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Q.4 I want to use a URL without a fixed IP address, how can I do that?
A
If you wish to access an RTR-5W by URL but without a fixed IP address, it is possible to
use a dynamic DNS.
The DNS or Domain Name Server helps to switch difficult to understand IP address of just
numbers, such as "61.197.203.107" into easy to grasp names such as "www.tandd.co.jp"
and helps connect to the desired server.
The DNS usually changes names to fixed IP addresses.
But, if for some reason you cannot use a fixed IP address or for security reasons you wish
not to use a fixed IP address, there is a type of DNS called a dynamic DNS, which can
handle ever-changing IP addresses.
For example, the starting IP address is "210.0.0.1" and the URL associated with it is "http://
www.rtr5w.com".
The IP address "210.0.0.1" is of the changing type that is periodically reassigned by the
provider. After a certain period of time the assigned IP address is changed to "210.0.0.2".
Normally, at this point the DNS would not associate the URL with the IP address and
access would be made impossible, but because the dynamic DNS tracks the IP address
you can still access the desired server using the same URL.
There are many types of dynamic DNS plans and services available, please contact your
local provider for more details.
Q.5 Can I use the Warning Mail function without getting or using a fixed IP
address?
A
If it is possible for you to connect to the Internet by using a dynamic DNS, theoretically it
is possible to send mail without having or using a fixed IP address. That is presuming it is
possible to successfully send data via your provider's mail sever or your company's mail
server.
Fundamentally, if you are able to access your company mail server or connect to the
Internet it should be possible to send mail.
Q.6 Is it possible to connect to the Internet without a fixed IP address or an
URL?
A
Yes it is possible to connect without using a URL or having a fixed IP address, but because
the IP address that will be assigned by the provider will be constantly changing, the access
will be varied and will not go smoothly.
For example, the IP address that you used successfully one hour before may no longer
work and access will be made impossible. Further, you will have no way of verifying the new
IP address.
We strongly suggest using either a fixed IP address or a dynamic DNS.
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