Computer Networks

1
Fast Retransmission
TCP Reno
send missing packet
3 dup ACKs
3 dup ACKs
cwnd cwnd 1
ACK
ACK
send packet
send packet
Slow Start
Fast Recovery
Congestion Avoidance
cwnd ssthresh
dup ACK
cwnd cwnd 1
non dup ACK cwnd/2 ( at the start of the Fast
Recovery )
start
timeout
send packet
timeout
start FR
send packet
timeout
Retransmission Timeout
2
Fast Retransmission
TCP New-Reno
send missing packet
3 dup ACKs
3 dup ACKs
send packet
cwnd cwnd 1
dup ACK
ACK
ACK
send packet
cwnd cwnd 1
send packet
Slow Start
Fast Recovery
Congestion Avoidance
cwnd ssthresh
start FR
1st non dup ACK
cwnd cwnd/2
all packets not ACKed at the start of the Fast
Recovery are ACKed
send packet
start
timeout
send packet
start FR
timeout
ACK
send packet
timeout
cwnd cwnd 1
Retransmission Timeout