ZyXEL Communications ZyWALL USG 100 Series Manual Download

Page: 361 / 1157

Chapter 13 Interfaces

ZyWALL USG 100/200 Series User’s Guide

361

IP Pool Start

Address

Enter the IP address from which the ZyWALL begins allocating IP
addresses. If you want to assign a static IP address to a specific
computer, click

Add Static DHCP

If this field is blank, the

Pool Size

must also be blank. In this case,

the ZyWALL can assign every IP address allowed by the interface’s IP
address and subnet mask, except for the first address (network
address), last address (broadcast address) and the interface’s IP
address.

Pool Size

Enter the number of IP addresses to allocate. This number must be at
least one and is limited by the interface’s

Subnet Mask

. For example,

if the

Subnet Mask

is 255.255.255.0 and

IP Pool Start Address

10.10.10.10, the ZyWALL can allocate 10.10.10.10 to 10.10.10.254,
or 245 IP addresses.

If this field is blank, the

IP Pool Start Address

must also be blank.

In this case, the ZyWALL can assign every IP address allowed by the
interface’s IP address and subnet mask, except for the first address
(network address), last address (broadcast address) and the
interface’s IP address.

First DNS

Server

Second DNS

Server

Third DNS

Server

Specify the IP addresses up to three DNS servers for the DHCP clients
to use. Use one of the following ways to specify these IP addresses.

Custom Defined

- enter a static IP address.

From ISP

- select the DNS server that another interface received

from its DHCP server.

ZyWALL

- the DHCP clients use the IP address of this interface and

the ZyWALL works as a DNS relay.

First WINS

Server, Second

WINS Server

Type the IP address of the WINS (Windows Internet Naming Service)
server that you want to send to the DHCP clients. The WINS server
keeps a mapping table of the computer names on your network and
the IP addresses that they are currently using.

Lease time

Specify how long each computer can use the information (especially
the IP address) before it has to request the information again.
Choices are:

infinite

- select this if IP addresses never expire

days, hours, and minutes

- select this to enter how long IP

addresses are valid.

Enable IP/MAC

Binding

Select this option to have this interface enforce links between specific
IP addresses and specific MAC addresses. This stops anyone else from
manually using a bound IP address on another device connected to
this interface. Use this to make use only the intended users get to use
specific IP addresses.

Enable Logs

for IP/MAC

Binding

Violation

Select this option to have the ZyWALL generate a log if a device
connected to this interface attempts to use an IP address that is
bound to another device’s MAC address.

Static DHCP

Table

Configure a list of static IP addresses the ZyWALL assigns to
computers connected to the interface. Otherwise, the ZyWALL assigns
an IP address dynamically using the interface’s

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