Hi, I am not shure if I am correct on this list, but maybe someone can give me a pointer... We are running an samba server (3.0.10) on linux (2.6.12.5). Wenn we copy a file from a workstation to the server, we have *very* bad throughput, since we have tcp retransmissions. These retransmissions are causes by a missing tcp-ack, which is not sent by the linux server. This happens occasionally but if, then it happens every time at the last tcp packet of an "Write andX Request" (total about 60k bytes in 40 tcp packets). Here the ack for the last tcp packet is not sent by the server. I cannot see the ack with ethereal. So, it is lost in the server, not on the network... The problem exists, since we upgraded to gigabit ethernet and happens only, if the file is sent from a machine, which has gigabit ethernet too. I cannot see such a problem, if I use ftp. I hope, someone can give me a pointer... Best regards Peter