Dynamic Dns; Dyndns Wildcard; High Availability - ZyXEL Communications Vantage CNM User Manual

Table 98 Configuration > DNS > Cache
LABEL
Cache Negative
DNS Resolutions
Negative Cache
Period
Apply
Reset

17.9 Dynamic DNS

Dynamic DNS allows you to update your current dynamic IP address with one or many
dynamic DNS services so that anyone can contact you (in NetMeeting, CU-SeeMe, etc.). You
can also access your FTP server or Web site on your own computer using a domain name (for
instance myhost.dhs.org, where myhost is a name of your choice) that will never change
instead of using an IP address that changes each time you reconnect. Your friends or relatives
will always be able to call you even if they don't know your IP address.
First of all, you need to have registered a dynamic DNS account with www.dyndns.org. This is
for people with a dynamic IP from their ISP or DHCP server that would still like to have a
domain name. The Dynamic DNS service provider will give you a password or key.
Note: You must go to the Dynamic DNS service provider's website and register a
user account and a domain name before you can use the Dynamic DNS
service with your ZyWALL.

17.9.1 DYNDNS Wildcard

Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the
same IP address as yourhost.dyndns.org. This feature is useful if you want to be able to use,
for example, www.yourhost.dyndns.org and still reach your hostname.
Note: If you have a private WAN IP address, then you cannot use Dynamic DNS.

17.9.2 High Availability

A DNS server maps a domain name to a port's IP address. If that WAN port loses its
connection, high availability allows the router to substitute another port's IP address for the
domain name mapping.
Chapter 17 Configuration > DNS
DESCRIPTION
Caching negative DNS resolutions helps speed up the ZyWALL's processing of
commonly queried domain names (for which DNS resolution has failed) and
reduces the amount of traffic that the ZyWALL sends out to the WAN.
Type the time (60 to 3600 seconds) that the ZyWALL is to allow a negative
resolution entry to remain in the DNS cache before discarding it.
Click Apply to save your changes back to the ZyWALL.
Click Reset to begin configuring this screen afresh.
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