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ProSecure Unified Threat Management (UTM) Appliance
• Local computers need to access the local server using the computers’ local LAN address.
Attempts by local computers to access the server using the external WAN IP address will
fail.
Note: See Configure Port Triggering on page 183 for yet another way to
allow certain types of inbound traffic that would otherwise be blocked
by the firewall.
Note: The UTM always blocks denial of service (DoS) attacks. A DoS
attack does not attempt to steal data or damage your computers, but
overloads your Internet connection so you cannot use it (that is, the
service becomes unavailable).
Note: When the Block TCP Flood and Block UDP Flood check boxes are
selected on the Attack Checks screen (see Attack Checks, VPN
Pass-through, and Multicast Pass-through on page 157), multiple
concurrent connections of the same application from one host or IP
address (such as multiple DNS queries from one computer) trigger
the UTM’s DoS protection.
Note: For more information about protecting the UTM from incoming
threats, see Enable and Configure the Intrusion Prevention System
on page 187.
The following table describes the fields that define the rules for inbound traffic and that are
common to most Inbound Service screens (see Figure 69 on page 142, Figure 72 on
page 145, and Figure 75 on page 148).
The steps to configure inbound rules are described in the following sections:
• Configure LAN WAN Rules
• Configure DMZ WAN Rules
• Configure LAN DMZ Rules