Zyxel-communications G.SHDSL.bis 4-port Security Gateway P-793H Instrukcja Użytkownika Pobierz pdf (Strona 146)

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P-793H User’s Guide

146 Chapter 9 Firewall Configuration

Figure 65 Firewall Example: Rules: MyService

9.9 Anti-Probing

If an outside user attempts to probe an unsupported port on your ZyXEL Device, an ICMP

response packet is automatically returned. This allows the outside user to know the ZyXEL

Device exists. The ZyXEL Device supports anti-probing, which prevents the ICMP response

packet from being sent. This keeps outsiders from discovering your ZyXEL Device when

unsupported ports are probed.

Internet Control Message Protocol (ICMP) is a message control and error-reporting protocol

between a host server and a gateway to the Internet. ICMP uses Internet Protocol (IP)

datagrams, but the messages are processed by the TCP/IP software and directly apparent to the

application user.

Refer to Section 8.1 on page 119 for more information.

Click Security > Firewall > Anti Probing to display the screen as shown.

Figure 66 Firewall > Anti Probing

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