Re : OpenBSD and dummynet

["louafi" <sebastien.louafi@e-qual.fr>]

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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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