nam-src-1.12.tar.gz_nam_nam-src-1.12.tar

***** tahoe-dynamic-demo.txt******* A demo to illustrate the dynamic scenario using tcp tahoe. The topology consistes of 5 nodes 0-2 and 1-2 are fast links sending at 8Mb with a delay of 5ms. 2-3 and 2-4 are slower links sending at 800Kb with a delay of 100ms. TCP connections are setup between nodes 0&3 and nodes 1&3. There is one ftp sources at node 0(brown pkts for data & ack) and node 1(blue pkts for data & ack) each. Routing updates are in black. simulation strats at time 0.5 when src 1 starts sending data to 3. link 2-3 goes down at time 0.824 (shown in red). src 0 also starts to send pkts at time 1.0 to receiver 3. with the link going down src 1 loses the pkts and goes back to slow-start while src 0 rapidly increases the window size and goesinto congestion avoidance phase pumping large no. of pkts into the network.src 1 continues conservatively. with link 2-3 down all pkts are send via 2-4 and 4-3. The link 2-3 comes up at 3.53. with the coming up of link both the sources start pumping data onto the link 2-3. The buffer at node 2 fills up and pkts get dropped for both src 0 as well 1. both go back to TCP's slowstart phase. Here the interesting behaviour of the network to note is that the coming up of link 2-3 actually causes pkts to be dropped as opposed to increasing the efficiency of the network as one would normally assume.