My Windows XP (SP2) laptop connects to a wireless network, and I would like another laptop to connect to the internet through Internet Connection Sharing in Windows XP.

In the XP laptop's wireless network connection property, under advanced tab, I selected "allow other network users to connect through this computer's internet connection". Then there is an error: "Internet Connection Sharing cannot be enabled. A LAN connection is already configured with the IP address that is required for automatic IP addressing."

I googled a little, and someone said:

ICS wants to assign to the LAN connection. It can't do that, because the wireless network is already using the 192.168.0.x IP address range. The Internet connection and the LAN must use different ranges.

To use ICS, change the wireless network to a different address range, such as 192.168.1.x.

If this is the solution, I wonder how to "change the wireless network to a different address range, such as 192.168.1.x."? Does it mean that I have configure the router or modem of the wireless network? How to do that without having access to the router or modem physically? I also don't have password to configure that router.

If this is not the solution or there may be other possibilities, for example without configuring the router of the current wireless network, please let me know as well. By the way, I have another router available if that may help.

Thanks and regards!

  • 2
    If I read that correctly, you'd have to change your WiFi router's network to 192.168.1.X, correct. You wouldn't need physical access, just enter your router's IP in a browser and change the settings there. – slhck May 8 '11 at 16:34
  • @slhck: Thanks! my internal ip is What is my router's internal IP? – Tim May 8 '11 at 16:51
  • 1
    @Tim In most cases, it's If not: run ipconfig and you'll find your router's address under "gateway". – slhck May 8 '11 at 16:55
  • @slhck: Thanks! I don't have admin password to change its WiFi network. So I think this way seems impossible now. Is it possible to buid ICS without changing the router? – Tim May 8 '11 at 17:48
  • Couldn't you just use 192.168.1.x for the LAN? Or does ICS not let you specify the IP range? – user55325 May 8 '11 at 19:05

Call your service provider for the router's password and for support changing your DHCP range. If they won't support you, ask for the default settings needed for your connection and write them all down.

Then do an Internet search for your router's default password. If you still can't get in using the default and you have no other way of recovering the existing admin passoword, search for instructions for resetting your router to factory default. After the reset, the default password will work and at that point you will be able to reconfigure it from scratch, using a 192.168.1.x range for DHCP.

Good luck!

  • I am not the admin of the wireless network, and it is unlikely the admin will change the router for me. So leave me few choices: find some way that does not require configuring the router, or learn how to hack the router which I don't know yet. – Tim May 8 '11 at 21:48
  • Ah, I understand. You should probably break down and buy the other laptop a wireless adapter if you don't have admin rights to any of the network equipment; it would most likely be the fastest solution. – goblinbox May 8 '11 at 21:53
  • My actual problem is superuser.com/questions/277108/…. The only way I try now is to get around the problem by superuser.com/questions/280618/…, for which creating ICS is just the only way I know to solve it, but it looks like impossible without configuring the router. – Tim May 8 '11 at 22:00
  • So if you can't change the IP range on your local DHCP server, why don't you change the range in ICS instead? The instructions for doing so are at the MS kb. – goblinbox May 8 '11 at 22:08
  • 1
    Subnet should be the default, which will be Because it's a class C network. – goblinbox May 9 '11 at 4:29

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