Anne, There's some interesting work going on in the Web100 project -- and NCAR is one of the collaborators. See the following for details on providing optimized TCP connectivity; http://www.web100.org/ The LDM would likely benefit from this work. mike On Oct 12, 8:25am, Anne Wilson wrote: > Subject: Re: 20011008: IDD latencies at PSU (cont.) > > ... > The LDM sends in 16K blocks or less. Is this pertainent to "window > size"? And, no, I don't believe there is any dynamic tuning.