in all the documents i see the the sender window (the actuall window) is swnd=min(cwnd,rwnd) but i see in ns2 trace for example 0.20512 0 0 2 1 cwnd_ 7.000 that mean the cwnd is equal to 7, and swnd is also equal to 7 ......so why i tcp send only 2 packets for each recived ack i'm a little bit confused _________________________________________________________________ Messenger Café — open for fun 24/7. Hot games, cool activities served daily. Visit now. http://cafemessenger.com?ocid=TXT_TAGLM_AugWLtagline