Quick Reference Guide

ProSafe VPN Firewall 50 FVS338 Reference Manual
VPN Firewall and Network Management 6-5
v1.0, January 2010
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 this
firewall is 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.
• Enable Stealth Mode. Prevents the VPN firewall from responding to incoming requests for
unsupported services.
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.
– Any. The rule applies to all Internet IP address.
– Single address. The rule applies to a single Internet IP address.
– Address range. The rule is applied to a range of Internet IP addresses.
• Destination Address. These settings determine the destination IP address for this rule which
will be applicable to incoming traffic, this rule will be applied only when the destination IP
address of the incoming packet matches the IP address of the WAN interface selected or
Specific IP address entered in this field. Selecting ANY enables the rule for any IP in the
destination field.