Manual AVM FRITZBox Fon WLAN 7570 vDSL (page 149 of 159) (English)

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Glossary

FRITZ!Box Fon WLAN 7570 vDSL 149

IP network A network in which data exchange takes place on the basis

of the Internet Protocol is called an IP network.

Port So that a single network connection on a connection can be

used by multiple applications to exchange data with re-

mote sites at the same time, a computer administers what

are known as ports for the IP-based protocols TCP and UDP.

Ports substantiate the point of access for the data packets

delivered via the IP Internet protocol. While the IP address

determines the destination computer quite generally, the

port addresses the communication interface provided by

an application for a certain communication procedure.

The Internet protocol allots 16 bits for the specification of

the port number. Thus a total of 65,535 different port num-

bers can be specified. Ports up to port number 1,024 are re-

served for special system applications and typical Internet

applications. These include, for instance, the port numbers

21 for FTP (File Transfer Protocol), 25 for SMTP (Simple Mail

Transfer Protocol), 53 for DNS (Domain Name Service) and

80 for HTTP (Hypertext Transfer Protocol).

Ports are primarily of interest to users for their role in pro-

tecting an Internet connection from external attacks. Most

firewalls offer the possibility of preventing data traffic on

certain ports. This means that certain port numbers can be

blocked to prevent data from being delivered to system ser-

vices. This is also a way of preventing any Trojans (mali-

cious applications opening backdoors on a computer) that

may have infected your computer from receiving data on

ports it created as means of accessing your computer for

potentially damaging activities. A firewall blocks most atyp-

ical port numbers not required for normal operation of an

application and offers specialized users the opportunity to

forward specified ports.

Port forwarding With port forwarding it is possible to specify ports that will

allow all incoming or outgoing data packets to pass through

a router or firewall.

If a computer from the local network offers server services,

for instance, the configuration of a router using NAT or IP

masquerading must forward the port used by the server

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AVM FRITZBox Fon WLAN 7570 vDSL Manual

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