Previous 1 2 3 Next 585 Replies Latest reply: Dec 19, 2007 3:22 AM by Rembert Oldenboom
Akemmeren Level 1 Level 1 (0 points)
This morning i recieved my copy of leopard and installed it on my iMac (core 2 duo 2.16ghz first generation iMac).
And I got 1 big problem,
Airport, with airport i got a very bad connection. When i open several sites at once my ping to my modem shoots up from 2ms to 3k ms and basicly my whole network is useless.

Mac OS X (10.5)
  • nunofgs Level 1 Level 1 (10 points)
    I have been struggling with this issue aswell. It seems to only occur in PowerBook G4 machines. I have tested this with a MacBook Pro and it does not happen.

    IMPORTANT: To find your Wireless Transmit Rate, ALT-CLICK the airport menubar icon.

    Symptoms:
    When you connect to your wireless network, your transmit rate will be 54. (if you're using the 54g standard). If you start up a download or something that occupies your bandwidth (even LAN traffic), you will notice that the transmit rate drops to 11, then to 3, then to 1 until finally your downloads will drop, your ichat connections will fail and your browser will not load pages.

    *My attempts at solving this:*
    - Changed the wireless channel between 1 and 11. DOES NOT FIX THE ISSUE.
    - Changed encryption to shared key/open key. DOES NOT FIX THE ISSUE.
    - Removed encryption. DOES NOT FIX THE ISSUE.
    - Changed DTIM, RTS, Fragment length settings. DOES NOT FIX THE ISSUE.
    - Forced 11b mode. DOES NOT FIX THE ISSUE.
    - Forced transmit rate to 54Mbit/s. DOES NOT FIX THE ISSUE.
    - Downgraded the firmware to an earlier version. DOES NOT FIX THE ISSUE.
    - My access point is a Conceptronic C54APT. There is a hack that allows you to flash it to a D-Link DWL-2100AP. I flashed it and it DOES NOT FIX THE ISSUE.

    Solution:
    - I have another access point in the house (although, it does not reach my entire house, which is why I have the Conceptronic). It is a linksys WRT54G. I can CONFIRM that this issue does NOT occur with the linksys. It works great.
    - Just 30 minutes ago, I remembered that my access point has a hidden feature to boost the transmit power. I boosted it to 24 dBm and for the last 30 minutes, I downloaded over 1GB of data and was not disconnected however the connection is extremely unstable. The download speeds vary between 300KB/s and 1MB/s whereas it used to give me a stable 1MB/s in Tiger.
    - Before you tell me that the problem is my Conceptronic access point, remember that it always worked PERFECTLY in Tiger. (aswell as any other OS or device such as a PDA, a Nintendo DS and a Nintendo Wii)

    *My opinion of what's happening:*
    I believe this is because of the new self-tuning TCP feature. If you alt-click the airport button a few times during a download, you will see that Leopard adjusts your transmit speed so that a more stable connection is possible. This adjustment is what is causing the problem.
    \\
    \\
    Now my question is: *how do I disable the new self-tuning TCP feature?*
  • Akemmeren Level 1 Level 1 (0 points)
    quote:
    "Symptoms:
    When you connect to your wireless network, your transmit rate will be 54. (if you're using the 54g standard). If you start up a download or something that occupies your bandwidth (even LAN traffic), you will notice that the transmit rate drops to 11, then to 3, then to 1 until finally your downloads will drop, your ichat connections will fail and your browser will not load pages. "

    Yep I can confirm this, in my case it's with a WAP54G linksys, not the most cheap accesspoint you can imagine.

    Thanks for the huge post, none of these attempts you tried helped with me either.

    Apple help please.
  • DCYorke Level 1 Level 1 (0 points)
    Also having a problem with my D-Link access point. I would like to add I seem to be having the same type of symptoms with my Verizon Wireless ExpressCard connecting to their 3G network. A couple of odd things in system.log:

    Note: Frequent transitions for interface en1
    network traffic reduction measures in effect
  • tyl3rb1ck Level 1 Level 1 (15 points)
    I to am having airport issues which were not there before leopard.

