Re: Acking out-of-order packets?


Stuart Levy (slevy@uc.msc.umn.edu)
Fri, 4 Mar 88 09:59:41 CST


Be aware that packets may have other reasons for arriving out of order than
that they've followed multiple paths. One possible strategy for giving
interactive traffic priority over bulk data on a crowded link is to
preferentially forward small packets. I don't know of any specification
that says this shouldn't be done. We've used an Ethernet bridge that actually
does this, and caused a 4.2 TCP bug to be exercised (when a FIN arrived earlier
than some trailing data, the FIN was ignored. The peer TCP had a bug that
caused it to never retransmit a FIN, and so...).



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