Aastra OpenCom 100 series, Mounting And Commissioning User Manual

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Configuration Examples
95
The domain name system (DNS) resolves a plain text DNS name into an IP address.
The DNS is a hierarchically structured database, distributed worldwide. A DNS server
can supply information on the names and IP addresses for which it is responsible. For
all other information, a DNS server contacts other DNS servers. For the establishment
of every connection from the workstation, it is possible to give either an IP address, or
a name that a DNS server resolves into an IP address.
Note
For further explanations of technical terms, refer to the Glossary on the CD supplied.
OpenCom 100 in a Serverless LAN
In a peer-to-peer network, the workstations are connected to one another via
network cables. In many networks, the cables run in the form of a star from a central
hub or switch. Such networks do not require special servers. This configuration
example is also valid for a LAN with a server using a protocol other than IP (e.g.
AppleTalk or IPX/SPX).
The OpenCom 100 in a serverless LAN
In a serverless LAN, the OpenCom 100 takes over the IP configuration of the con-
nected workstations. All IP settings necessary for the workstations are assigned by the
OpenCom 100 via DHCP (dynamic host configuration protocol). In this operating
mode, an IP address space reserved for such networks is used:
OpenCom
(DHCP, RAS,
int. DNS, Internet)
S
0
Net
PC 2
Net
ISP
(DNS)
S
0
Ext.
PC
S
0
PC 1
Net Hub