congestion window size

[<suvashrestha --at-- wlink.com.np>]

hello

 I am using iperf between 2 freeBSD boxes with a satellite emulator in
 between them to generate multiple streams. The default window size is
 64K, while i need window sizes of around 1M.

 Without the satellite emulator (with window size of 64K) it works fine
 for 100 streams. But when I use the satellite emulator (delay: 500ms;
window size: 1M or 64K) for 100 connections the pipe gets broken and i
 also get a warning saying the default is 64k.

 what should i do???? how do i make window size of 1M in freeBSD??

Thank you in advance