[LARTC] questions

[LARTC] questions

[Jay Wineinger]

Hey guys,
    Im going to be setting up a qos system for the college I attend and I
had some questions.  First, the box will be a transparent bridge and I would
like to prioritize traffic (3 class/types only, [interactive, web+mail+etc,
bulk]) and also limit single ips to specified up/down speeds.  I want to use
HTB.
    1)  the network here will have about 500-600 computers on the network,
with 400 active at any one time.  Any ideas on what kind of hardware will be
needed to accomodate this?  They have given me a P-II 350 with 256Mb of RAM
and 2 realtek based 10/100 NICs.  Should this be enough?
    2) What would be the most efficient way (qdisc/class structure) to
accomplish this?  The school's main link is approx 6mbit, yet if I split
that among the anticipated active computers, that would average about 15kbit
per computer, which is terrible.  So, that means if I want to allot any
useful amount of bandwidth to all of the computers, my total alloted
bandwidth would be greater than the link.  Am I correct in my reasoning
here? If so, what would all of you experienced shapers recommend for my
setup? (tree diagrams, descriptions would be great)
    3) iptables marking will not work over the bridge (correct?) so I need
to learn to use u32 filter classifiers.  Are there any in depth howto's, etc
out there?  Im looking at the LARTC page on it and Im still pretty confused.
    4) Anything else I should remember/consider?

Please CC replies to my address shad at wnoc dot com
Jay

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Re: [LARTC] questions

[Stef Coene]

On Monday 08 September 2003 21:02, Jay Wineinger wrote:
> Hey guys,
>     Im going to be setting up a qos system for the college I attend and I
> had some questions.  First, the box will be a transparent bridge and I
> would like to prioritize traffic (3 class/types only, [interactive,
> web+mail+etc, bulk]) and also limit single ips to specified up/down speeds.
>  I want to use HTB.
>     1)  the network here will have about 500-600 computers on the network,
> with 400 active at any one time.  Any ideas on what kind of hardware will
> be needed to accomodate this?  They have given me a P-II 350 with 256Mb of
> RAM and 2 realtek based 10/100 NICs.  Should this be enough?
It depends on the number of active classes you will have.

>     2) What would be the most efficient way (qdisc/class structure) to
> accomplish this?  The school's main link is approx 6mbit, yet if I split
> that among the anticipated active computers, that would average about
> 15kbit per computer, which is terrible.  So, that means if I want to allot
> any useful amount of bandwidth to all of the computers, my total alloted
> bandwidth would be greater than the link.  Am I correct in my reasoning
> here? If so, what would all of you experienced shapers recommend for my
> setup? (tree diagrams, descriptions would be great)
You can try to implement the wrr qdisc.  This qdisc creates a class for each 
mac address (or ip address) and classify's the traffic.  It can "punish" big 
downloaders by limiting the bandwidth.  
http://wipl-wrr.sourceforge.net/

>     3) iptables marking will not work over the bridge (correct?) so I need
> to learn to use u32 filter classifiers.  Are there any in depth howto's,
> etc out there?  Im looking at the LARTC page on it and Im still pretty
> confused. 
You can use iptables on a bridge but you need some extra patches.  See the faq 
page on docum.org.

> 4) Anything else I should remember/consider?
Don't forget to monitor the link so you can check the setup.

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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