Unable to connect second PC

October 20, 2008 at 03:59:01
Specs: XP Pro SP2, 2.8GHz/512MB
Hi all,

I am trying to set up a very basic network. I have a Optusnet Cable modem which is connected to a 4-port switch using CAT6 cable. At present, two PCs are connected to the switch through CAT6 cable. The first PC has internet connection.

However the second PC is unable to connect to the cable modem. I am prompted with a message, "Limited or no connection" over the network icon in the toolbar.

I have used the ipconfig function through cmd. The first PC has the default gateway address, but the second PC default gateway address is blank. Also with the second PC, has a different subnet IP address assigned to it (not sure if i am using the correct terminology - please excuse).

Any assistance will be greatly appreciated....


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October 20, 2008 at 05:50:00
The gateway address and subnet mask should be the same for both pc's.

On the first pc if you haven't set-up a static ip address the network adapter will likely be set to automatically obtain the settings. You will need to do the same for the second pc.

On the First pc right click on the network icon in the taskbar and click on "Open Network Connections".

In this new screen right click on the network adaptor icon and select "Properties".

Now go down to "Internet Protocol (TCP/IP)" and highlight it then select "Properties". In the screen that pops up, see if the settings are: "Obtain IP address automatically" and "Obtain DNS server address automatically"

If they are, make the second pc exactly the same and it should be able to connect to the internet.

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October 20, 2008 at 07:35:52
So, you're going straight from the modem to your switch then to your PC's. Why aren't you using a broadband router?

How many public IP addresses is your ISP providing you? I'm willing to bet that they are only providing you with a single IP address. If you want more than 1 computer to access the Internet, then you'll want to buy a router.

modem -> router -> switch -> computers

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October 20, 2008 at 08:07:40
Replace that switch with a router, then should solve your problem. You cannot get 2 computers online without a router. Take a look on this Ethernet home network setup tutorial to help you more.

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Related Solutions

October 20, 2008 at 08:45:07
You cannot get 2 computers online without a router.

That's not entirely true. You can get online with as many computers as the number of IP addresses your ISP provides. Most ISP's usually only provide a single IP to residential customers, but if you're willing to pay the additional rate, they will provide more addresses. My brother is paying an extra $25 to get 6 public IP addresses.

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October 20, 2008 at 17:43:17
XP pro should be able to provide Internet sharing as well. While a router is a better solution, if you don't want to buy one right now, you could find a cheap 2nd Ethernet for the 1st computer (like maybe a USB-2-Ethernet) and use it to share the Internet with the 2nd computer.

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October 20, 2008 at 18:49:20

Settings on both PCs are the same, both on auto detect.

To everyone else,

At my old place, I had four computers online through cable modem -> hub -> computers.

I never had this problem at my old place. I have moved into a new place and since then this problem has surfaced.

Optus gave me a new modem when the techs were installing the cable service at this place. I have to tried to connect to the cable modem using the default gateway address, I obtained through ipconfig. I loaded the address on the browser on the PC that is online. But the browser was unable to connect to the modem???

Any ideas how to check the DHCP server configuration on the cable modem? Assuming that the cable modem does have a DHCP modem.


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October 20, 2008 at 19:28:53

For the second pc have you tried configuring it yourself with a static IP?

Manually configure the adapter to use the same gateway address, subnet mask and DNS servers.

For the IP address setting use an address thats falls into the same subnet. For example if your gateway address is I would set it so that my static IP address was say or the last octet can go up to 254. You only need to change the last octet (in bold). Leave the first three octets the same as the gateway.

See if you can get internet connectivity then. If you still can't get on the internet try pinging your cable modem (gateway address) and let us know if you get responses.

[EDIT] If this fails also try bypassing the switch with the second pc and connect it directly to the modem... If you get connectivity then, the problem is at the switch.

If you don't get connectivity try pinging the network adapter ( if you don't get any replies the problem there.[/EDIT]

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October 20, 2008 at 20:13:02
Run this command on the computer that has Internet access and post back with its results.

C:\>ipconfig /all

What is the brand and model of your modem?

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October 21, 2008 at 14:06:29
There are two possible ways to do that... 1) Make the same name of Workgoup on all the PC and also in TCP/IP settings Select "Use automatic settings for IP address" 2) Make the same gateway on all the computer and define manual Is in TCP/IP settings.... The default gateway should be the same on all computer however the IP address on each computer should have different values in last octate... Like, Definitely it will work....

After doing this check your internet connection settings and select.. "Allow other computers to share this connection." from Network Connection wondow.

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