asterisk users - Feb 2006 - (newby) Is PING a good indicator of latency?

As the subject line says: Is PING a good indicator of network latency? If
not, how can I measure latency?

Thanks,
Cosmin Prund

Cosmin Prund wrote:
> As the subject line says: Is PING a good indicator of network latency? If
> not, how can I measure latency?
> 
Using Asterisk is a good way. If you define a phone in sip.conf and turn 
on "qualify=", we will measure the latency for the network between the
phone and Asterisk.

/O

On Wednesday 01 February 2006 14:12, Cosmin Prund wrote:
> As the subject line says: Is PING a good indicator of network
> latency? If not, how can I measure latency?
Only if ICMP Echo has the same Class of Service (DSCP, 802.1p, 
priority/class in routers/shapers etc.) as VoIP traffic across the 
network.

-- 
"The PSTN will never be a slave to you. You must be a slave to it."

There is a good utility called iaxping to test IAX latency.

Kind Regards
Garth

BitCo Data Communications
http://www.bitco.co.za


Cosmin Prund wrote:
> As the subject line says: Is PING a good indicator of network latency? If
> not, how can I measure latency?
>
> Thanks,
> Cosmin Prund
>
>
>
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-- 
Garth van Sittert
BSc (Physics & Computer Science)
-----------------
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Email:  garth@bitco.co.za
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> -----Original Message-----
> From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-
> bounces@lists.digium.com] On Behalf Of Cosmin Prund
> Sent: Wednesday, February 01, 2006 6:13 AM
> To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
> Subject: RE: [Asterisk-Users] (newby) Is PING a good indicator of
latency?
> 
> I'm pritty sure VoIP traffic would not be favored in any way along the
> route
> from my first * to my second *, but ICMP might be boosted a bit by my
ISP
> to
> look better :-)
> 
> Thanks
> 
Being an ISP I have to disagree - ICMP traffic is rarely prioritized to
"look better"

Most large ISPs actually LIMIT ICMP traffic to counter ICMP flood DOS
attacks.

That does not make it a good indicator of a networks ability to support
voip. Any cheap ATA will have jitter, delay, and packet loss counters -
hook one up and get the real picture.

If you do use ping to pre-qualify a link, grab a copy of pingplotter so
you can tune the icmp packet parameters and packet rate, run it for a
long time or several times during different timeframes to see if there
are periods of congestion.

> -----Original Message-----
> From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-
> bounces@lists.digium.com] On Behalf Of Olle E Johansson
> Sent: Wednesday, February 01, 2006 5:25 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] (newby) Is PING a good indicator of
latency?
> 
> Cosmin Prund wrote:
> > As the subject line says: Is PING a good indicator of network
latency?
> If
> > not, how can I measure latency?
> >
> Using Asterisk is a good way. If you define a phone in sip.conf and
turn
> on "qualify=", we will measure the latency for the network
between the
> phone and Asterisk.
> 
> /O
Olle

Qualify= runs one SIP OPTIONS per 60 second interval, right? And then
only the latest response is shown.

Not really enough sample points to determine if the network will support
RTP and no provision for jitter measurements and packet loss.

I really like the statistics on the cheap Linksys ATAs! - latency,
jitter, packet loss during an actual call.

Cosmin Prund wrote:
> As the subject line says: Is PING a good indicator of network latency? If
> not, how can I measure latency?
>
>   
The most effective visual indication of network reliability in as far as 
it relates to VOIP is an application called smokeping. The graphs show 
latency as shadows over the ping response which is shown as colours. You 
can see latency, variation in latency, and packet loss in one easy 
display, over 3 hours, 1 day, 1 week.
I can show you this in action is you email me privately.

-- 
Chris Mason
NetConcepts
(264) 497-5670 Fax: (264) 497-8463
Int:  (305) 704-7249 Fax: (815)301-9759 UK 44.207.183.0271
Cell: 264-235-5670
Yahoo IM: netconcepts_anguilla@yahoo.com 


-- 
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believed to be clean.

http://www.voip-info.org/wiki/view/Iperf

Not just latency, but jitter, etc - basically you can simulate various 
types of traffic and generate statistics.  You will need two ends to 
test with.

Cosmin Prund wrote:
>As the subject line says: Is PING a good indicator of network latency? If
>not, how can I measure latency?
>
>Thanks,
>Cosmin Prund
>
>
>
>_______________________________________________
>--Bandwidth and Colocation provided by Easynews.com --
>
>Asterisk-Users mailing list
>To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>
>  
>

On Feb 1, 2006, at 4:24 AM, Olle E Johansson wrote:
> Cosmin Prund wrote:
>> As the subject line says: Is PING a good indicator of network 
>> latency? If
>> not, how can I measure latency?
> Using Asterisk is a good way. If you define a phone in sip.conf and 
> turn on "qualify=", we will measure the latency for the network 
> between the phone and Asterisk.
How do you look at the results of this?

Marty

Martin Joseph wrote:
> 
> On Feb 1, 2006, at 4:24 AM, Olle E Johansson wrote:
> 
>> Cosmin Prund wrote:
>>
>>> As the subject line says: Is PING a good indicator of network 
>>> latency? If
>>> not, how can I measure latency?
>>
>> Using Asterisk is a good way. If you define a phone in sip.conf and 
>> turn on "qualify=", we will measure the latency for the
network
>> between the phone and Asterisk.
> 
> 
> How do you look at the results of this?
> 
Sorry for not mentioning this...

"sip show peers" or "sip show peer <name>"

/Olle