it will continuously blink . this shows the siganl is transmitting from the access point. and this frequency of this light blinking will increase when some client computers are connected to your access point or router
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Note that incoming traffic will cause the WAN (or Internet) light to blink even if it is 'probe' traffic trying to break in to your network. Such traffic is to be expected and is the reason you have firewall functionality in your gateway router.
On the inside, there is a bit of traffic on any LAN when the computers are turned on. Messages generated by the router itself are used to find computers and printers for a lot of different legitimate reasons.
Also check if the power light on your router is blinking. If it is blinking, that's an indication of hardware failure. To revive it, do a hard reset. Press and hold the power button of the router for 30 seconds then unplug the power. Wait for 30 seconds again before you plug it back in.