[LARTC] Modelling a slow [56K connection] to specific computers on a LAN

[LARTC] Modelling a slow [56K connection] to specific computers on a LAN

[Yusuf Goolamabbas]

Hi, I am currently using Linux 2.2.19 and am attached to many other
boxes on a switched 100 Mbit Lan. For some experiments, I would like to
model a 56K dial-up connection to a webserver on one machine [maybe
more] on the LAN. Techniques regarding modelling the speed in the
inbound direction only would be appreciated

I have read [more like skimmed through the Linux 2.4 Advanced Routing
HowTO but am not sure if that is applicable to 2.2 and
scenario's where the machine is not a router but a host]. I am more
familiar with FreeBSD ipfw and dummynet  but don't want to setup a
separate traffic shaper box in bridging mode for this

my question is, Is this possible in Linux 2.2. I don't compile my
kernel's with firewall support. Is this a requirement

Thanks, Yusuf
-- 
Yusuf Goolamabbas
yusufg@outblaze.com

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Re: [LARTC] Modelling a slow [56K connection] to specific computers on a LAN

[Juergen]

> Hi, I am currently using Linux 2.2.19 and am attached to many other
> boxes on a switched 100 Mbit Lan. For some experiments, I would like to
> model a 56K dial-up connection to a webserver on one machine [maybe
> more] on the LAN. Techniques regarding modelling the speed in the
> inbound direction only would be appreciated
>
> I have read [more like skimmed through the Linux 2.4 Advanced Routing
> HowTO but am not sure if that is applicable to 2.2 and
                                        ^^^^^^^^^^^^^^^^^^^^^^
I have tried and it's successful.
But you have to make your kernel to support CBQ
like below
----------------------------------------------------------------------------
--------
NETWORK OPTION
open IP: use TOS valus as routing key
open IP: use FWMARK valus as routing key
open IP: advanced router
open IP: policy routing

NETWORK OPTION --> QoS and/or fair queueing(last option)
<M>CBQ
<M>CSZ
<M>The simplest PRIO pseudoscheduler
<M>RED
<M>SFQ
<M>TEQL
<M>TBF
<*>QoS support
<*>Rate estimator
<*>Packet classifier API
<M>Routing table based classifier
<M>Firewall
<M>U32
<M>Special RSVP classifier
<M>Special RSVP classifier FOR IPv6
<*>Ingres traffic policing
----------------------------------------------------------------------------
--------

And then you can use iproute to add CBQ to your network interface.

> scenario's where the machine is not a router but a host]. I am more
> familiar with FreeBSD ipfw and dummynet  but don't want to setup a
> separate traffic shaper box in bridging mode for this
>
> my question is, Is this possible in Linux 2.2. I don't compile my
> kernel's with firewall support. Is this a requirement
                                                ^^^^^^^^^^^^^^^^

no...it's not the same thing.
CBQ is for the bandwidth management....and firewall support is for the nat
function...


I know that you can use altq to support FreeBSD for bandwidth management.
http://www.csl.sony.co.jp/person/kjc/programs.html#ALTQ



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