Hi, I'm very new to Nam, so forgive me if some of these questions sound stupid.
First off, if I create a network using Nam in which there is a TCP entity as a source, with another TCP entity as the sink, in which the source TCP entity has an FTP session on it, if I try to set the start or stop times for FTP and apply them, Nam coredumps with a segfault. I am moderately sure this is not part of the design, and segfaulting is probably not the intended result, but I'm unsure if this is an untrapped error where I'm configuring something incorrectly, or an incorrect understanding on my part on how the connections need to be set up. The second problem is with multicasting. I need to be able to simulate multicasting, I know NS supports it, but I can't find an option in Nam to enable it for the model. Is this something I have to manually insert after designing the system under Nam, or am I missing something in the use of Nam? To go along with that, although I can see unicast UDP as a transport type, I don't see multicast UDP or group membership listed. Are these present but not visible until multicast is enabled for the model, or is Nam strictly an editor for a well-defined subset of NS features? I guess that, for this to make much sense, I need to say that the network I am trying to simulate contains a segment that is both unidirectional and complete, and must provide routing to prevent loops. The remaining network segments, connected to this Grand Central Junction, are all relatively simple but must be able to start/stop other network segments by means of xon/xoff signals. What I am looking for, specifically, is the best editor that I can use to describe such a system in NS' syntax, and a recommended method of doing the rest (NS scripting, C++ modules, etc.) Any suggestions, recommendations, or even examples of existing NS models which do more-or-less what I want, would be gratefully received. Jonathan Day __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
