Hi evrybody, Did anybody know why FullTcp don't work correctly with the Satellites network ? I am trying to build a simulation like that provided in sat-teledesic.tcl by changing the the udp agent with a FullTcp but there always an error like : FullTcp::recv(_0345) Bad ack(21) to my Syn(1). FullTcp::recv(_0346) god packet lacking ack(21). Thanks for your help. Alioune