Macintosh PowerBook knocking out Wireless Connection

Hi there, i am pretty proficient with wireless networks and have installed many, loads even with macs, but have never encountered a problem quite as severe as this. Unfortunately the customer is remote, so all i can do is talk through stuff on the phone and reverse VNC to see what is going on.....

The dilemma is as follows:

They've got a Netgear wired router with an inbuilt modem, into that is plugged a Belkin wireless access point. Before you say anything, this setup works fine, they have been using it really happily with 3 Windows laptops which access the access point wirelessly and there is one laptop which is wired into the main router. No problems. They then bought a powerbook and it detects the SSID of the access point, it receives a valid IP address in the range and subnet mask, but the internet connectivity, well, it leaves a lot to be desired. If the mac tries to connect to the access point, the Windows machines ALL have very very limited or sometimes no access immediately after the Mac tries to connect, so it basically knocks them out. But the Mac gets no Internet access either - however, it can get to the router's IP address, that is the actual wired router, so the wireless appears to work!! So why does it cut out the PC's and why if it can see the router configuration page and can access it no problem, is it not shared the internet???

Equipment used:                                 Laptop 1  Laptop 2
DG834 Router |----- Belkin 56G WAP    ---^----------^---------> PowerBook (built in wireless of course)
                     |-----Wired Laptop

I find it unbelievable that the Mac can get right back to the Router, but can't go that one step further onto the Internet, if it can get to the router, then it shared the net surely, this is why it makes me think there must be some simple configuration setting actually on the Macintosh itself, unfortunately, as you probably gathered, i'm not proficient enough on Mac to know where this setting would lie - and yes i've checked the System Preferences > Network > Airport settings, and they are all OK as far as I can see.

Any light on the matter or previous experience with resolution will get the points!


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I may be able to help you on this but you are going to have to provide a little more detailed information.

I need the following..

Lan IP Address of DG834
Lan IP address of the Belkin Wireless Router
Lan IP address getting assigned to the Laptop #1
Lan IP address getting assigned to the Laptop #2
Lan IP address getting assigned to the Powerbook
Lan IP address getting assigned to the Wired Laptop

Also, if you can provide the following for each... Gateway IP address and DNS.  

Do you know which router is setup to give out IP addresses using DHCP?  Is it possible you have both doing this?

henrythackerAuthor Commented:
I set it up so they didn't both act as DHCP servers, however, the router/waps have been reset several times so it is likely that the settings could have been erased, so I will have to verify this. If they have reverted to these settings and there is some sort of IP conflict going on, then you'll get the points, unfortunately i haven't had much time to check it...

The only thing i will say, is if there was an IP problem, it would only relate to the Mac seeing as it is only when the Mac is switched on, that problems happen, so i did try setting a static address up on the Mac, far away from the other devices, something like, and the same problem still occurs.

Will see if I can get all that info for you.
Well this may be true.  But it is also possible that the Mac is getting the same IP address as the wireless router and that may be the root of the problem.  I would suggest hooking the Mac up using a wired connection and see what that gets you.  

This is most definitely in my mind an IP addressing issue probably caused by multiple DHCP servers..

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henrythackerAuthor Commented:
I forgot to mention that the Mac works fine wirelessly... so this could even be a problem despite the fact that i have a static address assigned to the Mac?
henrythackerAuthor Commented:
*WIRED not wirelessly
henrythackerAuthor Commented:
I will get him to log into the WAP and see what settings it has for DHCP.. I assume if it is disabled as a DHCP issuer, it should delegate the DHCP tasks to the router instead??
Umm.. I would like to know a little more about the IP structure before I make any more comments because I would just be speculating and that really will not get us anywhere.  Here is how your system should be set up..

Cable Modem/Router LAN settings should be something like this...
IP Address =

Wireless Router LAN Settings should be as follows
IP Address =
Gateway Address =
DHCP Enabled to serve clients from to

Then set all of your machines to use DHCP and you are done.  If you want to staticly assign IP addresses to the computers do so starting at but do not use - 200.  Also, this is contingent on disabling DHCP from the Cable Modem/Router.

henrythackerAuthor Commented:
From this, it sounds like you are suggesting that the WAP does the DHCP instead? What about the systems plugged hardwired into the router, should i assign static addresses in the range >, or should i not be making the DHCP run on the router instead of the wap?
Exactly.  I would rather have the WAP do it and assign an IP address wirelessly.  When you plug in have it set up with static IPs in the range ->  Just makes things easier.

Let me know how you make out..


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henrythackerAuthor Commented:
Followed your suggestion although hardwired router had to assign DHCP as the WAP is incapable of DHCP tasks, it forwards requests onto its gateway. So reserved blocks for the 3 WAPs which this guys has and started DHCP after the last WAP ip address, so any hardwired or wireless PCs get their IP addresses from the router without any conflict. I was almost there without asking, but thanks for pointing me in the right direction! Cheers
Great... Glad it worked out for you...

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