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ZyXEL – SBG Support Notes
BOOTP/DHCP to request an IP address.
What is DDNS?
The Dynamic DNS service allows you to alias a dynamic IP address to a
static hostname, allowing your computer to be more easily accessed from
various locations on the Internet. To use the service, you must first apply
for an account from one of several free Web servers such as
WWW.DYNDNS.ORG.
Without DDNS, our users will always need to use the WAN IP address of the
SBG Series to reach our internal server. It is inconvenient for the users if
this IP is dynamic. With DDNS supported by the device, you can apply for
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 address of the SBG
Series.
When the ISP assigns the device (SBG Series) a new IP address, the device
updates this IP address to the DDNS server so that of the server to 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)
remains usable.
When do I need to use DDNS service?
When you want your internal server to be accessed by using DNS name
rather than using the dynamic IP address we can use the DDNS service.
The DDNS server allows to alias a dynamic IP address to a static hostname.
Whenever the ISP assigns you a new IP address, the device sends this IP
address to the DDNS server to update its records.
Introduction of QoS
Quality of Service (QoS) refers to both a network's ability to deliver data
with minimum delay, and to the networking methods used to control the
use of bandwidth. QoS allows the ZyXEL device to group and prioritize
application traffic and fine-tune network performance.
Without QoS, all traffic data is equally likely to be dropped when the
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