beautypg.com

Mbps, Network adapter, Ur 10/100 – Siemens SE505 User Manual

Page 125: Port forwarding, Port

background image

129

Glossary

Gigaset SE505 dsl/cable / English / A31008-E505-B100-1-7619 / glossary.fm / 16.07.2003

Mbps
Million bits per second
The transmission speed in a network.
MRU
Maximum Receive Unit
The MRU defines the maximum user data volume within a data packet.
MTU
Maximum Transmission Unit
The MTU defines the maximum length of a data packet that can carried 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. Because 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 SE505 dsl/cable 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 area networks (

LAN

) and wide-area networks (

WAN

).

Network adapter
The network adapter is the hardware device that connects a network component to a

local area network. The connection can be wired or wireless. An Ethernet network card

is an example of a wired network adapter. The Gigaset PC Card 54 and the Gigaset PCI

Card 54 are examples of wireless network adapters.
A network adapter has a unique address, the

MAC 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 SE505 dsl/cable 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 within the local area network to offer services

on the Internet without them needing a

Public IP address

.

See also:

Virtual server