Siemens OZW672 Series Commissioning Instructions page 95

Network Address
Translation
PAT
Physical Address
Plant room
Point-to-Point Protocol
Port
Port and Address
Translation
Port Forwarding
PPP
PPP over Ethernet
PPPoE
Private IP address
Protocol
Siemens
Building Technologies
See NAT
PAT or NPAT (Network and Port Address Translation) translates all private network
addresses into one public (dynamic) IP address. In this process, port numbers are
exchanged in addition to addresses when there is a connection. As a result, an
entire private network only requires one single registered public IP address.
See MAC address
The ISP provides the connection to the Internet via DSL or cable TV (at a fee).
See PPP
Ports are used to exchange data between different applications on a network. The
port number addresses the application within a network device. The combination of
IP address and port number serves as a unique identification of the recipient or the
sender of the data package with the network.
Internet service applications work with set port numbers (HTTP 80, FTP 21).
See http://www.iana.org/assignments/port-numbers
Port numbers 0 to 49151 are set and reserved, port numbers 49152 to 65535 are
dynamic (and therefore available).
See PAT
With port forwarding, the router forwards data packages from the Internet, destined
for a particular port, to the port of the responsible network device. As a result, serv-
ers (web server) integrated in a LAN, can be reached from the Internet (without a
need for a public IP address). Port Forwarding is achieved by the correct NAT /
PAT definition in the router.
Protocol for dial-up connection of a computer to the ISP.
See PPPoE
Protocol used to connect to the Internet via ADSL or DSL.
The private IP address (local IP address) is the address of a network device on a
local network (LAN). The provider assigns this address at will. DSL routers have a
public IP address for the WAN and a private IP address for the LAN. The following
IP ranges are recommended for private IP addresses:
10.0.0.0...10.255.255.255  Class A.
172.16.0.0...172.31.255.255  Class B.
192.168.0.0...192.168.255.255  Class C.
The first IP address xxx.xxx.xxx.0 and the last IP address xxx.xxx.xxx.255 in a
network segment cannot be used, as xxx.xxx.xxx.0 is reserved for the network and
xxx.xxx.xxx.255 for broadcasting.
A protocol describes the type of communication on a network. It contains rules on
opening, managing, and closing a connection, on data formats, time sequences,
and possible error correction. Different protocols are needed to allow two applica-
tions at different levels to communicate with each other, e.g. TCP/IP protocols on
the Internet.
Web server
Appendix
for registered port numbers.
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