ZyXEL NBG6515 User Guide - Page 129
MAC Filtering Rule Screen
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Chapter 19 Firewall Table 63 Security > Firewall > General LABEL DESCRIPTION ICMP Internet Control Message Protocol 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. Enable ICMP (WAN Ping) Select this check box to activate the ICMP. The NBG will respond to WAN incoming Ping requests. Apply Click Apply to save the settings. Reset Click Reset to start configuring this screen again. 19.5 MAC Filtering Rule Screen If an outside user attempts to probe an unsupported port on your NBG, an ICMP response packet is automatically returned. This allows the outside user to know the NBG exists. Use this screen to prevent the ICMP response packet from being sent. This keeps outsiders from discovering your NBG when unsupported ports are probed. You can also use this screen to enable service blocking, enter/delete/modify the services you want to block and the date/time you want to block them. Click Security > Firewall > MAC Filtering Rule. The screen appears as shown next. Figure 98 Security > Firewall > MAC Filtering Rule NBG6515 User's Guide 129