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Differentiated Services (short: Diffserv) is an architecture for
providing different
types or levels of service for network traffic. One key characteristic
of Diffserv is that flows are aggregated in the network, so that core
routers only need to distinguish a comparably small number of
aggregated flows, even if those flows contain thousands or
millions of individual flows.
Support for Differentiated Services on Linux is part of the more general Traffic Control architecture. A kernel patch is available for 2.2 kernels. 2.4 and late 2.3 kernels already contain the necessary kernel changes. This page contains material about the support for Differentiated Services on Linux, traffic control on Linux in general, and links to sites with related information. |
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Support for Diffserv is already integrated into 2.4 kernels. In order to
enable it, you may have to reconfigure and rebuild your kernel, or at
least some modules. The general
procedure for this is described in the
The Linux Kernel
HOWTO.
The following kernel configuration options have to be enabled in the section Networking options:
The following kernel configuration options should be enabled in the section Networking options, QoS and/or fair queueing:
When the kernel is successfully built and booted, proceed with the instructions in the "iproute2" section just below. |
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Linux Traffic Control is configured with the utility tc. It is part
of the iproute2 package. Some Linux distributions already include
tc, but it may be an old version, without support for Diffserv.
iproute2 is available from many places all over the world, e.g. To build tc with Diffserv support, proceed as follows:
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The Diffserv code for 2.2 kernels is no longer maintained. Several
significant bugs have been fixed in the 2.4 kernel. It is therefore
strongly recommended to use 2.4 instead of 2.2.
You're still reading, so you seem to be determined ... Okay, here is how Diffserv support is added to a 2.2 kernel:
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There is a mailing list for discussion concerning the development and use of
support for Differentiated Services on Linux. You can subscribe and
unsubscribe via the Web interface on
http://lists.sourceforge.net/lists/listinfo/diffserv-general
The mailing list is archived at http://www.geocrawler.com/redir-sf.php3?list=diffserv-general Note: if you no longer want to receive mails from this mailing list, but you don't know how to unsubscribe, just wait a little while. A reminder with all the information you need for unsubscribing (including your list password) is automatically sent every month. |
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Usage information: (nothing at the moment) Implementation details:
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Linux Diffserv: (nothing at the moment) Linux Traffic Control:
Diffserv in general:
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| Last update: 29-MAY-2001 |