Pppoe, Pptp, Network adapter – Siemens SE105 User Manual

Page 106: Port

105

Glossary

Gigaset Router / de / A31008-E105-B100-2-19 / glossary.fm / 05.06.2003

Specification of the transmission speed in a network.
MTU
Maximum Transmission Unit
The MTU defines the maximum length of a data packet that can transported over the

network at a time.
NAT
Network Address Translation
NAT is a method for implementing IP addresses (mostly

Private IP addresses

) in a

network on one or more

Public IP addresses

on the

Internet

. With NAT several network

components 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

registered on the Internet. As a result of this security function NAT is frequently used as

part of the network

Firewall

. If you want to make services on a PC in the local network

available on the Internet despite NAT, you can configure the Gigaset Router 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 files and peripherals. A general distinction is made between

local networks (

LAN

) and wide-area networks (

WAN

Network adapter
The network adapter is the hardware device that realises the connection of a network

component to a local network. The connection can be wired or wireless. A wired

network adapter is for example an Ethernet network card. Wireless network adapters are

for example the Gigaset USB Adapter 11 and the Gigaset PC Card 11.
A network adapter has a unique address, the

MAC address

Port
Data is exchanged between two applications in a network via a Port. The port number

addresses an application within a network component. The combination

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 every time they need one.
Port Forwarding
In Port Forwarding the Gigaset Router directs data packets from the

Internet

that are

addressed to a particular

Port

to the corresponding port of the appropriate network

component. This enables servers on the local network to offer services on the Internet

without them needing a

Public IP address