Using the dynamic dns (ddns) – ZyXEL Communications P-2302R-P1 User Manual
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P2302R-P1 Support Notes
All contents Copyright
2007 ZyXEL Communications Corporation.
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Using the Dynamic DNS (DDNS)
1. 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 ZyXEL Device to access the internal server.
It is inconvenient for the users if this IP is dynamic. With DDNS supported by the ZyXEL Device, 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 ZyXEL
Device.
When the ISP assigns the ZyXEL Device a new IP, the ZyXEL Device must inform the DDNS server the
change of this IP so that the server can update its IP-to-DNS entry. Once the IP-to-DNS table in the DDNS
server is updated, the DNS name for your web server (i.e., www.zyxel.com.tw) is still usable.
The DDNS server stores password-protected email addresses with IPs and hostnames and accepts queries based
on email addresses. So, there must be an email entry in the ZyXEL Device menu 1.
The DDNS servers the ZyXEL Device supports currently is
where you apply the DNS
from and update the WAN IP to.
Setup the DDNS
Before configuring the DDNS settings in the ZyXEL Device, you must register an account from
the DDNS server such as
first. After the registration, you have a hostname
for your internal server and a password using to update the IP to the DDNS server.
Visit 'Dynamic DNS' in the 'Maintenance>System' in the WEB GUI to configure the settings.