Asus RT-N66R - Manual (Page 53)

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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. The internet is working well.
2. The DNS server is working well.
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 to separately access my
http and ftp servers?
No, you cannot. You can only register one domain name for one
router. Use port mapping to implement security in the network.
5. After restarting the router, why is it that I see different WAN
IPs 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 time for IP updating.
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.