Getting Started

36

LAN with a DHCP server

Add a lease to your existing DHCP server to reserve the IP address you chose in

STEP 3

for the CyberGuard SG appliance’s LAN connection.

If you chose to set the CyberGuard SG appliance’s LAN connection settings using

Manual configuration

, you may simply remove this address from the pool of available

addresses.

Enter this same IP address as the gateway IP address to be handed out by the DHCP

server.

Enter this same IP address as the DNS server IP address to be handed out by the DHCP

server.

Restart all the PCs on the network (this will reset their gateway and DNS addresses).

Note

The purpose of restarting the computers is to force them to gain a new DHCP lease.

Alternatively you can use a utility such as

ipconfig

to release then renew a lease, or

disable and re-enable the network connection.

LAN with no DHCP server

A DHCP server allows PCs to automatically obtain network settings when they start up.

If your network does not have a DHCP server, you may either manually set up each PC

on your network, or

set up the CyberGuard SG appliance's DHCP server.

Note

If you only have several PCs, we suggest manually setting up your network.

If you have

more PCs, enabling the CyberGuard SG appliance’s DHCP server is more scalable.

Getting Started

37

To manually set up each Windows PC on your network:

Click

Start

->

Settings

->

Control Panel

and double click

Network

Connections

(or in 95/98/Me, double click

Network

).

If presented with multiple connections, right click on

Local Area Connection

(or

appropriate network connection) and select

Properties

.

Select

Internet Protocol (TCP/IP)

and click

Properties

(or in 95/98/Me,

TCP/IP

->

[your network card name]

if there are multiple entries).

Enter the following details:

IP address

is an IP address that is part of the same subnet range as the

CyberGuard SG appliance’s LAN connection (e.g. if using the default settings,

192.168.0.2 – 192.168.0.254).

•

Subnet mask

is the subnet mask of the CyberGuard SG appliance’s LAN

connection.

•

Default gateway

is the IP address of the CyberGuard SG appliance’s

LAN connection.

•

Preferred DNS server

is the IP address of the CyberGuard SG

appliance’s LAN connection.

Click

OK

(or in 95/98/Me,

Add

then

OK

, reboot the PC if prompted to do so).

Perform these steps for each PC on your network.

You are now finished.

Getting Started

38

Alternatively, to activate your CyberGuard SG appliance's DHCP server:

Launch Internet Explorer (or your preferred web browser) and navigate to the IP

address of the CyberGuard SG appliance’s LAN connection.

The Web Management Console will display.

Select

DHCP Server

from the

Networking

menu.

Click

Add Server

and configure the DHCP server with the following details:

•

Gateway Address

is the IP address of the CyberGuard SG appliance’s

LAN connection, or leave it blank.

•

DNS Address

is the IP address of the CyberGuard SG appliance’s LAN

connection, or leave it blank.

•

WINS Address

(optional) is the IP address of any existing WINS server

on your LAN.

•

Default Lease Time and Maximum Lease Time

should generally be left

at their default values.

•

Initial Dynamic IP Address Range

is a range of free IP addresses on

your LAN’s subnet for the CyberGuard SG appliance to hand out to PCs

on your LAN.

Note

For a detailed description of configuring DHCP Server Settings, please refer to

the User Manual.

Each PC on your LAN must now be set up to use DHCP.

For each PC on your

LAN:

Click

Start

->

Settings

->

Control Panel

and double click

Network

Connections

(or in 95/98/Me, double click

Network

).

If presented with multiple connections, right click on

Local Area Connection

(or

appropriate network connection) and select

Properties

.

Getting Started

39

Select

Internet Protocol (TCP/IP)

and click

Properties

(or in 95/98/Me,

TCP/IP

->

[your network card name]

if there are multiple entries) and click

Properties

(in 95/98/Me, you may also have to click the

IP Address

tab).

Figure 2-12

Check

Obtain an IP address automatically

, check

Obtain DNS server address

automatically

and click

OK

(in 95/98/Me, reboot the PC if prompted to do so).

You are now finished.

Getting Started

40

CyberGuard SG PCI Appliances

Install your CyberGuard SG Appliance in a Spare PCI Slot

Power off your PC and remove its cover.

Select an unused PCI slot and insert the

CyberGuard SG appliance, then power on your PC.

Install the Network Driver on your PC

The CyberGuard SG appliance will be automatically detected and have the appropriate

driver installed when Windows starts up.

It will be detected as a Realtek RTL8139-series

Fast Ethernet Adapter.

Note

You can check that a new network adapter has been installed under Windows 2000/XP

by clicking

Start

,

Settings

,

Network and Dialup Connections

,

Local Area Connection

(possibly followed by a number),

Properties

and ensure the adapter is listed in the

Connect using

field.

Set up your PC to Connect to the Web Management Console

Note

The following steps assume you want to set up the CyberGuard SG appliance in

bridged

mode

, so that it sits between your PC and the LAN transparently filtering network traffic.

If you want to set up the CyberGuard SG appliance for

NAT mode

or to connect directly

to your ISP, refer to the chapter entitled

Network Connections

.

The CyberGuard SG appliance ships with initial, static IP settings of:

IP address:

192.168.0.1

Subnet mask:

255.255.255.0

Your CyberGuard SG appliance will to have its network settings set appropriately for your

LAN before it is connected.