[e2e] TCP and MAC layer
touch at ISI.EDU
Tue Oct 30 11:20:51 PST 2001
Lloyd Wood wrote:
> On Tue, 30 Oct 2001 Gregory.Maman at space.alcatel.fr wrote:
>>Following your intersting discussion : "What should e2e protocols know about
>>I would have more information about the messages that could be exchange between
>>MAC layer and higher layers (TCP or Application).
>>For example, we can imagine that MAC layer indicates to TCP the available
>>bandwidth allocated for the connection (information available at the MAC layer
>>of a satellite terminal) and will allow TCP to auto-tune his Initial Window.
> I suspect knowing the latency of the path is more useful than the
> next-hop link capacity in this instance. High latency -> larger
> initial window to reduce round-trip time opening window. The question
> is whether you can safely reuse such knowledge from previous
> connections, and generally you can't.
Whether you can or not depends on whether you have data that is a
reasonable predictor. For the average net-connected system, this may not
be true, but for systems on the terminus of a satellite link, this may
be just fine.
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