Question from Reader:
I need help connecting to the internet. I can get connected if I plug Ethernet cord straight into the computer, but if I plug Ethernet cord into router my computer can see router, but can't connect to internet. My service provider can't get to me until Jan.11th. I will lose it before then. Can you please help me?
asked Jan 03 '13 at 15:16
It sounds like the there is some kind of compatibility issue between the router and the modem.
Most common, is the router is not automatically receiving an IP form the modem's built-in DHCP server. If you can login to the modem directly (connect your computer to the modem directly and visit its IP) by visiting it's local IP (probably 192.168.1.1) then you might be able to manually assign an IP address to the router in its software. Once done there, the same thing would need to be done to the router.
Another issue, although less common, is that the ISP could be taking issue with the MAC address of your router. I had this problem once and had to use MAC address cloning to duplicate the modem's MAC address onto the router in order for the connection to go through, and then I just forwarded the modem's connection to it.
In either case it may be beneficial to contact your ISP.
Here's how your setup "should" work.
The Cable Modem is what brings in Internet Service into the house. If you plug into that Cable Modem, boom -- you have internet.
Now, plugin the Wireless Switch. The Wireless switch does nothing more than extend the signal from the Cable Modem to both the Wireless network and the physical switch (if you plug directly into the wireless switch with a network cable). Obviously you want to connect to the wireless signal so that's obvious.
What should be happening then is when you connect to the wireless switch (via WIFI / Wireless) it should pass your connection to the Cable Modem which will then give you an IP address and other important information like DNS and a Gateway etc...
What could be a problem your having is
1 - Wireless Switch is broken 2 - Wireless Switch is misconfigured
Now being that it was working and now it isn't.... that tells me you have a hardware issue, not a configuration issue so you need to get a tech onsite to swap out some hardware.
However, if you want to troubleshoot. If it was me, I would login to your wireless switch and make sure you disable DHCP. This will prevent you from getting an IP address from the Wireless Switch vs. the Cable Modem. Now, reboot everything including your computer and try again. You should get an IP address now from the Cable Modem and be golden.
Hope that helps...
answered Jan 04 '13 at 12:57
Sounds like a hardware issue.
Go into command line and do an IP config and see where you're getting an IP from. The Wireless Switch or the Cable Modem. From there you will know if the issue is with the Wireless unit or the modem itself.
Sounds like an issue between the Cable Modem and the Wireless Switch.
answered Jan 04 '13 at 13:24