Adam Nellemann wrote:
> Hi Jose,
> Here's the theory behind why inbound shaping doesn't work (or at least
> doesn't work well) If anyone has knowledge to the contrary, please post:
> = = =
> Since there is no built-in "traffic control messages" (or similar) in
> TCP/IP, there is no way for m0n0wall to "tell" the device(s) on the
> "other side" of your WAN link (such as the router at your ISP's end of
> your ADSL line) to stop sending packets (or do so at a slower rate).
To the contrary. The TCP "advertised window" is exactly that control.
When a TCP packet is sent, one of the values in the header is the
number of bytes the sender is willing to receive in return. An ACK
for all bytes and a window of 0 would be very similar to a CTL-S on a
serial link, but varying the size of the window allows a smoother
control of the flow than a simple start/stop.
Chad R. Larson (CRL22) chad at eldocomp dot com
Eldorado Computing, Inc. 602-604-3100
5353 North 16th Street, Suite 400
Phoenix, Arizona 85016-3228
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