Siemens Gigaset SE587 WLAN dsl Specifications download pdf (Page 78)

Glossary

Gigaset SE587 WLAN dsl / eng / A31008-N1083-L171-1-7619 / glossary.fm / 12.12.2007

Schablone 2004_08_26

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.

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Siemens Gigaset SE587 WLAN dsl Specifications Page 78