hi Everyone,
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This post has been moved from the Servers' General Discussion forum to the Solaris 10 forum.
You do not have a question specific to a hardware component of a Sun/Oracle branded server.
You seem to have a general software question that could apply regardless the brand of the computer system.
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Hello Ozzy Vox,
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You can refer to this link that will give you information on 'How to Monitor Websites':
http://azure.microsoft.com/en-in/documentation/articles/web-sites-monitor/
Also refer to this link regarding 'Enable diagnostic logging for Azure Websites':
http://azure.microsoft.com/en-in/documentation/articles/web-sites-enable-diagnostic-log/
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Hi Carol,
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wsConnection.Execute()
Thanks,
Eric
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I'd be curious to know your reasons for this, given
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aiding my
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dls

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Hi Watern,
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Hi,
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RTT Round trip time ?

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