AEBS Dual Band - weird connectionspeeds

Hi folks, hi Apple,
got the new dualband AEBS and I am experiencing following problem(s):
When I set my AEBS wireless setting to automatic, networkutility reports an connectionspeed of 130mbit/s, but when ich trie ro change the setting I get some strange results.
Restarted the AEBS with the setting "N Only 5GHz - b/g " -> 300Mbit/s
Disconnected my MBP and reconnected it -> 54Mbit/s
Restarted the AEBS with the setting "N Only 5GHz - N only 2,4GHz " -> 300Mbit/s
Disconnected my MBP and reconnected it -> 300Mbit/s
(obviously my iphone can't connect)
Restarted the AEBS with the setting "a/n - g only " -> 300Mbit/s
Disconnected my MBP and reconnected it -> 54Mbit/s
Am I doing something wrong or can anyone confirm this?
And by the way, when I trie to play a homemovie which is stored on my airdisk it now stutters this didn't happen with my previous AEBS... In iStatpro it seems that the connection breaks down vom 5mb/s to 0kb/s every few seconds and gets immediately up again.
and my bootcamp xp installation also can't connect to the dualband network, just to the guestnetwork I set up...
Help would be appreciated!
P.S. Sorry if I made any mistakes, english is not my first language.
Greetings
Dave

Thanks for your post!
The video playback stutters with N 5Ghz 300mbit/s, N 2,4GHz 130mbit/s and G 54mbit/s.
What I also noticed on every band and connections speed:
When I copy a file from my airdisk to my MacBook, iStat pro shows my the incoming speed and it goes something like this:
3mb/s, 4mb/s, 0kb/s, 3mb/s, 4mb/s, 0kb/s, 3mb/s, 4mb/s, 0kb/s and so on.
So it seems that the connection breaks down and goes up right after that.
I think this why the movie stutters and why the speed isn't what it should be...

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A little history:
We have 3 iMacs (new 3.06 Ghz, 17" late 2006, 20" late 2006), 3 MacBook Pros, and one dual-2.5 Ghz G5 that all shared internet access through a Motorola modem/Comcast cable via an Airport Extreme Base Station b/g. The AEBS was in the basement and configured as a WDS with an Airport Express b/g that served to extend the network's reach to the second floor and remodeled kitchen (new steel beams). This setup has worked nearly flawlessly for years until recently, when both of the older iMacs started experiencing intermittent airport signal drops--supremely annoying. The modem seemed to work fine, however, and the AEBS light stayed green and the G5 and MBPs weren't having issues (some running Tiger, some Leopard).
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cable modem ------>
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I've tried so many different settings, combinations, configurations trying to get this up and working, that I'm ready to pull my hair out. Any help will be greatly appreciated!
Message was edited by: wiswic

Thanks for your reply. Looking back at my sorry attempt at a diagram, I realize I wasn't clear about a couple of things. The modem is connected via ethernet to the AEBS-n. The AEBS-n is connected via ethernet to the AE-b/g, which provides wireless coverage to the G5 and others. So far, everything is in the basement.
We live in an old house--no way to set up the network via ethernet--and so rely on the airport network to provide internet access to the computers on the first and second floors. In our old network, I had an AE-b/g as a WDS remote located in the kitchen that provided the first and second floors with their internet connection.
When I upgraded our network, I set up the new AEBS-n as a 5.0 Ghz an-only network (create a network/allow network to be extended) and connected the old AE b/g to it (bridge mode/create a network) to provide wireless internet for the G5. The iMac in the kitchen could hardly pick up the "n" signal at all, and it could receive only a weak signal from the b/g network. Lots of dropped airport signals and also lots of dropped internet connections. Strangely enough, the MacBookPros on the second floor could pick up both signals pretty strongly, but they, too, had lots of drops. The 2nd floor iMac was even worse than the kitchen iMac--spotty reception at best, and lots of drops. The G5 and the iMac in the basement, meanwhile, were fine--strong signal and only intermittent drops.
Hoping to extend the reach of the "n" network and thereby eliminate the drops, I added an AE-n to it (bridge mode/extend the network) and put it where the old b/g had been. This boosted the "n" signal to the kitchen and 2nd floor, but the drops seemed to become more frequent and for longer durations. Perhaps this was merely coincidence, but it made me question whether adding the AE-n in a dual-band network was advisable. Not finding any info that specifically addressed that scenario, I turned to the discussion forum for guidance.
Further research leads me to believe that the iMacs' issues may be more due to their being iMacs in the first place, but I was still left with a very unreliable dual band network for the rest of the Macs. Reconfiguring the AEBS-n and AE-n as an n (b/g compatible) network has led to far fewer drops, but like you, I'd prefer to keep my "an" devices separated from the G5 to make use of their higher wireless speed.
So....I guess what I need to know is whether anyone else been having so many dual band dropouts? Have you had any success in eliminating them? Have you successfully extended the "n" side of their dual band without adversely affecting stability?
As long as I know this isn't a lost cause, I'll give it another go and keep tweaking settings in hopes of finding a stable setup....

