Specifications

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KNOW-HOW: Remote Access
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S19
The access
In order to understand the access to a distant server, we show the
process in different steps:
Step 1: the connection to the router A on the DVR side
If the router A has been given a fixed IP address, this address has to
be entered into the respective programme only.
Even though, this is the most simple case, in practical operation, most
of the routers are connected to the Internet with a dynamic IP address.
This means, that the access is not as simple, because the IP address is
unknown. It is just like trying to call somebody without knowing the
telephone number. What can you do? We call somebody who knows
the number and get connected. This is exactly the method which can
be used with dynamic addresses on the Internet.
Dyndns.org
For this purpose, various providers offer their services. At the moment,
the most popular provider is the English-speaking dyndns.org . A serv-
ice is offered under this domain which is free of charge at the moment
and allows to convert a dynamic IP address into a static subdomain.
You have to register with them and receive a user name and password.
After logging in, select the service Dynamic DNS. You can now set
up a subdomain by selecting ”create Hosts“. This subdomain consists
of two parts. Let’s assume we would like to work with the domain
video-test.dyndns.org
.
The first part would be video-test
, the second part is dyndns.org . The
first part can be selected as desired. With the second part, numerous
suggestions are made from which we can select as desired. If the com-
bination is still available, we can reserve this combination.
This data, i.e. user name, password, and name of domain are now
entered into the router. This router must support DNS or also DDNS.
For information on this subject, please refer to the instruction manual
of the router.
After entering the data successfully, the following scenario can be seen
(see graphic 2):
When the router connects to the Internet, it sends the allocated IP ad-
dress to the DYNDNS service (B) at the same time. This IP address and
the subdomain which has previously been set up are now intercon-
nected.
In order to access the unit now, enter the address of the subdomain into
the Internet explorer on the side Remote, like e.g. video-test.dyndns.org. By
designing a subdomain, this request is automatically sent to dyndns.org
(A). Without entering any more data, the request is sent to the IP ad-
dress of the DVR router (C). Now, when the provider interrupts the con-
nection, the router automatically sends a new IP address to dyndns.org
and the user can directly access the unit again.
The advantage of this method is, that each user only has to remember
the subdomain. This can be set up as a bookmark like any other ad-
dress and send as a link.