Member Avatar for garyemans

I have just bought a Linksys wirelss_G Brodband router, ive connect everything up, all the lcd's are flashing indictating that it works fine but i cannot access the internet. I have tried changing the setting in internet options but nothing seems to work! any suggestions as this is giving me such a headache? :cry: :cry:

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Dani AI

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Short summary and why the restart fixed it

This is a classic cable-modem issue: many cable modems keep the DHCP lease or "remember" the MAC address of the first device they saw. When a new router is attached the modem may refuse to hand out a new WAN address until its memory/lease is cleared. That explains why the modem reset that performed finally restored connectivity. Both (check router/ISP setup) and (restart devices in the right order) pointed to the right areas to investigate.

Practical checks if it happens again

  • Look at the router status page to confirm the WAN address is a routable public IP. If the router shows a self-assigned address, it did not obtain DHCP from the modem.
  • Make sure the router WAN mode matches the ISP requirement (dynamic vs static vs PPPoE).
  • Verify the PC/network adapter isn’t left with a static IP or an ISP utility that bypasses normal DHCP. Installer CDs sometimes change adapter settings — reset the adapter to automatic/DHCP if needed.
  • If the ISP binds service to a MAC address, either use the router’s MAC-clone option or reboot the modem after swapping devices so it will issue a fresh lease.
  • If the modem still will not assign an address, test a single PC directly to the modem to confirm upstream service and, if necessary, contact the ISP to release/register the new device.

Notes and cautions

DMZ is simply a feature that forwards all inbound ports to one internal host; it is not required for basic internet access and should remain off unless you intentionally need to expose a machine. Also consider checking router firmware and the router log if problems recur — those often show why the WAN negotiation failed. Overall, the troubleshooting steps suggested by and were correct, and the modem restart that used is a well-known cure for cable modem/router handoff problems.

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Member Avatar for nizzy1115

What do you ahve the router connected to? Is it connected to your highspeed modem? Did you configure the router to connect to your modem? If not you need to log into the router, (type into your web browser, the default username is blank, and the the password is "admin" which i suggest you change after you get it all set up). On the first screen in the router set up you will see basic setup, you need to enter your information there. You can contact your isp and they will tell you exactly what they want in those fields.

Member Avatar for garyemans

it is connected to a motorola SB5100 SURFboard cable moden (broadbroadband box) A friend setup the configuration for me because a thought a was not doing it properly but still no joy.... :cry: Thanks for your help nizzy!

Member Avatar for cutepinkbunnies

Ok....

What LED's are lit on the surfboard modem?

Is the "internet" LED lit on the router?

May sound a little silly, but have we ensured all the cables are correct and have good connection? Also, have you tried a power cycle on each device (ie. Power down all devices...Power up modem (wait for all lights), power up router, then power up hosts)?

Have you tried resetting the router and starting from scratch again?

Additional note: The config manager for your modem is available by typing in your browser. This may help in diagnosis if there is something wrong beyond the gateway.

Jon

Member Avatar for garyemans

What LED's are lit on the surfboard modem?- Internet, port 1 and the power lcd. the only one which is not on is the DMZ which i am unsure what it is for!


Ive tried all your suggestions before but i have tried again with no success :(
Thanks for your help though!

Gary

Member Avatar for cutepinkbunnies

No worries, we can try to work through this a step at a time.

I'm thinking there might be a problem with the TCP/IP configureation on the client machine since your internet LED is lit (on the router...I don't think the modem has one).

Try this:

Start>Run>"cmd">"ipconfig/all"

Grab a screenshot and post results

Jon

Member Avatar for garyemans

Thanks but I got it to work, by unpluging the modem and restarting it, after that a run the disk. it didnt work the first few times but tried it a third time (I think) and it suddenly work, but cheers for the help!

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