Choosing An Ip Address - Alcatel Speed Touch Wireless User Manual

11.1.3

Choosing an IP Address

Introduction
Use of public IP
addresses
Use of private IP
addresses
Simultaneous use of
public & private IP
addresses
3EC 17766 AAAA TCZZA Ed. 01
Regardless of your application, IP addresses must always be
configured at both ends of the connection.
Prior to configuring an IP address, you must choose a suitable
one. In this subsection a few criteria are listed that may influence
your choice.
Public IP addresses are required when accessing the Internet. Each
PC on the Internet must have a unique IP address. If not, IP
packets cannot be routed.
For end to end IP communication your ISP or LAN administrator
will supply you with a Public IP address.
Private IP addresses are to be used for local IP communication.
E.g. configuring the STWireless, or dumping files to your local
printer.
For this purpose it is best to choose addresses from the private
ranges.
Further, all examples will be given with 10.x.x.x private addresses,
sometimes referred to as Net10" IP addresses.
In most networking scenario's, Private and Public IP addresses will
be in use simultaneously, e.g.:
PPPoA to PPTP Relaying
"
In this configuration, one IP layer is carried into another.
Otherwise stated: on your local (home) (W)LAN the Public IP
layer is carried inside a Private IP layer (a so called IP Tunnel).
PPP & IP Routing
"
In this scenario the Public IP layer will be terminated in the
STWireless and translated into a Private IP layer via the NAPT
translation feature of the STWireless.
11 Networking Services - IP
199 / 362