Using The Dynamic Dns (Ddns) - ZyXEL Communications P-660HN-T1A Support Notes

P-660HN Series Support Notes
One rule configured for using Many-to-Many No Overload mapping type is
shown below.
We can also do this by configure threeOne-to-One mapping type rules.

6. Using the Dynamic DNS (DDNS)


What is DDNS?
The DDNS service, an IP Registry provides a public central database where
information such as email addresses, hostnames, IPs etc. can be stored and
retrieved. This solves the problems if your DNS server uses an IP associated
with dynamic IPs.
Without DDNS, we always tell the users to use the WAN IP of the
P-660HN-T1A to access the internal server. It is inconvenient for the users if
this IP is dynamic. With DDNS supported by the P-660HN-T1A, you apply a
DNS name (e.g., www.zyxel.com.tw) for your server (e.g., Web server) from a
DDNS server. The outside users can always access the web server using the
www.zyxel.com.tw regardless of the WAN IP of the P-660HN-T1A.
When the ISP assigns the P-660HN-T1A a new IP, the P-660HN-T1A must
inform the DDNS server the change of this IP so that the server can update its
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