User`s guide

Security
This screen allows you to set Firewall and other security-related options.
Figure 54: Security Screen
Data - Security Screen
DoS Firewall
Enable DoS
Firewall
If enabled, DoS (Denial of Service) attacks will be detected and
blocked. The default is enabled. It is strongly recommended that
this setting be left enabled.
Note:
• A DoS attack does not attempt to steal data or damage your
PCs, but overloads your Internet connection so you can not
use it - the service is unavailable.
• This device uses "Stateful Inspection" technology. This
system can detect situations where individual TCP/IP pack-
ets are valid, but collectively they become a DoS attack.
Firewall Set-
tings Button
If you wish to adjust the settings used by the DoS firewall, click
this button to open a sub-window.
Options
Respond to
ICMP
The ICMP protocol is used by the "ping" and "traceroute" pro-
grams, and by network monitoring and diagnostic programs.
• If checked, the Wireless Router will respond to ICMP pack-
ets received from the Internet.
• If not checked, ICMP packets from the Internet will be ig-
nored. Disabling this option provides a slight increase in
security.
Allow VPN
Pass through
The IPSec, PPTP, and L2TP protocols are used to establish a
secure connection, and are widely used by VPN (Virtual Private
Networking) programs.
• If checked, these VPN connections are allowed.
• If not checked, these VPN connections are blocked.
Note: IPSec sessions must NOT use AH (Authentication
Header). Packets using AH cannot be routed correctly.
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