Yesterday had Cable Internet hooked up at new house--when done modem had all lights green, and wireless router connected and worked fine. Now router won't connect to Internet, and USB connection direct to modem provides no access. When modem is restarted, "online" flashes green then goes dark. Receive and Send blink. Is Internet service the problem, or modem? Everything worked fine when tech was here yesterday!

Unplug the ISP modem completely, power, and cable. There might be a recycle (a quick push) on the modem as well. Some modems have a battery backup and will stay lit, if not connect the power, reboot and then connect the cable. The modem may take a while to fully reload after reconnecting. Then do the same with the router. Only do a quick push. Holding it in will clear custom settings on the router.

You should have green on both the modem and the router now. If not you have this to inform the ISP of your troubleshooting. GL

You haven't mentioned who is your Internet Service Provider (generally motorola modems are used by cable connections). After connecting the cables properly, you power cycle the modem and the router if this is a cable connection. However, if this is a DSL connection you better contact the ISP and fetch further information. Please contact me again if you need further information.

Sometimes when ISP's do maintenance the DHCP servers re-assign new IP numbers. When you have symptoms like yours it's because the modem, router, and computer are working off previously assigned old IP numbers that may have then been re-assigned to other customers modems after the maintenance. Same with the router. Rebooting your equipment causes them to pull new IP numbers and things start working again.

So, usually a reboot will fix it. Turn off the computer(s). Turn off or unplug the power cables from both the modem and the router. Keep them off for 3 or 4 minutes. Leave the data cables connected. Plug the power to the modem back in FIRST. Give it a few minutes to come up. Any lights should be green. If the lights don't come up green on the modem you'll need to call the cable company.

Second, plug in the router and let it come up. Again, lights should be green. Lastly, turn on the computer.

That should do it. If not, please post back. There are other things to try.

How Can One Cable Modem Work With Two Wireless Routers? By Terry Stockdale Leave a Comment In How to Fry a Wireless Router or Two, I wrote about my brother's experience frying a pair of wireless modems in a lightning storm. Last week, I talked about what had happened, why it happened, and what he could do to prevent the problem in the future (this was the third set of routers, plus he lost a computer motherboard in that storm).
This week, we'll look at his network layout, and why he could not get the network to set up properly.
To summarize the situation, he has an office an a shop, with computers on his network in both locations. Some connect via wired connections (Ethernet), while others use wireless connections. His Internet cable comes into the office first.
In the past, he first used Linksys wireless routers. Then DLinks. This time, he chose Belkin wireless routers.
The incoming cable (standard cable-company RG6 coaxial cable) connects to the cable modem.
Then, the cable modem connects to the WAN (wide area network "Internet") connection on the router.
The local wired ports on the router provide connections for two wired computers. Notebooks connect via wireless connections. Finally, one wired connection on the router is used to connect an Ethernet cable that runs 250 feed to the office from the shop.
That cable was the lightning problem, as it runs outside in a conduit just a little bit underground. Effectively, he's got a 250 foot antenna looking for the electromagnetic pulse from a lightning strike. Most of us don't worry about that because our equipment is so well grounded in the house, plus the Ethernet cables we use are much shorter lines. Even if we have underground cable company lines running from their switch boxes to our houses, those lines are usually only exposed about 40 to 50 feet before they enter the dwellings.
Back to the situation. When he hooked up his replacement routers, the router at the shop immediately worked. Not so, on the router in the office. The Ethernet light and the Activity light just poounded away, blinking and blinking rapidly. But, nothing connecting to the router could get to the Internet.
If they connected a computer directly to the Ethernet cable in the office, without running it into the router first, it worked just fine. But, with the router in place, it didn't work.
The problem was the way he connected the two routers. The problem is that there is no Out Of The Box connection that will work reliably. At least one thing, usually two, has/have to be tweaked one way or another.
As one might guess, the easiest way to connect would be to connect one router's WAN connector to the cable modem, using Ethernet cable, and then use Ethernet cable to connect one of the Local Area Network (LAN) connectors on that router ot the WAN router on the other computer.
There is a problem with this setup, but it's easily solved. First, if you're using identical wireless routers, as he was, the wireless routers are both trying to use the same IP Address range and subnet mask for their local area networks.
That works fine for the first router, which is connected to cable modem. On the cable modem side, it gets an IP address on the Internet Service Provider's network - often an actual Internet address and not just a private network address. On the local area network, it assigns the IP address range specified in its setup menu. This often varies by manufacturer. In the case of Linksys, this is 192.168.1.x. In the case of the Belkin routers he bought, it was 192.168.2.x.
The problem occurs at the second router. On it's WAN side, it sees a 192.168.2.x network - but it's default setting tells it to give 192.168.2.x addresses on it's local area network side, too. In other words - it's confused. It doesn't know where to find the Internet because both networks are assigned the same addresses.
The solution was to disconnect the second router's WAN/Internet cable, connect to it via a wired computer, and tell the second router to use a different IP address range. We chose 192.168.3.x.
We hooked up the Ethernet cable to the Internet/WAN side of the router again. The router started working fine, normal light blinks for activity, no more confusion. The computers could get to the Internet just fine.
Problem solved.
That solved the Internet connection problem. However, no computers in the office would be able to share files or printers with the shop, nor would computers in the shop be able to share with the office. That was both acceptable and intended, in this case.
It could be done; however, that would require a different configuration on the routers and connections.

an rj45 cable - have you tried using the old cable with the new device?

Check if you can connect to the internet when hooked directly to the modem. If your connection works fine through the modem, then your router needs to be reconfigured.

cannot connect the wifi router

Sounds like a faulty router or issue with the firmware if it is unaccesible, your best solution is to factory reset the device and try again.

Regards,

Kris

You can still use your existing Linksys router with your cable modem. In fact the router your have is designed to work with DSL/Cable Broadband connections.

1. Make sure to properly connec the devices in your network. Modem will be connected to the Internet port of the router. Then, laptop will be connected to one of the 4 Ethernet ports of the router. For initial setup of your router with modem, you need to hardwire laptop to the router.
2. Press and hold reset at the back of the router for about 15 seconds.
3. After 15 seconds turn off the router and then turn off the modem. Wait for a minute.
4. Power on modem and wait for the lights to be ready.
5. When modem lights are on, turn on router.
6. There should be 4 lights on. Power should be steady green. Internet, WLAN and Ethernet port.
7. Checked if you have Internet connectivity on your laptop while it is wired to the router.
8. If Internet is working, disconnect laptop from wired connection to the router and check available wireless network that laptop can detect.
9. The default wireless network name that the Linksys router broadcasts is "linksys". Connect to it which is an unsecured wireless network.
10. Once you are successfully connected, check Internet.

Hope this helps!

Check for a vaild gateway address on router,start.run.cmd> type in ipconfig.if you dont have a valid ip or gatway. try a powercycle,turn off modem and then router,wait about 10-20 sec and plug modem back in. check your ip and gateway check for a connection, if that dont work call netgear to see if u have a defaulted router, or take it back for new one if u still have a recicpt.