Netgear FVS318N – Prosafe Wireless N VPN Firewall 참조 매뉴얼

Enter the settings as described in the following table:

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.