Features That Increase Traffic - NETGEAR FVS336Gv1 - ProSafe Dual WAN Gigabit Firewall Reference Manual

ProSafe Dual WAN Gigabit Firewall with SSL & IPsec VPN FVS336G Reference Manual

Features That Increase Traffic

Features that tend to increase WAN-side loading are as follows:
• Port forwarding
• Port triggering
• Exposed hosts
• VPN tunnels
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 (that is, the
service is unavailable). You can also create additional firewall rules that are customized to block or
allow specific traffic. (See
for the procedure on how to use this feature.)
Warning: This feature is for advanced administrators only! Incorrect configuration will
cause serious problems.
You can control specific inbound traffic (that is, from WAN to LAN). The LAN WAN Rules
screen 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. Passes the VPN traffic without any filtering, specially used when the VPN
firewall is located between two VPN tunnel end points.
• Drop fragmented IP packets. Drops any fragmented IP packets.
• UDP Flooding. Limits the number of UDP sessions created from one LAN machine.
• TCP Flooding. Protects the VPN firewall from SYN flood attack.
• Enable DNS Proxy. Allows the VPN firewall to handle DNS queries from the LAN.
VPN Firewall and Network Management
"Using Rules to Block or Allow Specific Kinds of Traffic" on page 4-2
v1.0, January 2010
8-5