Phil Karn (email@example.com)
Thu, 3 Mar 88 08:15:54 PST
Nothing really "depends" on those do-nothing ACKs, in the sense that the
protocol still operates correctly even if they are lost.
I should probably let Van describe his own technique, but basically it
involves interpreting a flurry of do-nothing ACKs as an indication that
an early packet was lost. This triggers a retransmission before the timer
would ordinarily expire and do it.
This appears to be a big performance win over networks with large
bandwidth*delay products (e.g., the Wideband net).
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