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OfficeConnect VPN Firewall User’s Manual Chapter 5. Configuring LAN Settings

The DHCP server draws from a defined pool of IP addresses and ―leases‖ them

for a specified amount of time to your computers when they request an Internet

session. It monitors, collects, and redistributes the addresses as needed.

On a DHCP-enabled network, the IP information is assigned dynamically rather

than statically. A DHCP client can be assigned a different address from the pool

each time it reconnects to the network.

5.2.2 Why use DHCP?

DHCP allows you to manage and distribute IP addresses throughout your

network from the OfficeConnect Gigabit VPN Firewall. Without DHCP, you would

have to configure each computer separately with IP address and related

information. DHCP is commonly used with large networks and those that are

frequently expanded or otherwise updated.

5.2.3 Configuring DHCP Server

Note

By default, the OfficeConnect Gigabit VPN Firewall is configured

as a DHCP server on the LAN side, with a predefined IP address

pool of 192.168.1.10 through 192.168.1.42 (subnet mask

255.255.255.0). To change this range of addresses, follow the

procedures described in this section.

First, you must configure your PCs to accept DHCP information assigned by a

DHCP server:

1. Log into Configuration Manager as administrator, click the LAN

menu, and then click the DHCP submenu. The DHCP Configuration

page displays as shown in Figure 5.3:

Figure 5.3 DHCP Configuration Page

2. Enter the information for the IP Address Pool (Begin/End Address),

Subnet Mask, Lease Time and Default Gateway IP Address, fields;

others, such as Primary/Secondary DNS Server IP Address and

Primary/Secondary WINS Server IP Address are optional. However,

it is recommended that you enter the primary DNS server IP address

in the space provided. You may enter the LAN IP or your ISP’s DNS

IP in the primary DNS Server IP Address field. Table 5.2 describes

the DHCP configuration parameters in detail.

Table 5.2 DHCP Configuration Parameters

Field

Description

IP Address Pool Begin/End

Specify the lowest and highest

addresses in the DHCP address pool.

Subnet Mask

Enter the subnet mask to be used for the

DHCP address pool.

Lease Time

The amount of time the assigned

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HP OfficeConnect Firewall Series Manuel d'utilisateur Page 41

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