Auerswald COMpact 4000 Operation Manual page 765

HTTP Proxy
An HTTP proxy is a proxy for the HTTP protocol, over which Internet sites are called or files
downloaded.
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Internal
In the field of telecommunications, a connection or subscriber that is connected to a PBX and
is reachable over a PBX without using the public telecommunication network is called an
internal subscriber.
IPv4 Address
In order to ensure that the data packets reach the correct recipients, all of the devices in a TCP/
IP network require a unique address, known as the IP address. IPv4 addresses comprise four
numbers between 0 and 255 that are separated by a point, for example, 192.168.0.14. The
network addresses are divided up into different classes (Class A to C) depending on how many
computers can be located in a network.
Certain ranges are reserved for the operation of local networks:
• Class A: 10.x.x.x (for networks with up to 16.5 million PCs)
• Class B: 172.16.x.x to 172.31.x.x (for networks with up to 65534 PCs)
• Class C: 192.168.0.x to 192.168.255.x (for networks with up to 254 PCs)
These addresses have no validity on the Internet; this means that data packets with this sender
type or recipient address cannot be transported on the Internet. However, they can be used in
local networks without restriction. The advantage of this is that if data from a local network
configured in this way comes in contact with the Internet, none of the data on the computers in
the local network can leak out or be accessed externally.
COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016
Glossary
Terminology
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