Internet Connection Sharing

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Networking
Tech support
Hey all, Got a little problem with Internet Connection Sharing on Windows XP that I hope someone can help me with. I have a laptop with a built in wireless networking card (802.11b) that connects to a wireless router. The router also has two other computers attached to it (one wireless, one CAT5), and a cable modem, providing all three computers with 2Mb internet access. I also have a desktop computer connected to my laptop via a cross-over ethernet cable. I wish to be able to share the internet connection I get with my wireless laptop with the desktop computer, but every time I try to share it I get an error saying "Internet Connection Sharing cannot be enabled. A LAN connection is already configured with the IP address that is required for automatic IP addressing.", despite the fact that the ethernet card on my laptop is set to 192.168.0.1, as directed. The router is currently 192.168.0.2. Both the laptop and the desktop are running Windows XP. Thanks very much, Godspeed

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Internet Connection sharing can only be enabled on a modem (Dialup, cable,DSL) not on a LAN connection. Windows figures if you have a LAN connection to internet you don’t need sharing, just connect other system to LAN. Options are to get yourself a cheap HUB, and make connection that way. Or (And I don’t know if this will work on XP), Enable routing service on XP box, and specify Ethernet IP of your XP box as gateway for the other system. You may have to add some additional routing information on the XP System.

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  • Jlytle
    hello, I don;t know what the first poster is talking about, Internet Connection Sharing (ICS) is definitely meant for Lan use, not just modem use. ok with that said, your problem is one of 2 things: - possible problem #1: you either have the IP address hardcoded to the IP address ICS would assign it. If you want your laptop to be the ICS machine and your desktop to connect through it, then you should set the desktop to obtain an IP address automatically and let ICS on the laptop assign the desktop an IP. Now, this will only work if "possible problem #2" (see below)is not the case... - possible problem #2: You need to check this, but your wireless router most likely has DHCP enabled and is assigning addresses from the 192.168.0.x network. Unfortunately, this is the same network that ICS uses to perform it's work. So, you need to go into the wireless router's config and change the network that it will live on to 192.168.1.x so that you will now have 2 separate networks. When you turn on ICS on the laptop, the laptop will have 2 network cards, each on their own network and ICS will bridge them allowing the desktop to connect through. Once you have this setup, open a command prompt on the laptop and type 'ipconfig /all' and you should see 2 network adapters listed where one of them has a 192.168.0.x address (ICS) and the other has a 192.168.1.x address (wireless router and internet). The desktop should be able to ping the address of laptop's ICS network address as a troubleshooting step if it can't connect to the internet. give it a try and post back here any troubles. list as much info as you can and I can help. good luck! you are close and this is totally possible. possibly the address that. Set the computer you want to connect to the internet to 'automatically obtain an IP address' then set up the ICS on the server (I mean server as in the machine you want to share the internet through).
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  • Kholder
    Get yourself a USB wireless device for the desktop for about $30. That way the laptop doesn't need to turned on for the desktop to work. Much easier to support too. http://www1.linksys.com/products/group.asp?grid=33&scid=36
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  • MennoT
    Internet Connection Sharing may be handy for those whithout understanding who want to configure network access for other computers in the home, but for those with understanding it is a pain, because you cannot configure it as you want. Indeed you can only enable ICS if 192.168.0.0 is not used otherwise. DHCP is automatically configured, whether you need it or not, and with that range; there doesn't seem to be a way to change that range in XP. That implies, that you have to use another IP range on the wireless network - at least temporarily, for the duration of the configuration. Most (but not all) wireless routers will enable you to do that. Once you have changed the IP address range on the wireless LAN, ICS will work. If you like, you can now switch off DHCP for the ethernet interface: the ICS function (NAT) will keep functioning if you change the interface settings afterwards. Just go to the interface and assign whatever fixed address and subnet mask you like.
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