Consistent packet loss with Vista

Discussion in 'Windows Vista Networking' started by Guy, Apr 21, 2007.

  1. Guy

    Guy Guest

    I was noticing odd disconnects running networked application on my laptop
    since installing vista on it. After quite a bit of delving, what I'm seeing
    is this.

    I'm using ping as a way of checking for network connectiveity, it is a basic
    but seemingly effective way of seeing how well I'm connected.

    When I test my connection by pinging a known machine from vista I get a
    pretty consistent 6-12% packet loss as reported by ping. It doesn't seem to
    matter whether I use a wireless card or the builtin wired network card on the
    laptop. Changing the cable doesn't change this result. Another machine on
    the same cable gets 0% loss (it's running xp). Rebooting back to xp on the
    original laptop gets 0% packet loss.

    As far as I can tell, this is affecting two different network cards so I'm
    hard pressed to think that it's a network card driver issue, but I've got no
    clue how to pin this down. Right now my only solution is to switch back to
    xp where this hardware suddenly works perfectly.

    Any suggestions as to how I track this down?

    BTW the machine is up to date as far as windowsupdate is concerned.

    Thanks - Guy
    Guy, Apr 21, 2007
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  2. Guy

    Kerry Brown Guest

    Kerry Brown, Apr 21, 2007
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  3. Guy

    Guy Guest

    Well my home router fails the UPnP test - not too surprising it's not exactly
    brand new. I'll have to test my work routerlater.

    However the test result says that this shouldn't affect basic internet
    connectivity whatever that means, I'm not really sure that a 10%packet loss
    on a basically idle network counts as unaffected.

    If this is a normal response to using Vista on current hardware I'm going to
    be very disapointed since most of the time I have no control over that sort
    of hardware and I didn't upgrade my OS to downgrade my connectivity like that.

    Guy, Apr 21, 2007
  4. Guy

    Guy Guest

    OK so a bit of mucking around later, I've enabled UPnP on my router and the
    router test tool claims that my connection now passes muster.

    Not that this has made any difference, I still get 10% or so ping packet
    loss if I use Vista and 0% if I use XP.

    Any suggestions?

    Thanks - Guy
    Guy, Apr 21, 2007
  5. Guy

    Kerry Brown Guest

    You could try turning off Receive Window Autotuning.

    The article is about firewalls but the setting can cause problems if any
    hardware on the network doesn't support it.
    Kerry Brown, Apr 21, 2007
  6. Guy

    Guy Guest

    I'm afraid that that didn't do it either.

    Not only that, but the command to re-enable the autotuning gives me this

    c:\> netsh interface tcp set global autotuninglevel=enabled
    The parameter is incorrect.

    Apparently the msdn article is out of date, the correct command is:

    netsh interface tcp set global autotuninglevel=normal

    Anyway, thanks for the help trying to work this one out, but still not there

    Guy, Apr 21, 2007
  7. Guy

    Kerry Brown Guest

    I can't think of anything else to try.
    Kerry Brown, Apr 22, 2007
  8. Guy

    Guy Guest

    Anyone else got any ideas? Am I really the only person to see such
    consistent packet loss under Vista? (OK, that's a rhetorical question,
    obviously if lots of others were seeing this it'd have been fixed ages ago).

    Anyway, is there any sort of logging or trace that anyone can think of that
    might help me track this down? I'd hate to just do a re-install in an attempt
    to get the OS to work correctly.

    Guy, Apr 23, 2007
  9. Guy

    Kerry Brown Guest

    What motherboard? Is the LAN card onboard? Is there a BIOS update available?
    You pretty much eliminated everything except the computer.
    Kerry Brown, Apr 23, 2007
  10. Guy

    Guy Guest

    It's a Sony Vaio Sz160p so I'm guessing that it's some Sony motherboard.
    This problem occurs with both the Intel PRO/wireless 3945ABG card and the
    Marvell Yukon 88E8036 on board lan controller. I've not found any BIOS
    updates for them yet. And again, XP works fine on this same hardware, I can
    dual boot it and keep trying both. One works and the other doesn't.

    I'll take another look for BIOS updates though, something might have shown
    up, Sony don't make it particularly easy to find stuff in a timely manner to
    be honest.

    Guy, Apr 23, 2007
  11. Guy

    Kerry Brown Guest

    Kerry Brown, Apr 24, 2007
  12. Guy

    Kim [MS] Guest


    I'm sorry you're experiencing issues. If you're still able to repro the
    packet loss, are you willing to work with us to run some tracing and send us
    the logs so we can check them out?
    Kim [MS], May 4, 2007
  13. Guy

    David R Guest

    I have Internet connectivity for browsing and small file download, however
    anything over 128 kb aprox incurs significant packet loss. I've used Network
    Monitor 3 & MMC Reliability & Performance monitor to capture network traffic
    & Vista performance counters. I am not able to look inside the ISO layers to
    determine where the packet loss is happening. The packets are getting to the
    PC but are being lost or rejected somewhere in the network stack.

    Incoming packets sequences numbers and corresponding ACKs are all good for a
    a short while then the required ACK for a packet is not issued. Shortly after
    a ACK for the previous packet is reissued many times. This is unsuccessful
    then a new request to re-start at a much earlier sequence number is
    requested. This takes some time to sort out. File copy from a XP PC on the
    local subnet also fails.

    I was able to download up to 1 meg a second on my ADSL 2 net connection -
    now I'm down to 80 kbs download & 800 kbs upload. As you can see I'm not
    happy. I was OK until "around" 14th June - Microsoft updates automatically

    I have installed hot fix Windows6.0-KB931770-x86 with no effect.

    I have an xp pc on the same internet connection - it can receive OK.
    Vista has the same behaviour with firewall on & off.
    Outlook is able to download attachments OK, most around 100kb.
    I have switched cables, network cards & PCI slots with no change to packet
    loss in the Vista PC.

    I can reproduce the issue.

    Can anyone help me?
    David R, Jun 25, 2007
  14. David,

    Can you please contact me offline at "sfeng at microsoft dot com"? We are
    interested in getting more details about your issue.

    Stanley Feng \(MSFT\), Jun 28, 2007
  15. Guy

    sw Guest

    I have the same problem as mentioned by Guy in the original post. I have
    tested my router with Microsoft's router test and I pass everything fine
    except the UPnP test, which I purposely have disabled in my router. So I am
    fine there. My packet loss disappears for a little bit if I repair my
    Internet connection. Disabling TCP autotuning doesnt seem to help. Lastly,
    I am hardwired, so it is not a WiFi issue. I went into my XP partition to
    see if I would get the same packet loss at regular intervals. The conclusion
    was that I do NOT experience the same packet loss problem in my XP partition
    with the same hardware. (A8N-E nforce4 ultra motherboard with built in nvidia
    gigabit NIC).

    I am not sure what else to do.
    sw, Jul 20, 2007
  16. Guy

    cirevam Guest

    i have read the post from this forum several times and yet no answe
    have work to fix this problem(which is also problem im facing lately
    .aftere doing some trial and error, i have open my task manager thi
    morning coz i want to end a process, after that i click the networkin
    and i saw that it has two active networking which is the local are
    network and the wireless network, which comes to my mind that i shoul
    disable the wireless network device because im connected direct to m
    modem through wire, after doing that, i tried checking from pingtes
    website, coz i believe and hope that it would make a change to my packe
    loss result , after that my packet result went consistently to 0% ,i
    happy to fix my problem, and i hope others would be happy from what
    have shared
    cirevam, Jan 15, 2010
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