Very Computer

Hi all,

I have the following network setup and would to reduce maximum bandwidth for
one machine, while the other one should be able to use the complete
bandwidth:
I use a Linux box (Kernel 2.4.16, QoS compiled in) to route packets from my
internal network (currently two machines) to the rest of the world (NAT
using iptables). I have an ADSL connection, with 128kbit up- and 768kbit
downstream and would like to limit the up- and downstream for one of my
internal machines. Is that possible w/ QoS? If so, how? If not, is it
possible at all with my current setup or do I need additional hardware?

Thanks for your help,

--Florian Esser

Hi!,

You may want to take a look at the iproute2 package and the ADV-ROUTING-HOWTO
documentation which is available at http://www.linuxdoc.org.  Hopefully, this
will point you in the right direction.

See ya

Dean Thompson

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Quote:> Hi all,

> I have the following network setup and would to reduce maximum bandwidth
for
> one machine, while the other one should be able to use the complete
> bandwidth:
> I use a Linux box (Kernel 2.4.16, QoS compiled in) to route packets from
my
> internal network (currently two machines) to the rest of the world (NAT
> using iptables). I have an ADSL connection, with 128kbit up- and 768kbit
> downstream and would like to limit the up- and downstream for one of my
> internal machines. Is that possible w/ QoS?

Hum. well, the QoS you mention stands for Quality of Service - a small bit
field present in each and every TCP/IP packet

If you want to limit the amount of data that the machine can send out over
the internet, you can either :
- drop everything that you consider 'excess', but your machine won't thank
you for it..;-), or
- regulate the *flow* with which certain types of packets go out of the
machine, i.e. manipulate packet *priority*

This can be accomplished with the shaper package (tc) which lets you
implement limited traffic shaping (as it's generally known)

A good start would be here :
http://www.uwsg.iu.edu/hypermail/linux/net/0010.0/0003.html

good luck !

Yep, thanks a lot Dean and Adaptrx!
After reading your sources I was indeed able to set up a traffic shaper that
fulfills my requirements. And I even finally found out what the MARK target
in iptables is good for =)

Thanks,

--Florian