I have a WDR3600 and the IPv6 does not work for Comcast Cable ISP in the US. I have been helping TP-Link engineers find an answer by sending them Wireshark captures when I directly connect to my...

Log into the router. Under Network-WAN, make sure WAN Connection Type is set to Dynamic IP. That's what I use for Comcast and a WDR3600. Then power off the router and modem and re-power both.

Can you access the Internet if you connect your computer directly to the modem, thereby bypassing the router? If you can then try cloning the computer's MAC address into the router.

If you want to access your USB storage from outside your own home wireless network, you'll need to run the FTP server and then you can login to that server from anywhere. Usually the IP you connect...