Operation Manual

132

Glossary

Gigaset N510 IP PRO / engbt / A31008-M2217-R101-4-7619 / Glossary.fm / 26.04.2012

Version 5, 23.09.2008

STUN

Simple Transversal of UDP over NAT

NAT control mechanism.

STUN is a data protocol for VoIP telephones. STUN replaces the private IP address in the

VoIP telephone data packets with the public address of the secure private network. To

control data transfer, a STUN server is also required on the Internet. STUN cannot be

implemented with symmetric NATs.

See also: ALG, Firewall, NAT, Outbound proxy.

Subnet

Segment of a Network.

Subnet mask

IP addresses consist of a fixed network number and a variable subscriber number. The

network number is identical for all Network subscribers. The size of the network

number part is determined in the subnet mask. In the subnet mask 255.255.255.0, for

example, the first three parts of the IP address are the network number and the last

part is the subscriber number.

Symmetric NAT

A symmetric NAT assigns different external IP addresses and port numbers to the same

internal IP addresses and port numbers – depending on the external target address.

TCP

Transmission Control Protocol

Transport protocol. Session-based transmission protocol: It sets up, monitors and ter-

minates a connection between sender and recipient for transporting data.

TLS

Transport Layer Security

Protocol for encrypting data transmissions on the Internet. TLS is a superordinate

Transport protocol.

Transmission rate

Speed at which data is transmitted in the WAN or LAN. The transmission rate is meas-

ured in data units per unit of time (Mbit/s).

Transport protocol

Controls data transport between two communication partners (applications).