[altq 1199] Re: traffic shaping (fwd)

[Rémi Guyomarch <rguyom@pobox.com>]

On Sun, Nov 25, 2001 at 02:09:14PM -0500, Nicolas Christin wrote:
> > Machine X ------- A.Router.B ------- Machine Y
> >
> > With AltQ on Router you can shape the traffic going from X to Y and
> > vice-versa, independently :
> > - for streams coming from X to Y, you shape it while it's outgoing on
> > interface Router.B.
> > - for streams coming from Y to X, you shape it while it's outgoing on
> > interface Router.A.
> 
> 	That's understood. But that's almost never the case in a real
> testbed, you always have stuff like
> 
> 
> Machine X1 \                                         / Machine Y1
> Machine X2 - (hub/switch) - Router 1 -  (hub/switch) - Router 2
> ...                                                  ...
> Machine Xn /                                         \ Machine Ym | Router
> k
> 
> 	So, while I agree that you can emulate input queuing with your
> setup, my point is that the type of setup you describe isn't realistic,
> and that in a realistic setup, you can't use ALTQ to shape input traffic.

What's stopping you from doing the exact same thing on "Router 1" ?

As long as you have two interfaces, you can shape incoming traffic as
well as outgoing traffic. In fact in your drawing, there's no 'in' and
'out'... ALTQ on a router let you shape traffic going *through* the
router.

-- 
Rémi