Q&A About The Internet - T&D RTR-5W User Manual

■ Q&A about the Internet
Q.1 What is a fixed IP address?
A
Usually, when you connect to the Internet, the provider with which you have contracted
service automatically assigns an IP address which may be different each time you connect,
or may change after a certain length of time.
With this type of changing IP address, it is more difficult for outsiders to illegally enter your
computer. On the other hand, when using your computer or a RTR-5W unit as a sever,
it would be necessary to enter a different IP address as the URL each time you wish to
access it. In such a case, it would be necessary to find out the current IP address each time
you wished to access and this would be totally inconvenient.
To help solve this problem, there is something called a fixed IP address service that your
provider can offer.
With a fixed IP address, you will be assigned a special unique IP address.
Some providers may give you a fixed IP address from the beginning of service, but with
most providers it is necessary to sign up for this special service.
Q.2 How do you get a fixed IP address?
A
A fixed IP address is a service offered by your Internet provider.
For details about how to receive a fixed IP address, contact the Internet provider with which
you are connected.
Q.3 How should I set up a fixed IP address?
A
If you are using only one RTR-5W connected to one router, then the fixed IP address should
not be set for the RTR-5W, but for the router. If you are using a multiple number of RTR-
5W connected to one router, the RTR-5W will use FTP and HTTP so, please set a fixed IP
address for each RTR-5W unit.
Because it is impossible, when using normal ADSL or FTTH lines, to directly connect the
RTR-5W to the Internet line, it is necessary to place a router between the logger and the
ADSL (FTTH) modem.
When using a router, the fixed Internet IP address should be assigned to the router and
all access to the RTR-5W from outside should go through the router. In this case, the
router will have two IP addresses: an external IP address for the Internet and an internal IP
address for the company or household LAN.
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