We have a network product that runs on Linux and needs to be tested in reduced bandwidth networks. We have been able to use 'tc' (traffic control) in Linux and dummynet in FreeBSD to inject delay (latency) with predictable behavior. But when we try to throttle the bandwidth with either of these, it does not seem to have much effect. Here is an example of trying to use 'tc' to set the bandwidth to 512Kbps: tc qdisc change dev eth0 root tbf rate 512kbit burst 1540 But when we run 'scp' over that connection we see speeds that are way higher than we expect. Here are results of setting various bandwidths in both dummynet and tc. You can see that it has SOME effect but not very much.

Dummynet — traffic shaper, bandwidth manager and delay emulator description The dummynet system facility permits the control of traffic going through the various network interfaces, by applying bandwidth and queue size limitations, implementing different scheduling and queue management policies, and emulating delays and losses. Dummynet ipfw install Hi all, I am new to Ubuntu and Linux, I installed the Ubuntu 9.1 release since for my project I need to use Dummynet that is a part of the ipfw, it is a part of FreeBSD and in this page: http://manpages.ubuntu.com/manpages/.4freebsd.html.

BW _______DUMMYNET__________ __________ TC __________ 10Mbps 1m,3.489s 4.0MB/s 1m,2.732s 4.1MB/s 8Mbps 1m,3.461s 4.0MB/ 1m,2.728s 4.1MB/s 6Mbps 1m,3.905s 4.0MB/s 1m,2.710s 4.0MB/s 1Mbps 1m, 3.261s 4.0MB/s 1m,2.680s 4.0MB/s 512Kbps 1m,26.175s 3.0MB/s 1m 25.409s 3.0MB/s 256Kbps 2m,39.079s 1.6MB/s 2m 53.004s 1.5MB/s 128Kbps 5m, 3.501s 852.7KB/s 5m, 50.491s 739.7KB/s 64Kbps 9m,48.907s 463.3KB/s 9m,53.105s 436.5KB/s I don't have the syntax we've used for DUMMYNET handy but I'll post it later.

Hi all, I am new to Ubuntu and Linux, I installed the Ubuntu 9.1 release since for my project I need to use Dummynet that is a part of the ipfw, it is a part of FreeBSD and in this page: it says that it is possible to add Dummynet/ipfw to Ubuntu by doing this: To compile ipfw into the kernel, place the following option in the kernel configuration file: options IPFIREWALL Can someone guide me through the needed steps for this task? Splinter Cell Psp Iso Espaol more. What files do I need to download and how to compile etc.? Thank you all in advance. Hp Purchasedge Program. I am very new to linux and have recently tried out some different flavors.

A few weeks ago I did setup Dummynet on Debian. Although this tut I created for myself may apply to yours or someones install on Ubuntu and Debian. I have not tried this on Ubuntu but you could pick out the information that matters.

Install Debian • Change PC to boot from cdrom in your bios (usually F2 when you first power on will get you to your bios). • Select Install from the Menu option for basic core install. -or- Optionally you can choose Advanced Option and then Graphical Auto-Install and answers the prompts when given. Departmant Of Licensing.

• Install the following when listed • Standard System • Web Server (optional) • DNS Server (optional) • File Server (optional) • Rest of the prompts are self explanatory - root password, user name and user passwordetc. • Finally the system reboots and you end up at a User login prompt. Once signed in you are at the User Terminal. • OS installation complete. Debian configuration Debian must be configured with a few apts so that you can install Dummynet.