Yes, the IP address is correct. I tried it twice:
1). Through »www.whatismyip.com/
2). Using Dynamic DNS
I did not port forwards or put anything on DMZ.
I went to Settings --> Firewall --> Advanced Configuration --> "Stealth Mode" and verified this was ALREADY checked.
The ports are open, according to NMAP:
Discovered open port 80/tcp
Discovered open port 25/tcp
Discovered open port 110/tcp
Discovered open port 21/tcp
Discovered open port 443/tcp
Discovered open port 8080/tcp
Discovered open port 143/tcp
Discovered open port 3479/tcp
For testing, I unplug EVERYTHING from the 3801HGV and connect only the ASUS router. This ASUS router has been configured to block EVERYTHING. Then I configure the WAN IP address for the ASUS router and test it again as follow:
I. ASUS router uses private IP address from 2WIRE DHCP (192.168.1.xxx)
Run NMAP again (I was connected to the office via VPN, so all traffic are routed through there). The SAME IP addresses above are shown.
II. ASUS router uses public IP address from 2WIRE
From 2WIRE, go to Settings --> LAN --> IP Address allocation and for the ASUS router selected "Public (Select WAN IP mapping). The ASUS WAN port now have the public IP address (99.xxx.xxx.xxx). Run NMAP again, SAME IP addresses are shown.
Any other test I should do to ensure the ports were NOT open on the 2Wire router? I am not a security expert, so other than NMAP port scanning from another network (not while connected to the U-Verse network), I am not sure what other test I can do.
However, if my testing is correct, it seems that the 2WIRE router is opening up all the above ports to the Internet.