NETGEAR DGFV338 ProSafe Reference Manual page 163

DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual
Port Forwarding
The firewall always blocks DoS (Denial of Service) attacks. A DoS attack does not attempt to steal
data or damage your PCs, but overloads your Internet connection so you can not use it (i.e., the
service is unavailable). You can also create additional firewall rules that are customized to block or
allow specific traffic.
Warning: This feature is for Advanced Administrators only! Incorrect configuration
will cause serious problems.
You can control specific inbound traffic (i.e., from WAN to LAN and from WAN to DMZ).
Inbound Services lists all existing rules for inbound traffic. If you have not defined any rules, only
the default rule will be listed. The default rule blocks all inbound traffic.
Each rule lets you specify the desired action for the connections covered by the rule:
• BLOCK always
• BLOCK by schedule, otherwise Allow
• ALLOW always
• ALLOW by schedule, otherwise Block
You can also enable a check on special rules:
• VPN Passthrough – Enable this to pass the VPN traffic without any filtering, specially used
when this firewall is between two VPN tunnel end points.
• Drop fragmented IP packets – Enable this to drop the fragmented IP packets.
• UDP Flooding – Enable this to limit the number of UDP sessions created from one LAN
machine.
• TCP Flooding – Enable this to protect the router from Syn flood attack.
• Enable DNS Proxy – Enable this to allow the incoming DNS queries.
• Enable Stealth Mode – Enable this to set the firewall to operate in stealth mode.
As you define your firewall rules, you can further refine their application according to the
following criteria:
• LAN users. These settings determine which computers on your network are affected by this
rule. Select the desired IP Address in this field.
• WAN Users. These settings determine which Internet locations are covered by the rule, based
on their IP address.
Router and Network Management
v1.0, May 2008
6-5