Posts:
13
Registered:
Oct 26, 2007
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Airport problem
Posted:
Oct 26, 2007 9:29 AM
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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)
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Posts:
26
From:
Portugal
Registered:
Oct 18, 2005
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Re: Airport problem
Posted:
Oct 26, 2007 10:14 AM
in response to: osxy
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Helpful
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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?
PowerBook G4
Mac OS X (10.5)
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Posts:
13
Registered:
Oct 26, 2007
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Re: Airport problem
Posted:
Oct 26, 2007 10:22 AM
in response to: nunofgs
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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.
Mac OS X (10.5)
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Posts:
7
From:
Texas, USA
Registered:
Oct 26, 2007
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Re: Airport problem
Posted:
Oct 26, 2007 11:06 AM
in response to: osxy
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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
MacBook Pro 2.4GHz
Mac OS X (10.5)
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Posts:
27
Registered:
Oct 1, 2006
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Re: Airport problem
Posted:
Oct 26, 2007 11:16 AM
in response to: osxy
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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.
MacPro CTO & PowerBook G4 CTO(Ali)& iMac G5
Mac OS X (10.5)
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Posts:
27
Registered:
Oct 1, 2006
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Re: Airport problem
Posted:
Oct 26, 2007 11:18 AM
in response to: tyl3rb1ck
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also both G4 and G5 had a Erase & Install, not an upgrade. so the systems are clean.
Mac OS X (10.5)
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Posts:
13
Registered:
Oct 26, 2007
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Re: Airport problem
Posted:
Oct 26, 2007 11:23 AM
in response to: osxy
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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
Mac OS X (10.5)
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Posts:
26
From:
Portugal
Registered:
Oct 18, 2005
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Re: Airport problem
Posted:
Oct 26, 2007 12:53 PM
in response to: osxy
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I have a PPC machine though. Apple really needs to address this.
PowerBook G4
Mac OS X (10.5)
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Posts:
13
Registered:
Oct 26, 2007
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Re: Airport problem
Posted:
Oct 26, 2007 1:47 PM
in response to: osxy
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Not completely fixed 
Apple fix please.
Mac OS X (10.5)
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Posts:
60
Registered:
Sep 17, 2004
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Re: Airport problem
Posted:
Oct 26, 2007 1:48 PM
in response to: osxy
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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.
MacBook Pro
Mac OS X (10.5)
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Posts:
1
From:
Washington, USA
Registered:
Oct 26, 2007
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Re: Airport problem
Posted:
Oct 26, 2007 2:16 PM
in response to: osxy
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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.
Power Mac G5 Dual 2Ghz
Mac OS X (10.5)
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Posts:
26
From:
Portugal
Registered:
Oct 18, 2005
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Re: Airport problem
Posted:
Oct 26, 2007 3:20 PM
in response to: tryu
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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.
PowerBook G4
Mac OS X (10.5)
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Posts:
6
From:
Wellington, New Zealand
Registered:
May 2, 2005
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Re: Airport problem
Posted:
Oct 26, 2007 3:21 PM
in response to: tryu
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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.
PowerBook G4
Mac OS X (10.5)
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Posts:
13
Registered:
Oct 26, 2007
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Re: Airport problem
Posted:
Oct 26, 2007 3:47 PM
in response to: osxy
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Not fixed, apple fix please leopard is useless.
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Posts:
116
Registered:
Sep 2, 2000
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Re: Airport problem
Posted:
Oct 26, 2007 4:30 PM
in response to: osxy
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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.
MacBook Pro 15", iMac G5 20" & PowerBook G4 17"
Mac OS X (10.5)
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