Old ibook connected to Airport extreme on Intel iMac looses internet.

For the third time in a year since I got my new iMac Intel Core Duo machine the wireless connection between it and my old 2001 ibook (with and external USB --afterthemac.com) wireless device has lost the internet connection for the ibook. I am using the iMac as a airport base station with my iBook and it has worked flawlessly for most of the time since Feb when I got my new iBook but this is now the third time (for no apparent obvious reason to me) that while the System Preferences for the USB wireless device show a 70-75 strength connection via airport my internet (entourage email, safari browser) and wireless printing are all dead.
The last two times it happened I did a permissions fix on the iBook (nothing happened) and then reinstalled the driver for the USB wireless dongle. And I got the internet and printing through the printer on my iMac back. This did not work this time. I am set to Automatic in my Network preferences and am using use DCHP and have an ip address and such that are dynamically assigned. -- that still shows.
I have also rebooted my iMac, stopped and restarted airport on my iMac "base station" (afer a minute) and still no internet but the system preferences still show a wireless connection. I have run out of ideas to connect and wonder what else I a missing but some sites I have looked talk about the mysterious loss of inernet (while wireless appears to be working fine).
What is really weird is I also tested a Zen-Cart-MySQL server running on my localnet of my iMac and I actually got a connection of sorts by my ibook (once) today. It displayed the text portion of my Zen-Cart test screen but no graphics -- did not work next time. So it appears I almost have a connection of sorts with my iMac from my iBook but definately not an internet connection.
One final note, my new Intel iMac is connected to my cable modem via an old Netgear router (which is working fine for the iMac). I do not suspect there is any reason for this to be the problem since the ibook is using the shared connection of the iMac. But thought I would mention.
The ibook as I mentioned is the old 2001 dual USB model (white) it has only about 400 MB ram, a 10GB HD (but works great for email and web browsing for my wife). It has OS X 10.4.4, I have not bothered upgrading it any further because the HD has only about 2 GB of space free and other than this now third time of losing the internet connection it has worked fine and I hate to mess up this email/web machine my wife uses.
So if anyone has ideas of where I can go next to troubleshoot I would appreciate it.
Thanks
Russ Jacobson
[email protected]

Ok appears I solved my problem but not sure why.
While I was posting this around I stumbled on a solution so my question is why. I read somehwere about rebooting the router even thoug it is connected to the iMac and my internet works fine there. Well I rebooted that and the internet for my ibook came back instantly. So since the ibook is sharing the imac connection to my cable modem via rouer using the airport on the iMac why would the router block my iBook and not iMac that is directly wired to the old router (it is not a wireless router)
I want to learn why this now works so I can deal with it more effectively in future.
Thanks,
Russ Jacobson

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I have been having problems with the internet connection via Airport Extreme which I find it a bit unusual and its still driving me nuts! This is what happened:
I have lost my internet connection last Sunday evening upon my return from a weekend away from home. The last time I have used the internet connection on my macbook was the previous Friday morning. Prior to the apparent disconnection on Sunday, I have always used my internet connection wirelessly through Airport Extreme (that is connected via ethernet cable to the NETGEAR DG834v2 ADSL modem which had worked beautifully until the problem arose on my return). This wireless internet connection allowed me to surf the internet anywhere in my home.
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I have been having problems with the internet connection via Airport Extreme which I find it a bit unusual and its still driving me nuts! This is what happened:
I have lost my internet connection last Sunday evening upon my return from a weekend away from home. The last time I have used the internet connection on my macbook was the previous Friday morning. Prior to the apparent disconnection on Sunday, I have always used my internet connection wirelessly through Airport Extreme (that is connected via ethernet cable to the NETGEAR DG834v2 ADSL modem which had worked beautifully until the problem arose on my return). This wireless internet connection allowed me to surf the internet anywhere in my home.
However, upon the successful re-connection to the internet via the modem router, I have discovered several new problems. I have tried to set up the internet connection wirelessly again but instead the following happened:
1. Router (Netgear) drops ADSL connection and cannot reconnect when connected to airport via Ethernet. (which is the case when using airport wireless).
2. Router connects to ADSL fine when computer is connected to it via Ethernet. (However, router disconnects when magsafe power adapter is taken out for some inexplicable reason!)
3. Router connects to ADSL fine when nothing is connected to the router (ie. No Ethernet connections)
4. Router connects to ADSL fine when connected to airport via Ethernet and computer is connected to airport via Ethernet.
So from the above, I cannot connect to the internet properly whether wirelessly or not so I suspect it could be faulty router or could it be airport extreme? I have asked my ISP for an explanation and all they have said is that it cannot be the mis-configuration but could be to do with the power adaptors or the way plugs are set up and suggested I take out all the power plugs (and power surge protector) out to switch everything off, the macbook, router, printer and airport extreme. However, when I have re-plugged them all back in, the problems I have described above still persists!
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Why did Apple stop supporting time machine back-up via USB hard drive connected to Airport Extreme?
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Is it possible to have Time Machine backUp computer HD AND external HD connected to Airport Extreme.
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Hello,
I've been trying to figure this one out for almost 3 weeks now, but with no luck. I have a usb hard drive, connected to airport extreme. I've clicked on "setup time machine", select "choose disk", there is no disk to select. So I click on the "set up time capsule, it takes me to airport utility. I then click on the "disk" button and file sharing is enabled.
I can mount the disk through the finder, just fine and able to transfer files back and forth, however time machine cant seem to pick up the drive. Would love to be able to use time machine to do backups, So can someone please help?
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Thanks in advance!

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