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Gigaset SE587 WLAN dsl / eng / A31008-N1083-L171-1-7619 / glossary.fm / 12.12.2007
Glossary
NAT
Network Address Translation
NAT is a method for converting IP addresses
(Private IP
addresses) within a network into
one or several
Public IP addresses
on the Internet. With NAT, several network compo-
nents in a
LAN
can share the router's public IP address to connect to the Internet. The
network components of the local network are hidden behind the router's IP address reg-
istered on the Internet. Because of this security function, NAT is frequently used as part
of the
Firewall
of a network. If you want to make services on a PC in the local network
available on the Internet despite NAT, you can configure the Gigaset SE587 WLAN dsl as
a
Virtual
server.
Network
A network is a group of devices connected in wired or wireless mode so that they can
share resources such as data and peripherals. A general distinction is made between
local networks (LANs) and wide-area networks (WANs).
Network adapter
The network adapter is the hardware device that creates the connection between a net-
work component and a local network. The connection can be wired or wireless. An Eth-
ernet network card is an example of a wired network adapter. The Gigaset PC Card 108
and the Gigaset USB Adapter 108 are examples of wireless network adapters.
A network adapter has a unique address, the
MAC
address.
Public IP address
The public
IP address
(also known as the global IP address) is a network component's
address on the Internet. It is assigned by the
Internet service
provider. Devices that cre-
ate a link from a LAN to the Internet, such as the Gigaset SE587 WLAN dsl, have a public
and a
Private IP
address.
Port
Data is exchanged between two applications in a network across a port. The port
number addresses an application within a network component. The combination of
IP
address/port number uniquely identifies the recipient or sender of a data packet within
a network. Some applications (e.g. Internet services such as HTTP or FTP) work with
fixed port numbers; others are allocated a free port number whenever they need one.
Port forwarding
In port forwarding, the Gigaset SE587 WLAN dsl directs data packets from the
Internet
that are addressed to a particular
Port
to the corresponding port of the appropriate net-
work component. This enables servers within the local network to offer services on the
Internet without them needing a
Public IP
address.
See also:
Virtual server
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