Netgear STM150 User Manual download pdf (Page 157)

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101

Firewall Protection

157

ProSecure Unified Threat Management (UTM) Appliance

Attack Checks, VPN Pass-through, and Multicast Pass-through

The Attack Checks screen allows you to specify whether the UTM should be protected

against common attacks in the DMZ, LAN, and WAN networks, and lets you configure VPN

pass-through and multicast pass-through. The various types of attack checks are listed on

the Attack Checks screen and defined in Table 30 on page 157.

 To enable the appropriate attack checks for your network environment:

1. Select Network Security > Firewall > Attack Checks. The Attack Checks screen

displays:

Figure 83.

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

Table 30. Attack Checks screen settings

Setting Description

WAN Security Checks

Respond to Ping on

Internet Ports

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

respond to a ping from the Internet. A ping can be used as a diagnostic tool. Keep

this check box cleared unless you have a specific reason to enable the UTM 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 UTM 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 to enable the UTM to drop all invalid TCP

packets and to protect the UTM 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. By default, the Block TCP flood check box is

cleared.

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