D-Link NetDefend DFL-800 Manual de usuario

Configuration examples for the D-Link

NetDefend Firewall series

Scenario: How to configure Transparent Mode in DHCP Network

Environment

Platform Compatibility: All NetDefend Firewall Series

Last update: 2008-03-07

Overview

In this document, the notation Objects->Address book means that in the tree on the left

side of the screen Objects first should be clicked (expanded) and then Address Book.

Most of the examples in this document are adapted for the DFL-800. The same settings can

easily be used for all other models in the series. The only difference is the names of the

interfaces. Since the DFL-1600 and DFL-2500 has more than one lan interface, the lan

interfaces are named lan1, lan2 and lan3 not just lan.

The screenshots in this document is from firmware version 2.11.02. If you are using an

earlier version of the firmware, the screenshots may not be identical to what you see on

your browser.

To prevent existing settings to interfere with the settings in these guides, reset the

firewall to factory defaults before starting.

How to configure Transparent Mode in DHCP network environment

This scenario shows how a firewall in Transparent Mode can be placed into an existing

DHCP network between an Internet access router and LAN, without the need to

reconfigure clients in LAN.

The WAN and LAN interfaces of the firewall will be configured to operate in Transparent

Mode. It is preferred to configure IP addresses on the WAN and LAN interfaces, as this can

improve performance during automatic discovering of hosts.

1. Interfaces.

Go to Objects ->Address book -> InterfaceAddresses:

Edit the following items:

Change lan_ip to 192.168.1.1

Change lannet to 192.168.1.0/24

Change wan1_ip to 192.168.1.101

Change wan1net to 192.168.1.0/24

Add a new IP4 Host/Network object:

Name: gw-world

IP Address: 192.168.1.254

Click OK.

Go to Interfaces -> Ethernet:

Make sure the lan interface has the following settings:

IP Address: lan_ip

Network: lannet

Default Gateway: (None)

Select Enable Transparent Mode checkbox

Click OK.

The settings for the wan1 interface should be:

IP Address: wan1_ip

Network: wan1net

Default Gateway: gw-world

Select Enable Transparent Mode checkbox

Click OK.

Save and activate the configuration.

2. How to configure DHCP relay in transparent mode

Many companies are in DHCP network environment, here will introduce how to configure

your firewall which can allow your DHCP server or ISP DHCP server to offers IP address for

network clients in transparent mode.

Go to Objects ->Address book -> InterfaceAddresses:

Add DHCP server address object

For example:

Name: DHCP_server

IP address: 192.168.1.250

Click OK.

Go to System ->DHCP ->DHCP Relays:

Add DCHP relay:

Name: DHCP

Action:Relay

Source Interface: lan

DHCP Server to relay to: DHCP_server

Allowed IP offers from server: all-nets

Click OK.

Save and Activate

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