Trouble Connecting Xbox to Internet using Comtrend Modem

I have a Comtrend AR-5200u modem and I was having trouble connecting to the internet. On the IPv6 LAN Application page, do the following: 1) Enable DHCPv6 Server 2) Stateless with Refresh Time of 600 sec 3) Enable RADVD 4) RA interval min of 3 sec 5) RA interval max...