Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread s vermill
On a W2k machine, I've tried several different recommendations for adjusting the TCP receive window size. None of them, including those directly from Microsoft, seem to have any impact. I'm capturing my own traffic and my advertised window is always in the 64k range. I've tried editing the \tcpi

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread Marc Thach Xuan Ky
Are you trying to make the window smaller? rgds Marc s vermill wrote: > > On a W2k machine, I've tried several different recommendations for adjusting > the TCP receive window size. None of them, including those directly from > Microsoft, seem to have any impact. I'm capturing my own traffic an

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread s vermill
Marc Thach Xuan Ky wrote: > > Are you trying to make the window smaller? > rgds > Marc Yes. I was hoping to set up a demonstration on the impact of high bandwidth*delay product networks without actually having a high bandwidth*delay product network. By artifically enforcing a small rcv window,

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread Steve Dispensa
On Tue, 2002-12-17 at 14:34, s vermill wrote: > On a W2k machine, I've tried several different recommendations for adjusting > the TCP receive window size. None of them, including those directly from > Microsoft, seem to have any impact. I'm capturing my own traffic and my > advertised window is

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread s vermill
Steve Dispensa wrote: > > On Tue, 2002-12-17 at 14:34, s vermill wrote: > > On a W2k machine, I've tried several different > recommendations for adjusting > > the TCP receive window size. None of them, including those > directly from > > Microsoft, seem to have any impact. I'm capturing my own >

RE: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread Larkin, Richard
: Perhaps O/T: Window TCP Rcv Window [7:59400] Marc Thach Xuan Ky wrote: > > Are you trying to make the window smaller? > rgds > Marc Yes. I was hoping to set up a demonstration on the impact of high bandwidth*delay product networks without actually having a high bandwidth*delay pro

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread Marc Thach Xuan Ky
Scott, A clue from this webpage: http://www.psc.edu/networking/perf_tune.html Describing Win98 it says "DefaultRcvWindow is a string type and the value describes the default receive windowsize for the TCP stack. Otherwise the windowsize has to be programmed in apps with setsockopt." Perhaps the app

RE: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread s vermill
sier in that world. It's on my list of technologies to master. Sigh... > > -Original Message- > From: s vermill [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, 18 December 2002 6:40 AM > To: [EMAIL PROTECTED] > Subject: Re: Perhaps O/T: Window TCP Rcv Window [7:5940

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread s vermill
Marc Thach Xuan Ky wrote: > > Scott, > A clue from this webpage: > http://www.psc.edu/networking/perf_tune.html > Describing Win98 it says "DefaultRcvWindow is a string type and > the > value describes the default receive windowsize for the TCP > stack. > Otherwise the windowsize has to be program

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread Marc Thach Xuan Ky
e 64kbps. > > Rik > > -Original Message- > From: s vermill [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, 18 December 2002 6:40 AM > To: [EMAIL PROTECTED] > Subject: Re: Perhaps O/T: Window TCP Rcv Window [7:59400] > > Marc Thach Xuan Ky wrote: > > > >

RE: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread s vermill
s vermill wrote: > > Group: > > On a W2k machine, I've tried several different recommendations > for adjusting the TCP receive window size. None of them, > including those directly from Microsoft, seem to have any > impact. I'm capturing my own traffic and my advertised window > is always in th

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread Priscilla Oppenheimer
Well, "theory" says that the receive window size is based on how much memory a host has. If it has very little memory, then it has to make sure the other side doesn't send too much data without giving the host breathing time to flush its buffer, write to disk, and ACK. So a host has to advertise a

RE: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread Priscilla Oppenheimer
s vermill wrote: > > s vermill wrote: > > > > Group: > > > > On a W2k machine, I've tried several different recommendations > > for adjusting the TCP receive window size. None of them, > > including those directly from Microsoft, seem to have any > > impact. I'm capturing my own traffic and my

RE: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread Steve Dispensa
> An interesting side note: Ethereal apparently doesn't support window > scaling. Do you mean the tcp window scale option or just the phenomenon of having data outstanding? You can always just count un-acked bytes for an idea of how big the window is. It's dyanmic, of course, and don't forget

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-17 Thread Steve Dispensa
> So one wild idea would be to remove memory from the host. Or maybe you could > get it to use up a chunk of memory by opening lots of large docs and/or > using a RAM disk!? In practice, you'd have to really restrict the amount of RAM to a level that the OS wouldn't function. You're talking about

Re: Perhaps O/T: Window TCP Rcv Window [7:59400]

2002-12-18 Thread Richard Deal
To all, There is a freeware program called Dr. TCP Win for Windows 2000/XP that allows you to change both the MTU and TCP Window size--requires a reboot, though, after the change. Cheers! -- Richard A. Deal Visit my home page at http://home.cfl.rr.com/dealgroup/ Author of Cisco PIX Firewalls,