ZyXEL NBG6503 User Guide - Page 131

Services Screen

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Chapter 17 Firewall 17.5 Services Screen If an outside user attempts to probe an unsupported port on your Router, an ICMP response packet is automatically returned. This allows the outside user to know the Router exists. Use this screen to prevent the ICMP response packet from being sent. This keeps outsiders from discovering your Router 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 > Services. The screen appears as shown next. Figure 92 Security > Firewall > Services The following table describes the labels in this screen. Table 56 Security > Firewall > Services 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. Respond to Ping on The Router will not respond to any incoming Ping requests when Disable is selected. Select LAN to reply to incoming LAN Ping requests. Select WAN to reply to incoming WAN Ping requests. Otherwise select LAN & WAN to reply to all incoming LAN and WAN Ping requests. Apply Click Apply to save the settings. NBG6503 User's Guide 131

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Chapter 17 Firewall
NBG6503 User’s Guide
131
17.5
Services Screen
If an outside user attempts to probe an unsupported port on your Router, an ICMP response packet
is automatically returned. This allows the outside user to know the Router exists. Use this screen to
prevent the ICMP response packet from being sent. This keeps outsiders from discovering your
Router 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
>
Services
. The screen appears as shown next.
Figure 92
Security > Firewall > Services
The following table describes the labels in this screen.
Table 56
Security > Firewall > Services
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.
Respond to
Ping on
The Router will not respond to any incoming Ping requests when
Disable
is selected. Select
LAN
to reply to incoming LAN Ping requests.
Select
WAN
to reply to incoming WAN Ping
requests. Otherwise select
LAN & WAN
to reply to all incoming LAN and WAN Ping
requests.
Apply
Click
Apply
to save the settings.