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Glossary
Private IP
Address
Public IP
Address
Subnetwork
FRITZ!Box Fon WLAN 7270
service for access to incoming data packets and thus keep
it open permanently. The private IP address of the given
computer must be saved as the destination address for all
of the packets arriving at the port.
Typical server applications which require port forwarding
are FTP and Web servers. To allow access to a computer via
remote management software like Symantec's pcAnywhere
or Microsoft's Remote Desktop, or even use of a file-sharing
program like eDonkey, the required ports must be released
for port forwarding. Port forwarding settings for the most
important application cases are quite simple as long as the
settings of the router or the firewall already contain rules
with a corresponding preconfiguration.
Private IP addresses are used for computers and other net-
work devices within local IP networks.
Since many local IP networks are not connected to the In-
ternet except via single computers or routers (gateway), cer-
tain address ranges are excluded from the publicly avail-
able IP addresses so that they are available for assignment
in local IP networks. An IP address may only be assigned
once within the local network. A private IP address may ex-
ist in any number of other local networks.
A public IP address is an IP address valid in the Internet. Ev-
ery computer or router participating in the Internet must
have a uniquely assigned public IP address. This address is
usually negotiated dynamically with the Internet Service
Provider when a connection to the Internet is dialed. The In-
ternet Service Provider assigns the negotiated IP address to
the computer or router for the duration of an Internet ses-
sion.
A local IP network can consist of one subnetwork or be di-
vided into multiple subnetworks. The division into subnet-
works is performed when the local IP network is configured.
The subnetworks of a local IP network are also IP networks.
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