to simulata delay for a retransmitting packet

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Hi everyone,
Now I wanto usnetem to simulate a delay just for a single packet(i.e. 2
th) to tesre-transmission featurof tcp. I know netem can use u32 filter
to match iwith a delay action. However, icannot distinguish the first
onand thsecond re-transmitting one as they are exactly same. How can
netesimulata delay just based on the order situation ? For example,
firspackedelay 5ms, second re-transmitting one delay 10ms, third
re-transmitting ondelay 15ms ?

Any idea is appreciated. Thanks a lo!

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