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I think I found the problem. I've solved it, and now it's working really rock solid.
And yes, the latest version of the 802.11n base stations (the dual band II) has indeed an enhanced radio subsystem.
I was advertising a 802.11n network on 2.4 GHz as well, and I think that the remote base station, which doesn't have a choice to select 2.2 or 5 GHz, and relies on finding the main base station, was somewhat confused.
After setting it to 802.11n (5 GHz) and 802.11b/g (2.4 GHz) it's working like a charm.
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I have the newer Airport Extreme Base Station, with N capability, before it supported Dual Band. I also have an Airport Express. What I want to do is broadcast a network in my home with 5GHz for my Macbooks and a second network on the AE at 2.4GHz for everything else. I've tried many times to get this to work, and I keep getting the error message that the DHCP overlaps with the AEBS. What should I do? I know this can work somehow.

Hello Rad Mac. Welcome to the Apple Discussions!
Setting up a "dual band" network is described in the Designing AirPort Networks document, starting on page 48. Please check out the document and post back if you still have any questions.

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I have connected an external 500GB hard drive to the AEBS for the purpose of using Time Machine for the Macbook and MacMini. The Airport Utility shows the external drive connected to the AEBS, but when I try to configure Time Machine for the Macbook and MacMini I am only allowed to select the Time Capsule as the destination. Sorry for the long post. Any help would be greatly appreciated

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If you are interested in proceeding with your plan, check these links out:
http://discussions.apple.com/thread.jspa?messageID=8225748&#8225748
http://discussions.apple.com/thread.jspa?messageID=8650723&#8650723
http://jamesshore.com/Blog/How-to-Accelerate-Time-Machine.html

Why does the new Dual-Band AirPort Extreme Base Station act as a proxy?

The previous thread
http://discussions.apple.com/thread.jspa?threadID=1531675
has been archived and nothing came of it, but after testing, I'm certain that their findings are true.
The Dual-Band AirPort Extreme Base Station (AEBS) with firmware 7.4.1 acts as a proxy for TCP ports 21, 554, and 7070 when NAT is turned on. This can be verified by using Nmap on any external server known to NOT have the ports open and having Nmap return that the ports are open. You can telnet to these ports to verify that they're "open," even though they are not on the server.
This functionality appears to be undocumented and as far as I can tell, the only way to turn it off is to put the AEBS into bridge mode and having some other device do NAT further upstream.
As a computer professional, this functionality extremely undesirable, particularly since it is not documented and doesn't have an "off switch." I wasted a bunch of time with one of my network engineers because of this, thinking that some network router was spoofing our server. I also wasted a bunch of my time trying to detect whatever "stealthy rootkit" had opened a FTP server and some other botnet related ports on our server, when in reality, it was simply my AEBS tricking me.
Disabling NAT-PMP ("Enable NAT port mapping protocol") does not affect this.
Is it too much to ask to have a checkbox in the "Advanced" section of the AirPort Utility to turn this feature off?

Welcome to the discussions forum Michael Bennett2.
Thanks for investigating this odd behavior.
If you want your work to be noticed by those who can effect change, you'll have to tell Apple via their feedback link. It won't do any good to post it here.
http://www.apple.com/feedback/

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