    On the G4 Powerbook, airport connection drops in and out all the time.
    The same on my G5 iMac.

    Im using a linksys WRT54G as my router in WDS mode with 2 x Airport Express bases also in WDS mode, which has worked flawlessly with Tiger for over a year.

    Gonna hold off putting Leopard on my MacPro until this issue is fixed.

    On a slightly related note i get the same problem of lost network connection and stalls when i connect the g4 and g5 together with IP over Firewire.
  • tyl3rb1ck Level 1 Level 1 (15 points)
    also both G4 and G5 had a Erase & Install, not an upgrade. so the systems are clean.
  • Akemmeren Level 1 Level 1 (0 points)
    Ok i think i solved it ...

    It's a strange solution tho....

    I installed VMwork fusion 1.1 ... lol

    Will let you guys know later if it comes back
  • nunofgs Level 1 Level 1 (10 points)
    I have a PPC machine though. Apple really needs to address this.
  • Akemmeren Level 1 Level 1 (0 points)
    Not completely fixed

    Apple fix please.
  • Brad Carter Level 1 Level 1 (15 points)
    I have VMWare 1.1 installed and my wireless connection is still slow when connected via N to a first gen Airport Base Station. I have an RSSI of -54 which is good, rate is 270 but speakeasy.net speed test says I only have a 499kb/sec download rate. I can get 2500KB/sec down on the hardwired connection.

    When I connect to my G Air Port Base Station then I get good rates.
  • tryu Level 1 Level 1 (0 points)
    I'm having a very serious problem with my wireless connection as well. After installing Leopard, every time I try to download a file that's large (>30MB) I lose the signal. Turning AirPort off and turning it back on will re-establish the connection and resume download, but it will die after about 15 seconds. I have to repeat this process over and over again to finish the download. Has anyone experienced this problem? This problem cannot be reproduced when I boot into Tiger so this must be Leopard specific issue.

    Wireless router: Linksys WRT54GL (latest firmware)
    AirPort Extreme Card installed on the Power Mac G5.
  • nunofgs Level 1 Level 1 (10 points)
    Hi tryu, I have EXACTLY the same problem as you.

    I posted above some of the things I tried, but I neglected to give an example like yours.

    Yesterday I was downloading Firefox (a 17MB file) and it disconnected 3 times. Every time it did, I had to turn off the airport and turn it on again, because it would NOT find my wireless network.
    My Tiger is fine aswell. You are not alone.

    *Apple needs to fix this ASAP. It makes Leopard useless for me.*
  • David Harrison Level 1 Level 1 (0 points)
    Exactly the same issues here.
    Using a fresh install of Leopard on a G4 15" PowerBook with Airport Extreme to a Linksys WRT54G router.
    Connection starts out really good but soon comes to a screeching halt.
    Using a wired connection to the same router works perfectly, so the issue is confined to wireless.

    Like most people I'm thinking the self-tuning TCP is causing issues as no problems have existed previously.
  • Akemmeren Level 1 Level 1 (0 points)
    Not fixed, apple fix please leopard is useless.
  • Scenario Level 1 Level 1 (10 points)
    I too am having problems with AirPort disconnecting every half hour or so. I posted this elsewhere:

    Suddenly after upgrading to Leopard, both Safari and Mail report that Mac OS X isn't staying connected to the Internet. I'm using AirPort and a cable modem and it's always been reliable before. But now there seems to be something jumpy/fishy going on in the AirPort menu in Leopard's menu bar. The list of available networks changes very often and although my own network remains checked, Network Diagnostics shows that I am indeed getting disconnected often and for long lengths of time. But everytime I restart my Mac, my Internet connection is restored.

    I had fully expected BETTER networking in Leopard, not WORSE.
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