Packet conservation At equilibrium, inject packet into network only When one is removed Sliding window and not rate controlled But still need to avoid sending burst of packets would overflow links Need to carefully pace out packets Helps provide stability Need to eliminate spurious retransmissions Accurate Rto estimation Better loss recovery techniques(e.g. fast retransmit) Lecture 19: TCP Congestion ControlLecture 19: TCP Congestion Control 12 Packet Conservation • At equilibrium, inject packet into network only when one is removed • Sliding window and not rate controlled • But still need to avoid sending burst of packets  would overflow links • Need to carefully pace out packets • Helps provide stability • Need to eliminate spurious retransmissions • Accurate RTO estimation • Better loss recovery techniques (e.g. fast retransmit)