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 > traffic and my > > advertised window is always in the 64k range. > > Are you trying to increase the max window or decrease it? If > you're > trying to increase it, you have to send data faster than it can > be ack'd > by the server to see the effect. If you're trying to decrease > the > window, can you see spots in the TCP stream where your > outstanding data > is greater than the max window? What analyzer are you using?
Yes, decreasing it was the general idea (although I'd like to know how to increase it just for general knowledge). I'm cheap, so I use Ethereal as a PA. I'm not sure I could graph spots or holes using the analyzer (other than just looking at the timestamps I guess). Haven't really thought about it. I was actually shooting a little lower than that. I was planning to use any one of many download benchmarking sites/techniques. The idea was to get an average speed and then tweak the window, so on and so on. > > > I've tried editing the \tcpip\parameters to include > 'TcpWindowSize' and > > 'GlobalMaxTcpWindowSize' - neither of which had any effect. > I've tried > > editing \VxD\MSTCP to include 'DefaultRcvWindow' - also no > effect. > > The VxD thing is a windows-9x specific key and won't be used > (or even > present) on win2000 under normal circumstances. The key is present on my machine but is basically empty. > > > Anyone know how to manipulate the rcv window that my machine > will > > advertise. For that matter, what about the other MS OSes? > XP? Win98? > > the MSTCP key you mentioned is what to use on 9x. > > Our software does this and it works. Also, many broadband > providers publish tech notes on how to do this sort of thing, > since windows typically isn't configured optimally for this out > of the box. I'm beginning to think that 64K is now a default minimum. I've follwed tech notes from both MS and Cisco as well as a few third party folks. None of it worked. I'm going to try cranking it up to see if there is any change in my reported rcv window size. If I do see the change, I'll safely assume there is a 64K minimum or a bug (at least in W2k Pro - I haven't tried it on my XP Pro or XP Family machines). > > Let me know if you need me to dig up code; otherwise, just try > google. Thanks for the info. > > -sd > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=59413&t=59400 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
