Abstract.

Most traffic in the Internet is controlled by TCP, an algorithm which adjusts the transmission rate of a flow in response to the congestion it perceives in the network. In the core of the Internet, where there are many TCP flows, the aggregate traffic behaves predictably;this is the basis for mathematical modeling of queues and congestion control. I will describe the modeling approach, and what it can tell us about buffer sizing, TCP synchronization, and multipath TCP.