Re: Packet loss?

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From: -DC- (DC_at_discussions.microsoft.com)
Date: 01/22/05 

Date: Fri, 21 Jan 2005 17:07:01 -0800

I can try playing around with Windows registry settings next week. But since
I booted off a network boot disk, effectively bypassing Windows altogether,
and still saw retransmits on the network, I'm somewhat skeptical that it's a
Windows problem. Boot disk info is available at http://www.netbootdisk.com/.

"Ed Horley" wrote:

> You might want to look at this:
> http://www.ethereal.com/lists/ethereal-dev/200412/msg00024.html
>
> It seems that "TCP Dup Ack" errors can be attributed to the OS changing tcp
> window sizes. You might want to confirm that you are seeing the same
> results as what is listed. If not, we can do some additional testing to
> narrow things down.
>
> You might want to tune your OS (XP pro/W2K3/W2K) so it performs better for
> window size. There are a ton of sites that tell you have to do this, just
> Google around. There are a lot of other parameters you can set also.
>
> Some light reading on 2003 to get you started:
> http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/networking/tcpip03.mspx
>
> Regards,
> Ed Horley
> Microsoft MVP Server-Networking
>
> "-DC-" <DC@discussions.microsoft.com> wrote in message
> news:AFAF1C80-611B-4A36-9C29-A3112BDACB24@microsoft.com...
> > Hi Ed,
> >
> > The switch is a Linksys BEFSR41 running at 100Mbps Full Duplex. I've
> > already tried all the different settings on the network card (10Mbps and
> > 100Mbps both full and half duplex) with no improvement. I believe I was
> > having this same problem a few months ago with a different switch as well.
> > Right now I have the card forced to 100Mbps FD. Same goes for a second
> > computer on the same switch which is not having any problems.
> >
> >
> >
> >
> >
> > "Ed Horley" wrote:
> >
> >> Need to know what sort of hub/switch you are plugged into, what the host
> >> thinks the speed/duplex is and what the hub/switch thinks the
> >> speed/duplex
> >> is. Often different OS's negotiate differently speed and duplex with the
> >> same NIC so you have to be careful about that. If it is a managed switch
> >> (cisco/foundry/procurve/extreme/etc) try setting the speed and duplex and
> >> doing the same on the host in the OS. If that fixes the problem then it
> >> mostly likely is a auto negotiate issue.
> >> Post back what you have and we can go from there.
> >> Regards,
> >> Ed Horley
> >> Microsoft MVP Server-Networking
> >>
> >> "-DC-" <DC@discussions.microsoft.com> wrote in message
> >> news:7B749090-C6D8-4715-AD31-02FE64FC5AB8@microsoft.com...
> >> > I've got a strange problem with a Dell GX1. For a long time I've
> >> > noticed
> >> > that transfering files between this and another machine took longer
> >> > than
> >> > normal. Eventually I used Ethereal to do a sniff and found that there
> >> > are
> >> > many "TCP Dup Ack" errors on this PC. So I tried installing a
> >> > different
> >> > network card; no change. I booted using a DOS network boot disk and
> >> > copied a
> >> > file to the other computer while doing a sniff. The other computer
> >> > indicated
> >> > several retransmits. I hooked up a laptop to this same cable and got
> >> > no
> >> > errors.
> >> >
> >> > So I've eliminated the network hardware, the NIC, and the OS. What the
> >> > heck
> >> > is the problem? Is the computer simply not keeping up with the network
> >> > card?
> >> > Seems hard to imagine considering the card is built into the
> >> > motherboard!
> >> >
> >>
> >>
> >>
>
>
>

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