ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 257)

In the case where NAT and DHCP functionalities are not built into the Internet

modem or the InternetBox used as an Internet access gateway, it is still possible to

use them, but by configuring a dedicated computer acting as a gateway, as illus-

trated in Figure 10.24.

To configure such a dedicated computer, the best solution is to use Linux, the

various distributions of which provide NAT and DHCP functionalities, whereas

chargeable software must be used under Windows. The other advantage of Linux is

that the system does not require tremendous resources.

To configure a computer using NAT and incorporating a DHCP server, a 486

generation processor and 32 Mb of memory are more than enough. Another advan-

tage: this computer can remain switched on all the time without encountering any

bugs.

DHCP (Dynamic Host Configuration Protocol)

The DHCP protocol is used for dynamically providing IP parameters to the stations

connecting to the network. This protocol is used more and more since it makes net-

work administration easier, in particular when a rather high number of computers

are administered.

DHCP was originally designed to complete another protocol, BOOTP (Boot

strap Protocol), used in the same spirit. The BOOTP messages are compatible with

DHCP but not the reverse. The difference between DHCP and BOOTP is that

238 PLC in the Home

Figure 10.22 Configuring home network IP addresses

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 257