Comments on: Simulating low bandwidths: how to make sure your apps work in the field

By: hm

hm — Wed, 01 Jun 2011 12:36:51 +0000

about “using WindowsXP+Dummynet w/ 2 NICs with bridge enabled”
do not use Win XP bridge feature.

This tool can do that instead
http://www.ntkernel.com/downloads/ebridge_x86.zip
I have tested it and it works great.

By: Andymed

Andymed — Fri, 18 Jun 2010 12:42:35 +0000

Hi Chris,

just like David I’m trying to get dummynet running on a Windows machine (WinXP 32 bit) in bridging mode (to avoid necessity of address and/or routing changes to the network the emulation is going take place in.

I’m not experiencing any bluescreens etc, but with the network bridge enabled no traffic is passing the system at all. BTW: with ipfw enabled on the separate NICs (with no bridge in place) everything works fine.

Are there any commands to be issued in ipwf to get the bridge working?

Any suggestions are highly appreciated.

Best regards

Andreas

By: serge-parfait

serge-parfait — Fri, 11 Jun 2010 14:21:56 +0000

the provider (isp) is sopposed to give us 1Mega down and 512 up shared bandwidth.
some time early in the morning i can even open my mail box even i’m alone.

By: chrisw

chrisw — Fri, 11 Jun 2010 12:22:45 +0000

Hi Parfait, hope you're well. You can find the bandwidth management tutorial on the AfNOG Workshop Website. I have videos too, but they need editing before I can publish them. You can follow the instructions in the tutorial, or in the free online Bandwidth Management Book, to measure how much bandwidth you're actually getting, and compare it to what your provider is supposed to be giving you. Cheers, Chris.

By: serge-parfait

serge-parfait — Wed, 09 Jun 2010 11:28:50 +0000

hi chris
i’m reall interrest on your tutorial about bandwidth management were can i get it ?
and i want to know how can i really measure my bandwidth to be sure that i’m paying what i have buy (the bandwidth ).

By: Simulating low bandwidth: in practice « Aptivate | A Blog for ICT4D

Simulating low bandwidth: in practice « Aptivate | A Blog for ICT4D — Tue, 08 Jun 2010 16:10:15 +0000

[...] few months ago, Tariq wrote a great article about how to simulate low bandwidth in your office, to see what it’s like for users with slow Internet connections to access your [...]

By: chrisw

chrisw — Thu, 22 Apr 2010 16:34:35 +0000

David, could you post info about the bluescreen please? Maybe to http://pastebin.ca and just send us the link.

By: David F

David F — Thu, 15 Apr 2010 23:25:07 +0000

Hi Chris et all,

I have been trying this (WindowsXP+Dummynet w/ 2 NICs). Using Windows network bridging to bridge the two NICs – the dummynet service installs to both NICs in the bridge automatically. Everything seems to install fine – then when I run the test.bat file I blue screen. If I undo the bridge and separate the NICs again and put dummynet on just one card, testme.bat works fine – no bluescreen.

Any suggestions?

By: chrisw

chrisw — Thu, 01 Apr 2010 08:53:31 +0000

Hi Vikram, how far did you get on Windows? Did you create a bridge device? Did you install the NDIS driver? Can you run the testme.bat? Can you run the ipfw command? It’s difficult to help you without knowing where you are.

By: Vikram

Vikram — Wed, 31 Mar 2010 23:54:49 +0000

> What about windows and linux?!

>I promise to update this bit with more info when I’ve got Linux, Windows boxes and Chris to hand.

I have been pulling my hair from last couple of days for how to do it on Windows using Windows version of dummynet. So far, I have not been successful. Any idea ..