Just to answer my own question for any others. I've played around with it a for a few days and it seems the intermediate ORs don't maintain windows, it's only the edge nodes, maintaining a circuit, and individual stream windows.
Hope someone can update the spec to be clearer on this to save others the effort. The offending sentence is: *"The OP behaves identically, except that it must track a packaging window and a delivery window for every OR in the circuit."* Best Gareth On 1 July 2014 09:51, Gareth Owen <[email protected]> wrote: > (sorry re-post - forgot subject) > > Dear all > > I'm working on a tor research project and am having difficulty > understanding the SENDME cells. The tor spec acknowledges that it isn't > particularly clear so I would welcome some clarification please. > > The spec says that *all* nodes in a circuit maintain a send and receive > window, and that this window is decremented on each RELAY_DATA and > incremented on each SENDME. Cells that are neither of these do not affect > the window size. The problem I have understanding is, that only edge nodes > will know whether a cell is a RELAY_DATA, the intermediate nodes only know > that its a RELAY but not what type. So, if only RELAY_DATA decrements the > window size, and intermediate nodes cannot spot these, what point is there > in intermediate nodes having a window? > > Any help greatly appreciated. > > Gareth > > --- > Dr Gareth Owen > Senior Lecturer > School of Computing, University of Portsmouth > > W: ghowen.me > > > -- Dr Gareth Owen Senior Lecturer School of Computing, University of Portsmouth Tel: 02392 846423 Web: ghowen.me
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