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Old 08-28-2016, 05:22 AM   #1
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Why isn't fast retransmit triggered with more than 3 DUP acks

Fast retransmit says that if 3 dupacks have been received by sender, then the sender should retransmit the lost packet. But my tcpdump output shows that it didn't work like this. It didn't retransmit the packet even more than 10 dupacks have been received. Why didn't it trigger fast retransmit? Does anyone has idea about this? Thanks
as the netstat -s show many fast retransmissions, so I am sure fast retransmit works for other sockets. Maybe I had run into a special case.

$ netstat -s |grep retrans
    146963 segments retransmited
    5192 times recovered from packet loss due to fast retransmit
    Detected reordering 42 times using reno fast retransmit
    396 timeouts after reno fast retransmit
    84994 fast retransmits
    60397 retransmits in slow start
    402 classic Reno fast retransmits failed
screen shot in follow link


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