My belkin 54g wifi router is making a new DHCP request to my isp every 4 minute or so - the lease time is set to "1200"

have you got two dhcp servers running ?
turn off dhcp server in wireless router
and use the one in the Thomson TWG850-4 Residential Voice Gateway.
make sure ip address in wireless router is different to the Thomson TWG850-4 Residential Voice Gateway. make it one higher on last digit of ip address
make sure dhcp does not lease out this ip address.

DHCP SERVER in Router and DHCP server in Wireless Conflicting - Set WI Fi DHCP router leases to say 192.168.0.10 to 192.168.0.100 and default gateway as 192.168.0.1 and on the router set the router's ip address to 192.168.0.1 make the Wi Fi router address 192,168.0.2 . Set in the router the DHCP address leases to 192.168.0.101 - 192.168.0.254 and default gateway 192.168.0.1 or deactivate one of the dhcp servers and rely on one dhcp server like the routers and then deactivate the wi fi's dhcp server.

While facing the problem, check the lights. Is it changing or not?

If it changes, The problem maybe with the router. Contact Belkin: 18002235546

If it is not changing, You need to contact the ISP.

You need to attach the Belkin 54g wireless router to the DSL/cable modem. Then have all the computers connect wirelessly to the belkin. They should then be able to get out.

Are all computers connected to the router affected?
If so, try this first:

1. Unplug the power to the cable / DSL modem
2. Connect the power to the router.
3. Connect a computer to one of the LAN ports of the router.
4. Restart your computer.
5. Restore the router to factory defaults. Note: This will remove all previously configured settings.
6. Once the router has gone through the restore it will then begin the reboot. When the reboot completes plug the power back into your modem.
   

This addresses a common scenario where the router has been connected to the Internet for an extended period and holds an IP address (DHCP lease) for a longer period of time than your Internet Service Provider (ISP) allows.

This is normal and does not indicate any issue with your Belkin router or ISP.

If the router is located where you cannot easily unplug it, you can restart it using the router's web-based interface. If your DHCP lease time seems to be extremely short, contact your ISP to see if there are other issues on the network.

In certain network scenarios, it may be helpful to turn off all the equipment on your network, and then turn it all back on. Leaving some devices unplugged for up to five minutes can also help. Try unplugging the router, any switches, and any cable or DSL modems. Shut down connected computers. Plug in the cable or DSL modem first.

Plug in the Belkin router second, and wait for the lights to cycle through the startup routine. This prevents another device from taking the DHCP lease. Lastly, start up your computer.

Try opening the Network Control Panel on the MacBook. Select the TCP/IP tab, then click Advanced. Note the list of IP address numbers. Click the "Renew DHCP Lease" button and see what changed. Most likely all of them did, in particular the "Internet Gateway" and "DNS server" addresses. The first is the connection between the D-Link router and your ISP, and the other addresses are for servers that translate your web browser URLs into the IP addresses for the web sites you want to see. The Gateway and DNS server addresses have to match those in the upstream router(s). The routers must have current IP addresses assigned by the routers upstream, and any client computer must have a current address assigned by the first route upstream. You can check into this by logging in to the webpages for your routers and examining the status reports.

Apparently one of the devices in the chain fails to obtain a new IP address when the D-Link router is powered on. I suspect it is the Belkin router. A computer with an expired DHCP lease will probably be using the Internet gateway IP address assigned to the D-Link router when it was on before (in a busy neighborhood, that address would have been re-assigned to some other household). The Windows system may be sending a request for DHCP renewal up the line, which triggers the Belkin router to ask for the same from the D-Link unit, but it may be ignoring the signal from the MacBook or not getting one.

If the MacBook successfully gets online with a manual Renew DHCP Lease request, obtain the owner's manual for your Belkin router (find the model number, then go to the Belkin support/downloads page for that model). See what settings are available to automate the DHCP renewal process.

Are you sure your modem is giving a WAN IP from your ISP? Try power-cycling your modem with your router unplugged then bring up your router next, if you havent tried that already... After that try connecting your modem directly to a PC and set your NIC card to DHCP and see if you get an IP address thats routable to the internet (i.e not a private IP)

Is your xbox connected wirelessly to your router?

It is quite possible that your issue is due to the DHCP function of your router. I would check the DHCP settings and the lease time that is set. Its quite possible that the lease time is running out and its having difficulty renewing a new IP.

Hi,

Your Belkin router is normally configured to get a dynamic IP Add from your Internet provider unless otherwise configured. Most ISP's network where clients/subscribers connect (through DSL) has a DHCP server that hands out this IP adds. If your router keeps on changing its WAN IP add, it may presumably be because:
1. Your router keeps on rebooting or powering on/off and everytime it turns on, it is given a new IP add;
2. Your ISP's DHCP server keeps on renewing its lease on the IP add given to your router.

Corrective measures would entail:
a. Do a full hard reset of your router and go through the installation setup again. Of course this would revert all settings/configuration to factory default; and/or
b. Contact your ISP and explain your concern.

In some cases, the router's MAC address has an issue that the ISP's DHCP is keeping a hard time recognizing it. this can be corrected with a firmware update.

Hope this be of help/idea. Pls post back how things tunrs up or should you need additional information.

Good luck and kin regards.