User's Manual

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, an IP Registry provides a public central
database where information such as email addresses, hostnames, Ips etc. can
be stored and retrieved. This solves the problems if your DNS server uses an
IP associated with dynamic IP. The Dynamic DNS service acts like old-style
phone operators: 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
magic of 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 address, allowing the host to be more easily accessible from
various locations on the Internet. You must register with a Dynamic DNS Client
to sue 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 password or key. Refer to what’s Dynamic DNS?
Question above for more information.
Q: What’s MX (Mail Exchanger)? And why MX?
A: The Internet email system for both machines and network connections are
prone to error. With this, a chain of email hubs into the email architecture is
thus built. If the “primary” mail host goes down, instead of queuing up the mails
in the unreliable host on the Internet, they get sent to the “secondary” or