Hi Michele, yuo can find the answer reading this page http://www.dei.unipd.it/wdyn/?IDsezione=2435
In this page you can find a patch to solve this problem for ns 2.27. If you use a later version of ns, send me a mail with your version. Bye Federico On Thu, 2006-08-10 at 11:56, [EMAIL PROTECTED] wrote: > Hi NS users, > I remove RTS/CTS from MAC 802.11 (setting RTSThresh_ 3000) and now I often > (but not always) > receive this message: > > Scheduler: Event UID not valid! > > and the simulation stop. > Does anybody knows why and how to solve the problem? > > Thanks a lot, > Michele