* Re: [LARTC] latency simulation
2002-09-17 14:19 [LARTC] latency simulation Hannes Ebner
@ 2002-09-17 17:10 ` Stef Coene
2002-09-18 8:04 ` Hannes Ebner
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Stef Coene @ 2002-09-17 17:10 UTC (permalink / raw)
To: lartc
On Tuesday 17 September 2002 16:19, Hannes Ebner wrote:
> Hi,
>
> how could I achieve a simulation of Bandwidth _and_ Latency?
>
> In detail, I need to simulate the characteristics of ISDN and DSL on a
> simple Ethernet-Connection:
>
> ISDN 64 Kbit/s und 10 ms latency
> DSL 128 Kbit/s und 50 ms latency
>
> I would use HTB for the limitation of the Bandwidth, but how am I able
> to increase the latency?
Take a look at nist :
http://snad.ncsl.nist.gov/itg/nistnet/
I once tried it and it works.
Stef
--
stef.coene@docum.org
"Using Linux as bandwidth manager"
http://www.docum.org/
#lartc @ irc.oftc.net
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [LARTC] latency simulation
2002-09-17 14:19 [LARTC] latency simulation Hannes Ebner
2002-09-17 17:10 ` Stef Coene
@ 2002-09-18 8:04 ` Hannes Ebner
2002-09-18 8:06 ` Hannes Ebner
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Hannes Ebner @ 2002-09-18 8:04 UTC (permalink / raw)
To: lartc
Hi Leonardo,
> Have a look to tbf. It has a selectable latency parameter that adjust
> the queue length. http://lartc.org/lartc.txt paragraph 9.2.2. Token
> Bucket Filter can give you more information.
from the HOWTO: "...the latency parameter, which specifies the maximum
amount of time a packet can sit in the TBF...".
_Can_ sit in the TBF, not _will_ sit. Therefore it is also possible to
get the packet forwarded with a latency smaller than the one I have
given to the TBF - but I need a method to decrease it to a fixed amount.
Regards,
Hannes
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [LARTC] latency simulation
2002-09-17 14:19 [LARTC] latency simulation Hannes Ebner
2002-09-17 17:10 ` Stef Coene
2002-09-18 8:04 ` Hannes Ebner
@ 2002-09-18 8:06 ` Hannes Ebner
2002-09-18 16:33 ` Stef Coene
2002-09-19 12:48 ` Leonardo Balliache
4 siblings, 0 replies; 6+ messages in thread
From: Hannes Ebner @ 2002-09-18 8:06 UTC (permalink / raw)
To: lartc
Hi Stef,
Stef Coene schrieb:
>>I would use HTB for the limitation of the Bandwidth, but how am I able
>>to increase the latency?
>
> Take a look at nist :
> http://snad.ncsl.nist.gov/itg/nistnet/
> I once tried it and it works.
thank you, a very powerful tool!
Regards,
Hannes
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http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [LARTC] latency simulation
2002-09-17 14:19 [LARTC] latency simulation Hannes Ebner
` (2 preceding siblings ...)
2002-09-18 8:06 ` Hannes Ebner
@ 2002-09-18 16:33 ` Stef Coene
2002-09-19 12:48 ` Leonardo Balliache
4 siblings, 0 replies; 6+ messages in thread
From: Stef Coene @ 2002-09-18 16:33 UTC (permalink / raw)
To: lartc
On Wednesday 18 September 2002 10:06, Hannes Ebner wrote:
> Hi Stef,
>
> Stef Coene schrieb:
> >>I would use HTB for the limitation of the Bandwidth, but how am I able
> >>to increase the latency?
> >
> > Take a look at nist :
> > http://snad.ncsl.nist.gov/itg/nistnet/
> > I once tried it and it works.
>
> thank you, a very powerful tool!
Let me know if it works for you.
Stef
--
stef.coene@docum.org
"Using Linux as bandwidth manager"
http://www.docum.org/
#lartc @ irc.oftc.net
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http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [LARTC] latency simulation
2002-09-17 14:19 [LARTC] latency simulation Hannes Ebner
` (3 preceding siblings ...)
2002-09-18 16:33 ` Stef Coene
@ 2002-09-19 12:48 ` Leonardo Balliache
4 siblings, 0 replies; 6+ messages in thread
From: Leonardo Balliache @ 2002-09-19 12:48 UTC (permalink / raw)
To: lartc
Hi Hannes,
You are right. Thank to Stef for the information. I´ll take a copy too.
Best regards,
Leonardo Balliache
At 06:35 p.m. 18/09/02 +0200, you wrote:
>Message: 5
>Date: Wed, 18 Sep 2002 10:04:36 +0200
>From: Hannes Ebner <he@fli4l.de>
>To: lartc@mailman.ds9a.nl
>Subject: Re: [LARTC] latency simulation
>
>Hi Leonardo,
>
> > Have a look to tbf. It has a selectable latency parameter that adjust
> > the queue length. http://lartc.org/lartc.txt paragraph 9.2.2. Token
> > Bucket Filter can give you more information.
>
>from the HOWTO: "...the latency parameter, which specifies the maximum
>amount of time a packet can sit in the TBF...".
>
>_Can_ sit in the TBF, not _will_ sit. Therefore it is also possible to
>get the packet forwarded with a latency smaller than the one I have
>given to the TBF - but I need a method to decrease it to a fixed amount.
>
>Regards,
>Hannes
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
^ permalink raw reply [flat|nested] 6+ messages in thread