Internet Access; Ras Access - DETEWE OpenCom 130 Mounting And Commissioning Manual

OpenCom 130 responds with the
correct IP address, so that the Con-
figurator home page can be called
up.
In a peer-to-peer network (Windows
network), the workstations each
have a name which is displayed in
the network environment. These
NetBIOS names can differ from the
DNS names assigned to the worksta-
tions by the OpenCom 130. The
OpenCom 130 is not visible in the
network environment.

Internet Access

If access to an ISP has been config-
ured on the OpenCom 130, the
OpenCom 130 can be operated as an
Internet access server without any
additional configuration of the
workstations. When you want to see
a Web page, you simply type the URL
(uniform resource locator; Internet
address; "http://...") in your browser.
In a serverless LAN, the
OpenCom 130 is configured as a DNS
server and default gateway. The
workstation therefore sends its In-
ternet connection request to the
OpenCom 130.
In almost all cases, the request will
contain a DNS name which is un-
known in the internal network.
When you type a URL into your
browser, the OpenCom 130 receives
the request to find the correspond-
ing IP address. If the name is un-
68
OpenCom 130 in a Serverless LAN
known in the LAN, the request is for-
warded to an ISP's external DNS
server.
Note: Workstation PCs automati-
cally add a domain name to URLs
without a dot. You specify this do-
main name in the Configurator. For
example, if you have configured
"firm.co.uk" as the domain name, an
access request for "www.firm.co.uk"
will be interpreted as a local DNS re-
quest which does not lead to the es-
tablishment of an Internet connec-
tion. For this reason, you should
choose a name which is not used in
the Internet as the domain name
("firm-opencom.co.uk" for example).

RAS Access

You can establish a connection from
an external computer with an ISDN
card to the OpenCom 130. The nec-
essary TCP/IP settings are transmit-
ted by the OpenCom 130 on estab-
lishment of the connection. The
computer that has dialled in now
has access to all services in the LAN
capable of being used via TCP/IP. The
authorisation for RAS access is set up
in the Configurator via the User
Manager: User Groups menu.
In a serverless LAN, Windows uses
the NetBIOS protocol for accessing
files and printers via the network en-
vironment. NetBIOS can use Net-
BEUI, IPX/SPX or TCP/IP as the trans-
port protocol. In the network
Configuration Examples