Asus RT-N53 - Manual (Page 40)

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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.