ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 250)

To test the good operation of the PLC network, it can also be useful to run

“Ping” commands from the PC connected to the PLC network to the InternetBox as

illustrated in Figure 10.13.

For this purpose, all the PCs or terminals must be in the same addressing plane

as the InternetBox (for example, for an IP network of the 192.168.10.x type, the

InternetBox is in IP = 192.168.10.1 and the other devices in IP = 192.168.10.100,

101, 102, and so forth). The configuration of the network address (or IP) for a PC is

detailed in Chapter 9.

To start the “Ping” command, just proceed as follows:

•

Click on “Start” then on “Execute.”

•

Enter cmd. A DOS window opens.

•

Enter the following command:

C:\>ping 192.168.10.1

Pinging 192.168.10.1 with 32 bytes of data :

Reply of 192.168.10.1 : bytes=32 time=3 ms TTL=64

Reply of 192.168.10.1 : bytes=32 time=2 ms TTL=64

If replies are sent back with this command, this means that the network links are

configured and ready to be used by applications.

Firewall

The connection to the Internet network can provide access to the home network to

ill-intentioned people. The only solution to prevent these attacks consists of using a

firewall. The purpose of a firewall is to authorize certain protocols only, within the

home network, depending on the port number used.

Each protocol uses a specific port number (e.g., port 80 for HTTP [hypertext

transfer protocol] which enables it to be recognized as such by the network). By only

authorizing certain ports and therefore certain applications, such as electronic mail,

HTTP, or FTP, all the other ports are prohibited.

Among the many firewalls available on the market, there are free ones such as

those available in Linux distributions using a 2.4 or 2.6 kernel.

Windows XP enables you to establish software firewalling rules for a station’s

network connection but not for the entire network, unlike hardware firewalls,

which can prohibit a protocol for an entire network.

To access the Windows XP software firewall, just proceed as follows:

In the Configuration panel, select “Network connection” to display the win-

dow illustrated in Figure 10.14.

Select “Ethernet network connection” to display the dialogue box illustrated in

Figure 10.15.

Click on the “Advanced” tab and click on “Settings” to display the Windows

Firewall dialog box as illustrated in Figure 10.16.

In the “General” tab, tick the “On” box (recommended).

Configuring Security Parameters 231

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 250

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