ASUS RT-N12 Manuel D’Utilisation

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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.  Internet connection is available.
.  The DNS server is working properly.
.  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.