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Introduction
The DFL-500 Network Protection Gateway (NPG) is an easy-to-deploy and easy-to-administer solution that
delivers exceptional value and performance for small
office and home office (SOHO) applications.
Your DFL-500 is a dedicated easily managed security
device that delivers a full suite of capabilities that
include firewall, VPN, traffic shaping, and web content
filtering.
NAT/Route mode and Transparent
mode
The DFL-500 can operate in NAT/Route mode or Transparent mode.
NAT/Route mode
In NAT/Route mode, the DFL-500 is installed as a privacy barrier between the internal network and the
Internet. The firewall provides network address translation (NAT) to protect the internal private network. You
can control whether firewall policies run in NAT mode or route mode. NAT mode policies route allowed
connections between firewall interfaces, performing network address translation to hide addresses on the
protected internal networks. Route mode policies route allowed connections between firewall interfaces
without performing network address translation.
Transparent mode
Transparent Mode provides firewall protection to a pre-existing network with public addresses. The internal
and external network interfaces of the DFL-500 NPG must be in the same subnet and the DFL-500 NPG can
be inserted into your network at any point without the need to make any changes to your network.
About this document
This user manual describes how to install and configure the DFL-500 NPG. This document contains the
following information:
•
Getting started
•
NAT/Route mode installation
running it in NAT/Route mode.
•
Transparent mode installation
running it in Transparent mode.
•
Firewall configuration
•
IPSec VPNs
describes how to configure DFL-500 IPSec VPN.
•
PPTP and L2TP VPNs
and a Windows client.
•
Web content filtering
from passing through the DFL-500 NPG.
•
Logging and reporting
DFL-500 NPG.
DFL-500 User Manual
describes unpacking, mounting, and powering on the DFL-500 NPG.
describes how to install the DFL-500 NPG if you are planning on
describes how to install the DFL-500 NPG if you are planning on
describes how to configure firewall policies to enhance firewall protection.
describes how to configure PPTP and L2TP VPNs between the DFL-500 NPG
describes how to configure web content filters to prevent unwanted web content
describes how to configure logging and reporting to track activity through the
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