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Router will not connect through cable modem with static ip

Posted on 2010-11-08
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Last Modified: 2012-05-10
I have a linksys etherfast 4 port router, and my isp has set me up with a static ip address. I set the router to static ip and input the ip address, but it will not connect to the internet. Nothing that plugs into the router has internet access.

When I input the same static ip address into the ipv4 of my computer it connects to the internet via the modem just fine. What else do I have to configure on my router/modem so that the router will work?
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Question by:charlesAMAG
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by:wilmaflintstone
ID: 34086998
normally, your modem gets that ip number, and your pc gets an ip number from the modem.

Your router does not get an ip address, but is assigned an ip address by you.

So the steps you have to take:
1) plugin your computer (into the modem) and turn it on
2) when everything works, open a cmd (dosbox) and type ipconfig
3) you will see an ip address and a subnet mask
4) if you have an ip address within 192.168.0.0 and 192.168.255.255, than you have an ip adress assigned to you by the modem.
5) make your router something like 192.168.123.2 (if your ip address is 192.168.123.100, if your ip address is 192.168.1.10 choose 192.168.1.2 for your router.)
6) plugin your router into the modem
7) connect your pc to the router
8) finished

(i made the assumption your router is actually a switch. If it actually is a router, let me now why you want to use this)
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getzjd earned 125 total points
ID: 34087011
Was the linksys router previously in use?  Are there old settings in it?  Have you tried a factory reset?    Is your gateway and subnet correct on the static wan intrerface?   If your computer connects to the internet with the static IP assigned, then assign the same settings to the Linksys and make sure you cycle the power on the internet modem when switching devices.  sometimes ISPs limit 1 mac address which is reset when you reboot the modem.
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Author Comment

by:charlesAMAG
ID: 34087165
It is actually a router, and when the computer us directly connected to the modem it will not connect to the Internet unless I have given it the static ip, subnet and gateway information from the ISP.

The modem is set to use a static ip because we use rdp to connect to the machines plugged into the router. The subnet information is correct and all the numbers have been verified. I tried connecting via the computer and then switching to the router with the same configuration and cycling the modem but that fails.

There were old settings in the router but I did a factory reset and it is now clear.
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by:wilmaflintstone
ID: 34091963
If your computer gets the ip address assigned to your connection, than the modem is in bridging mode (or perhaps some other).

This setup is more complex to handle.

What is it you are trying to accomplish?


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Expert Comment

by:dosdet2
ID: 34094451
I'd like to verify your setup.  This is what I got from your posts:
IPS -> Modem -> Router -> workstations

When the workstation is plugged into the Modem & configured with the ISP's IP, Mask & DNS - it works.  but when the router is inserted in between.   I assume you have not made IP changes within the modem.
If this is not right, you can ignore the rest of this post.

Make sure you have done a factory reset by holding the reset button for at least 30 seconds,
Within the router web interface:
Put the ISP's static IP information in the WAN settings of the Router.  The correct mask is critical.

Check the Lan Side - these settings should be factory - but just in case...
Set the LAN side to be a DHCP server.  
Assign the LAN interface with an IP something like 192.168.1.1, Mask 255.255.255.0

Reboot the workstation and try the internet.  If is does not work, please run an IPconfig /all from a command prompt and post the results here.
Let us know

You will need to open up some ports for RDP to work, but one step at a time.

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by:dosdet2
ID: 34094488
One more thing, if you can't get to the internet, go to a command prompt and try pinging 205.171.3.65.
This is a dns server for qwest.  Let us know if this is successful .
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Author Closing Comment

by:charlesAMAG
ID: 34094522
What it actually was was the mac address issue, though I solved it by cloning the mac address on the router.
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