[e2e] Stupid Question: Why are missing ACKs not considered as indicator for congestion?
detlef.bosau at web.de
Mon Jan 29 12:48:47 PST 2007
My apologies for this question, perhaps it´s simple:
In TCP, lost / dropped packets are recognised as congestion indicator.
We don´t do so with missing ACKs.
Consider the following net:
(downstream:) T T T T T T T T T
(upstream: ) AAAAAAAAAA
Then the flow occupies the cumulated capacity of T(CP packets) and A(CK
If CWND grows too large (by probing) and the available path capacity is
exceeded, packet drop occurs.
If a TCP packet is dropped, this is reckognized as congestion
indication. Shouldn´t be a dropped ACK packet seen as congestion
indication as well?
Perhaps, this question is a bit stupid, but I don´t see the clue here at
the moment. Perhaps, someone could help me please?
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