Solved Modem only connects one comp to the net

August 6, 2011 at 22:46:21
Specs: Windows XP
I'm setting up a network for the first time. I have-
Modem: Motorola cable SB5101
Switch: D-link des 1008d
Computers - both are running XP service pack 3.

This is my setup at the moment:

I can only get one comp at a time to connect to the net, but both work - just not at the same time. The other comp has 'limited connectivity' and when I repair the connection, it tells me the IP address cannot be renewed.

Sure enough, when I do ipconfig /all, it has not assigned me a default gateway or a DNS server. So I went in and manually assigned those. I used the same details as the comp that is connected to the net, but changed the IP address by one number so they are not the same. Doing that meant the connection was fixed between the two computers, however that second computer still cannot connect to the net.

I had a look in the modem configuration and made sure that DHCP server was enabled. But it still doesn't want to assign the second comp so I'm stuck here. And also, I thought this modem also functioned like a router, but I'm not sure now...

Thanks for your help!

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August 7, 2011 at 00:03:33
✔ Best Answer
You need a router, rather than a switch, to share the modem connection.

"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd

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August 7, 2011 at 05:42:03
Thanks John, I thought the modem would also work as a router so there was no need for one. I have got a TP-link TD-8810 ADSL modem router, which I just tried to use instead of the switch. But apparently you need a WAN port and that's the phone line, so it's no good for trying to connect a cable modem?

And the same thing happens as the switch when connecting it through a lan port, internet works on one comp at a time only.I cannot even get into the router's IP address page.

Looks like I need to switch the switch for a router? What does it need to have to work?

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