This one is tricky, I did it with my dgl-4500 and dir-655. What I did was first connect the first router port 1 to the second router port 1 not wan port, then setup the dhcp, DHCP Reservation, MAC filters, and internet. To get them connected correctly set the first router's IP such as 192.168.x.1 and start 192.168.x.2 to 192.168.x.250, set the DHCP Reservation up for the second router 192.168.x.2, put in the second routers MAC address into the first router mac filter, and setup the internet as normal. On the second router turn off the, DHCP Reservation, MAC filter, internet and setup the DHCP IP address for the second router as 192.168.x.2. For the wireless, you must have the security setup on both of them. You may need to connect a computer to the second router to set it up and turn on DNS relay in network settings.