/usr/sbin/ndd -set /dev/tcp tcp_xmit_hiwat 65535
/usr/sbin/ndd -set /dev/tcp tcp_recv_hiwat 65535
Setting these two parameters controls the transmit buffer and receive window. We are tuning the kernel to set each window to 65535 bytes. If you set it to 65536 bytes (64K bytes) or more with Solaris 2.6, you trigger the TCP window scale option (RFC1323).
