Re: Acking out-of-order packets?


Phil Karn (karn@ucsd.edu)
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).

Phil



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