Hello!
I'm making some simple simulations for long fat networks - the networks with large bandwidth delay product. I'm working on simple Y shaped network, with two senders, chokepoint router and one receiver. My goal is to simulate networks with 100Gbps bandwidths and 100ms delays (all three links have these settings). If I calculated correctly: BDP = 100Gb/s * 0.1s = 10Gb / 8 = 1 250 000 B So there could be roughly 1 250 000 bytes in transit through the network (even more if the queue is full). The problem I'm having is the packets are going through queues on senders. If I run my simulation in nam, I can see packets dropping from the nodes which are actually sending the data (they have TCP and FTP attached to them) because the queues are too small. I'm dealing with this problem by setting larger queues. But on networks with such large BDP, the queues must be 1GB in size (on sender nodes) to avoid the drops in the places where they should not even happen, which slows the simulation down to a halt. Does anybody know how to bypass the sending queues in this matter? Or any other solution to this problem? Please, this is very important to me and I'm getting desperate with it. Thanks for any information. Regards, Andy