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?
Thank you in advance,
Hannes
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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 _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
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/
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 _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
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 _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
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/