NB600W Super-G Wireless Broadband Gateway User Guide YML775 Rev1
60 www.netcomm.com.au
Appendix B: Frequent Asked Questions
Q: What is a “dynamic IP address”?
A: An IP address from your ISP which is assigned via DHCP and is therefore not guaranteed
to remain the same. Some cable modem Internet providers provide IP address assignments
which rarely change, but the addresses assigned are still considered to be dynamic, not static.
Q: When should I modify the MAC address for global port settings?
A: Some ISPs identify their clients by their MAC address and host names. Entering this in-
formation allows authentication. The MAC address required for the global port settings is the
adapter address for the device you are now configuring. Most ISPs use automatic registration
and do not limit network MAC addresses. But, if they do, you can change your MAC address
to meet their registration.
Q: What is DMZ?
A: DMZ (demilitarized zone) is a barrier between the Internet and a company’s Intranet. It is
a subnet that contains a firewall and proxy server, which can be in separate servers or in one
server. The firewall connects to an external firewall on the Internet side, which may be at the
ISP’s location and is often called a “boundary router”. The double firewall architecture adds an
extra measure of security for the Intranet.
Q: What is Dynamic DNS?
A: The Dynamic DNS service is an IP Registry which provides a public central database
where information such as email addresses, hostnames, Ips etc. can be stored and retrieved.
This can be a solution if your DNS server uses an IP associated with dynamic IP. The Dy-
namic DNS service acts like an old-style phone operator: other users call the operator and ask
to speak to you and the operator, who knows your extension, will make the connection. Every
time your computer comes online, it will inform the Dynamic DNS server what the current IP
address is. Users who need to connect to your server, through the DNS service, will be sent to
the right place. Please visit http://www.dyndns.org for more information.
Q: Why “Dynamic DNS”?
A: With Dynamic DNS support, you can have a static hostname alias for a dynamic IP ad-
dress, allowing the host to be more easily accessible from various locations on the Internet.
You must register with a Dynamic DNS Client to use this service. Please go to http://www.
dyndns.org for more information.
Q: What is Wildcard?
A: A wildcard alias is a method that is used to give your hostname multiple identities. If you
were to register yourhost.com, everything (*).yourhost.com would be aliased to yourhost.com.
This includes host names such as www.yourhost.com or ftp.yourhost.com . Once Wildcard
feature was enabled, your host can be reached by *.yourhost.dyndns.org. First, you need to
register a dynamic DNS account with www.dyndns.org. To use this service, you must register
with the Dynamic DNS client. The Dynamic DNS client service provider will give you a pass-
word or key. Refer to what’s Dynamic DNS? Question above for more information.
