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diff --git a/Documentation/networking/shaper.txt b/Documentation/networking/shaper.txt new file mode 100644 index 000000000000..6c4ebb66a906 --- /dev/null +++ b/Documentation/networking/shaper.txt @@ -0,0 +1,48 @@ +Traffic Shaper For Linux + +This is the current BETA release of the traffic shaper for Linux. It works +within the following limits: + +o Minimum shaping speed is currently about 9600 baud (it can only +shape down to 1 byte per clock tick) + +o Maximum is about 256K, it will go above this but get a bit blocky. + +o If you ifconfig the master device that a shaper is attached to down +then your machine will follow. + +o The shaper must be a module. + + +Setup: + + A shaper device is configured using the shapeconfig program. +Typically you will do something like this + +shapecfg attach shaper0 eth1 +shapecfg speed shaper0 64000 +ifconfig shaper0 myhost netmask 255.255.255.240 broadcast 1.2.3.4.255 up +route add -net some.network netmask a.b.c.d dev shaper0 + +The shaper should have the same IP address as the device it is attached to +for normal use. + +Gotchas: + + The shaper shapes transmitted traffic. It's rather impossible to +shape received traffic except at the end (or a router) transmitting it. + + Gated/routed/rwhod/mrouted all see the shaper as an additional device +and will treat it as such unless patched. Note that for mrouted you can run +mrouted tunnels via a traffic shaper to control bandwidth usage. + + The shaper is device/route based. This makes it very easy to use +with any setup BUT less flexible. You may need to use iproute2 to set up +multiple route tables to get the flexibility. + + There is no "borrowing" or "sharing" scheme. This is a simple +traffic limiter. We implement Van Jacobson and Sally Floyd's CBQ +architecture into Linux 2.2. This is the preferred solution. Shaper is +for simple or back compatible setups. + +Alan |