elmeg IP140 / en / elmeg140_v1 / glossary.fm / 09.04.2014
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Glossary
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 line 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 inter-
nal IP addresses and port numbers – depending on the external target address.
T
TCP
Transmission Control Protocol
Transport protocol
. Session-based transmission protocol: it sets up, monitors and termi-
nates 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 measured in
data units per unit of time (Mbit/s).
Transport protocol
Controls data transport between two communication partners (applications).
See also:
UDP
,
TCP
,
TLS
.
