Error setting up Internet Connection Sharing

Dell / INSPIRON 1420
October 20, 2010 at 12:48:10
Specs: Microsoft Windows 7 Ultimate Edition, 1.66 GHz / 2GB
I'm trying to set up internet connection sharing so that I can plug my xbox 360 into the ethernet port of my netbook and use the WiFi. I'd done this before, and it worked fine, the exact same setup and configuration, but now I'm having a problem with it. When I try to enable ICS on the wireless adapter, I get this error:

"An error occurred while Internet Connection Sharing was being enabled. Internet Connection Sharing cannot be enabled. A LAN connection is already configured with the IP address that is required for automatic IP addressing."

I'm not sure why I'm getting this error, I haven't changed anything on the network set up. It works fine when I use my other laptop for ICS, but not on this one. I tried restoring the router to factory defaults and setting up the netbook on it first, but no good. I have the Bell white 2Wire modem/router. My IP settings are as follows:

Router DNS/Default Gateway/DHCP - 192.168.2.1
LAN Address (for the netbook's WiFi on the network) - 192.168.2.24
Subnet (for the netbook's WiFi on the network) - 255.255.255.0
Subnet for Ethernet adapter on netbook - 255.255.0.0

I'm using a Dell Inspiron Mini 1012 netbook running Windows 7 Ultimate.

Any help is greatly appreciated!

Thanks,
Paul

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#1
October 20, 2010 at 13:03:51
this a mistype?
Subnet for Ethernet adapter on netbook - 255.255.0.0

don't you mean 255.255.255.0?

ICS will want to assign 192.168.0.1 with subnet mask 255.255.255.0 to the lan side interface.

You say you set this up before. Did you undo it previously?


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#2
October 20, 2010 at 13:07:44
Yes, I did undo it previously. And the subnet for the Ethernet adapter is 255.255.0.0, I wondered if that was the problem, but I couldn't find a way to change the subnet.

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#3
October 20, 2010 at 13:41:05
http://support.microsoft.com/kb/306126

Did you follow the above steps?

Subnet needs to be 255.255.255.0 or on the connected pc set it to 255.255.0.0 so the two can communicate.

Not sure why you get 255.255.0.0 I know there is a regedit that can change the default ICS subnet range. Did you do this change in the past?


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#4
October 20, 2010 at 13:58:38
No, the subnet on the wired adapter is 255.255.255.0. I found this using ipconfig /all.

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#5
October 20, 2010 at 14:30:41
link shows nothing. your statement is confusing.

are you correcting your previous statement that the wired adapter is NOT at 255.255.0.0 but really at 255.255.255.0?


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#6
October 20, 2010 at 14:36:10
Sorry, THAT was a typo, the subnet on the wired adapter is 255.255.0.0
The subnet on the wireless adapter however is 255.255.255.0

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#7
October 20, 2010 at 14:53:13
I thought maybe I should also add that the laptop that does run ICS without problems has a little note under it's name when I connect to the router that says "DMZplus enabled". When I view the device details, it also shows the following:

Connection Type: Wireless (802.11)
IP Address: 74.14.21.107
IP Address Allocation: DHCP
IP Address Type: DMZplus
Hardware Address: c4:17:fe:b8:95:8f

Whereas on the netbook, it says this under device details:

Connection Type: Wireless (802.11)
IP Address: 192.168.2.24
IP Address Allocation: DHCP
IP Address Type: Private (NAT)
Hardware Address: 00:26:4d:ac:08:91

I'm not sure if this is relevant...

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