Netgear Modem FVS318N User Manual download pdf (Page 167)

100

101

Firewall Protection

167

ProSafe Wireless-N 8-Port Gigabit VPN Firewall FVS318N

IPv4 Attack Checks

 To enable IPv4 attack checks for your network environment:

1. Select Se

curity > Firewall > Attack Checks. In the upper right of the screen, the IPv4

radio button is selected by default. The Attack Checks screen displays the IPv4 settings:

Figure 88.

2. Enter the settings as explained in the following table:

Table 35. Attack Checks screen settings for IPv4

Setting Description

WAN Security Checks

Respond to Ping on

Internet Ports

Select the Respond to Ping on Internet Ports check box to enable the wireless

VPN firewall to respond to a ping from the Internet to its IPv4 address. A ping can be

used as a diagnostic tool. Keep this check box cleared unless you have a specific

reason to enable the wireless VPN firewall to respond to a ping from the Internet.

Enable Stealth Mode Select the Enable Stealth Mode check box (which is the default setting) to prevent

the wireless VPN firewall from responding to port scans from the WAN, thus making

it less susceptible to discovery and attacks.

Block TCP flood Select the Block TCP flood check box (which is the default setting) to enable the

wireless VPN firewall to drop all invalid TCP packets and to protect the wireless VPN

firewall from a SYN flood attack.

A SYN flood is a form of denial of service attack in which an attacker sends a

succession of SYN (synchronize) requests to a target system. When the system

responds, the attacker does not complete the connections, thus leaving the

connection half open and flooding the server with SYN messages. No legitimate

connections can then be made.

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