How to access Advance Settings and DMZ in ZXDSL 831ii modem?

1. Type 192.168.1.1 in the address bar
2. When prompt with username and password. Use 'admin' and 'bayandsl', respectively without the qoute. 
3. Go to Advance, in the left pane click NAT.
4. Click DMZ, choose Enable.
5. Enter the IP Address of the device you want to access in the internet.
6. Click Save.

To make sure your entries has been saved, Reboot the modem and access it again.