Siemens OZS164 SERIES WEB SERVER Commissioning Instructions page 102

MAC address
Mbps
Media Access Control
NAT
Network
Network adapter
Network Address
Translation
PAT
Physical address
Point-to-Point Protocol
Port
Port and Address
Translation
Port Forwarding
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The MAC address allows for worldwide identification of a network adapter (network
card). It consist of hexadecimal numbers, grouped in six portions at 2x4 bit each,
thus 48 bit, e.g. 00-55-96-5D-00-2C. The MAC address is assigned by the network
adapter manufacturer and cannot be changed.
Million bits per second indicates the transmission rate in a network.
See MAC address
NAT is a method to translate IP addresses (private IP addresses) in a network into
one or several public IP addresses on the Internet. NAT allows us to use several
network devices in a LAN together with a public IP address of a router for Internet
access.
The network devices of the local network are masked by the IP address (router)
registered on the Internet. Thanks to this security function, NAT often is used as a
part of a network's firewall. Web server is accessible from a public network thanks
to the correct NAT table definition; see also port forwarding.
A network (LAN, WAN) is a linked group of devices connected via various lines or
radio sharing common resources such as data or peripheral devices.
Hardware to connect network components to a local area network (LAN).
Connection can be wired or wireless.
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
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,
servers (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.
Web server
Appendix
for registered port numbers.
CE1C5711en
25.08.2010