I gave solution with telnet or SSH in my post higher.

and the best solution was install the dd-wrt firmware It's your choice ;)

Tito tried the putty? arp add example: arp add 192.168.1.100 a3:34:72:bb:04 arp show - you can see mac add to arp list in router.

Thanks a lot.

Do you have an active and installed network cards in your computer with WIN7?

have this message in router setting WAN port is unplugged,, check photo here Configuration without WAN is also possible in this device. TP-link is working like access point only with 4 ports switch.