Belkin wired voip iad not connecting to internet with macbook

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.