ZyXEL P-870HW-I Manual do Utilizador descarregar pdf (Página 162)

P-870HW-I1 User’s Guide

162 Chapter 11 Firewalls

Figure 90 Security > Firewall > Anti Probing

The following table describes the labels in this screen.

11.7 Firewall Threshold Screen

Use this screen to set various DoS thresholds and the maximum number of half-open sessions.

To open this screen, click a rules number in Security > Firewall > Threshold.

Table 69 Security > Firewall > Anti Probing

LABEL DESCRIPTION

Respond to PING

The ZyXEL Device does 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 both incoming LAN and WAN Ping

requests.

Do Not Respond to

Requests for

Unauthorized

Services.

Select this option to prevent hackers from finding the ZyXEL Device by probing for

unused ports. If you select this option, the ZyXEL Device will not respond to port

request(s) for unused ports, thus leaving the unused ports and the ZyXEL Device

unseen. By default this option is not selected and the ZyXEL Device will reply with

an ICMP Port Unreachable packet for a port probe on its unused UDP ports, and a

TCP Reset packet for a port probe on its unused TCP ports.

Note that the probing packets must first traverse the ZyXEL Device's firewall

mechanism before reaching this anti-probing mechanism. Therefore if the firewall

mechanism blocks a probing packet, the ZyXEL Device reacts based on the

corresponding firewall policy to send a TCP reset packet for a blocked TCP packet

or an ICMP port-unreachable packet for a blocked UDP packets or just drop the

packets without sending a response packet.

Apply Click Apply to save your changes back to the ZyXEL Device.

Cancel Click Cancel to begin configuring this screen afresh.

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ZyXEL P-870HW-I Manual do Utilizador Página 162