Re: Re : OpenBSD and dummynet

["Todd T. Fries" <todd@fries.net>]

Out of curiosity, are you actually talking about TCP/IP v4, v6, or are you
exploring scps.org with IPN ?
-- 
Todd Fries .. todd@fries.net


Free Daemon Consulting, LLC                    Land: 405-748-4596
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            Key: http://todd.fries.net/pgp.txt

(last updated 2003/03/13 07:14:10)

Penned by louafi on Thu, Jun 05, 2003 at 06:55:04PM +0200, we have:
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| Thanks for your reply,
| 
| I want to simulate a satellite link to see applications behaviour.
| You said that it's possible. Using pf and altq ? In the past there
| was a randome match but i don't see this option in the pf FAQ.
| 
| Regards,
| 
| Sébastien LOUAFI
| Chef de projet Système, Réseau et Sécurité.
| 
| e-Qual - Avenue du Futuroscope - Arobase 2, Téléport 1
| 86360 Chasseneuil du Poitou - FRANCE
| 
| - -----Message d'origine-----
| De : owner-misc@openbsd.org [mailto:owner-misc@openbsd.org] De la
| part de J.C.Roberts
| Envoyé : jeudi 5 juin 2003 10:56
| À : louafi
| Cc : misc@openbsd.org
| Objet : Re: OpenBSD and dummynet
| 
| 
| On Wed, 4 Jun 2003 18:32:49 +0200, you wrote:
| 
| >Hi,
| >
| >I want to simulate a satelite link with my OpenBSD box. I want to
| >set  up packet loss, response time... like with dummynet under
| >FreeBSD. ALTQ  doesn't permit this configuration. There is an
| >equivalent under 
| >OpenBSD.
| >
| >Thanks
| >
| 
| I was the person who provided the satellite packet dumps for the
| project when they were in need of data to optimize pf. I'm not sure
| if I was the only providing the data, but it's possible.
| 
| I do not know how to set up emulation but the more important question
| to ask is what kind of satellite link are you trying to emulate?
| 
| Actual packet loss is less of a problem than perceived packet loss.
| This is especially true on multiple access systems where some form of
| multiplexing is being used. Latency of .5 to 5.0 _seconds_ makes many
| packets seem to be lost when in fact they are just delayed too long.
| 
| JCR
| 
| 
| 
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