Specifications

Niagara Release 2.3
Revised: May 22, 2002 Niagara Networking & Connectivity Guide
Chapter 5 Connecting to an ISP
Configuring DDNS on the JACE-4/5
5–22
Configuring DDNS on the JACE-4/5
The dynamic domain name service (DDNS) allows a device with a dynamic IP
address to be accessed using a well-known domain name. DNS servers handle
mapping a name (such as JACE54.EasyIP.net) to an IP address. With DDNS, each
time a host receives a new IP address, it sends an update to the name-to-IP-address
mapping on the DDNS server. The DDNS function can be implemented on hosts
connecting to an internal LAN (with company DDNS servers) and the Internet (with
third-party DDNS services).
When configuring a JACE with captive ISP, many times you cannot obtain a static
IP address for the JACE from the ISP. The random IP address makes accessing the
JACE-5 via a browser or GUI tool very difficult. To overcome this limitation a
DDNS client has been implemented on the JACE-4/5. The DDNS implementation on
the JACE-4/5 works with one Internet DDNS provider, the Tzolkin Corporation
(TZO).
About TZO
To implement DDNS, you must purchase an annual DDNS subscription from TZO
for each JACE. TZO provides you a software key, which is the unique identifier that
allows the JACE to register its new IP address on the TZO servers. The JACE must
register in one of two TZO domains (EasyIP.net or MyLinuxPC.com).
Notes • The JACE-4/5 TZO client implementation will not work with the standard
domains listed on the TZO web site (tzo.com, MyModem.com). If you want to
use a TZO domain, you must use either EasyIP.net or MyLinuxPC.com. Be
sure to specify this when you register with TZO.
• The TZO web site does not list the domain EasyIP.net, however you can still
register your JACE in this domain.
TZO also offers several subscription packages with services in addition to DDNS.
The services include domain registration and port forwarding. See the TZO web site
(www.tzo.com
) for more details.
Registering with
TZO
When you register with TZO you must contact them by telephone (not via web site)
and specify:
• that you are an OEM customer
• that your host needs a name in either the EasyIP.net or MyLinuxPC.com
domain
• an e-mail address they can use to contact you
You should receive the following information from TZO (see Table 5-3):
• A software key
• The FQDN of your JACE
• A list of the OEM update servers