On 02/16/15 14:31, Lawrence Stewart wrote: [snip] > In a nut shell, the first 3 dup acks trigger the sender to fast > retransmit, reset the retransmit timeout (RTO) and enter fast recovery The above should read "reset the retransmit timeout (RTO) timer" i.e. the timer starts counting down from the RTO value. Cheers, Lawrence