shaper.txt
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上传日期:2013-04-10
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- 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