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9.8 DDNS
Click on the
DDNS
link to configure and add dynamic DNS
entries. Dynamic DNS (DDNS) is a service that facilitates
outside Internet access to a LAN host even when the host's
dynamically-assigned IP address changes frequently.
DDNS is useful when you have a host (running for example, a
web server) that receives a dynamically assigned IP address
from a DHCP server. A user on the Internet would typically
access the host by entering its name in their web browser. A
DNS server on the web would then resolve the name to its
associated numeric IP address, as required for Internet protocol
processing. However, when a host's IP address is dynamically
assigned (for example, by a DHCP server), it may change
frequently. In this scenario, a DNS server may have outdated
data and may not be able to resolve a host name to the current
IP address.
When a host is registered with a DDNS service provider, the
provider is automatically notified by the host of any change in
its IP address and the provider then propagates the change
throughout the DNS server system.
Click on the
Add
Service
button to a new DDNS entry.
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Interface:
Select an interface from the drop-down list.
Specifies the public device interface. You can specify only
one DDNS service on each interface.
Service Name:
Select the DDNS service provider from the
drop-down list for which the host names of the interface
have been registered.
DYDNS
(Dynamic Network
Servicves, Inc.) or
TZO
(Tzolkin Corporation).
Username/Password:
Enter the username and password
for the DDNS service.
Type of System
: Select a type of system from the
drop-down list:
Dynamic DNS
,
Static DNS
, or
Custom
DNS
.
Dynamic DNS
associates your hostname with the
ISP-assigned dynamic IP address, updates the IP address
when notified of changes, and propagates the update
throughout the DNS server system.
Static DNS
associates
your hostname with your ISP-assigned static IP address.
Although automatic updates are allowed, changes to the IP
address are expected to be less frequent, and will take
longer to propagate though the DNS system.
Custom DNS
