3.I have registered a domain name before and it has been working well until my friends told me that they could not access my domain name.

Check the following:

1.Internet connection is available.

2.The DNS server is working properly.

3.The last time you updated the domain name.

If there are still problems in accessing your domain name, contact the service center.

4.Can I register two domain names so I can access my HTTP and FTP servers separately?

No, you cannot.You can only register one domain name for one router.You can use port mapping to implement security in the network.

5.After restarting the router, why is it that I see a different WAN IP address in MS-DOS and in the router configuration page?

This is normal.The interval time between the ISP DNS server and ASUS DDNS results in different WAN IPs in MS-DOS and in the router configuration page. Different ISPs may have different interval times for updating IP addresses.

6.Is the ASUS DDNS service free, or is it just a trial version?

The ASUS DDNS service is a free and embedded service in some ASUS routers. Check your ASUS router if it supports the ASUS DDNS service.

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Asus RTN12D1, RT-N12/D1 manual