Table of Contents
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Glossary
GSM:
Global System for Mobile communications; cellular network for voice
and data transmission.
ICMP:
Internet Control Message Protocol; protocol that is often used to con-
trol a network. The program "ping" uses ICMP for example.
Interface:
A network device that can transport IP connections.
IP address: Internet Protocol address; The IP address of a device in a network un-
der which it can be accessed. It consists of four bytes and is indicated
decimal, (e.g. 192.168.1.1)
IP network: An Ethernet-based interface that can become a LAN or a WAN inter-
face.
ISP:
Internet Service Provider; an ISP can be called using a dial-up connec-
tion (e.g. with an analogue modem or ISDN-TA). The ISP will then pro-
vide access to the Internet via this dial-up connection.
LAN:
Local Area Network; a network of computers which are located rela-
tively close to each other.
LAN interface:
machine network, local network); it is connected to a WAN via the
router.
MAC address:
interface. Each Ethernet interface has a unique global number, the
MAC address.
MSN:
Multiple Subscriber Number. Devices that are active on an So bus re-
quire an answerback code in form of a terminal device number.
Netzmask: Defines a logical group of IP addresses in net address and device ad-
dresses.
Net address: Consists of the overlap of IP address and netmask. It always ends with
"0". The netmask (e.g. 255.255.255.0) is applied in binary form to an IP
address (e.g. 192.168.1.1); the still "visible" part of this overlapping
(masking) is the net address (here: 192.168.1.0).
Network rules:
work device. You can block or redirect data packets to or from certain
network participants for example.
PAP:
Password Authentication Protocol; an authentication protocol often
used for PPP connections.
Port:
(1) Socket at the switch for connecting Ethernet devices.
(2) Part of a socket for data connections
Port forwarding:
special recipients of a network.
94
An interface that is assigned to a local network (plant network,
Media Access Control Address. A MAC is a part of an Ethernet
You decide how the different data packets are handled in a net-
Network rules that redirect data packets from certain senders to
MRX
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