Hi dear ns-users, As I know, the NS-2 Transport API to Application layer does not provide a payload transfer. In NS, Transport only tells to the application: "there is a packet with nbytes that has arrived". But no data is transfered to the app. I want to simulate an application attitude over Manet network and I need the payload of this application to be sent through TCP to simulate well my application's behavior. How can do this please ?! Are there a transport protocol (a variant of TCP for example) which can make a reliable tranfer of a "real payload" ?! Thank you very much for answering my question. regards, Adel Belkhiri. _________________________________________________________________ Windows Live: Keep your friends up to date with what you do online. http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/social-network-basics.aspx?ocid=PID23461::T:WLMTAGL:ON:WL:en-xm:SI_SB_1:092010