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Chapter 7 Interfaces

ZyWALL 110/310/1100 Series User’s Guide

174

In the ZyWALL, some interfaces can provide DHCP services to the network. In this case, the
interface can be a DHCP relay or a DHCP server.

As a DHCP relay, the interface routes DHCP requests to DHCP servers on different networks. You
can specify more than one DHCP server. If you do, the interface routes DHCP requests to all of
them. It is possible for an interface to be a DHCP relay and a DHCP client simultaneously.

As a DHCP server, the interface provides the following information to DHCP clients.

• IP address - If the DHCP client’s MAC address is in the ZyWALL’s static DHCP table, the interface

assigns the corresponding IP address. If not, the interface assigns IP addresses from a pool,
defined by the starting address of the pool and the pool size.

The ZyWALL cannot assign the first address (network address) or the last address (broadcast
address) in the subnet defined by the interface’s IP address and subnet mask. For example, in
the first entry, if the subnet mask is 255.255.255.0, the ZyWALL cannot assign 50.50.50.0 or
50.50.50.255. If the subnet mask is 255.255.0.0, the ZyWALL cannot assign 50.50.0.0 or
50.50.255.255. Otherwise, it can assign every IP address in the range, except the interface’s IP
address.
If you do not specify the starting address or the pool size, the interface the maximum range of IP
addresses allowed by the interface’s IP address and subnet mask. For example, if the interface’s
IP address is 9.9.9.1 and subnet mask is 255.255.255.0, the starting IP address in the pool is
9.9.9.2, and the pool size is 253.

• Subnet mask - The interface provides the same subnet mask you specify for the interface. See

Address Assignment on page 172

• Gateway - The interface provides the same gateway you specify for the interface. See

IP Address

Assignment on page 172

• DNS servers - The interface provides IP addresses for up to three DNS servers that provide DNS

services for DHCP clients. You can specify each IP address manually (for example, a company’s
own DNS server), or you can refer to DNS servers that other interfaces received from DHCP
servers (for example, a DNS server at an ISP). These other interfaces have to be DHCP clients.

It is not possible for an interface to be the DHCP server and a DHCP client simultaneously.

WINS

WINS (Windows Internet Naming Service) is a Windows implementation of NetBIOS Name Server
(NBNS) on Windows. It keeps track of NetBIOS computer names. It stores a mapping table of your
network’s computer names and IP addresses. The table is dynamically updated for IP addresses
assigned by DHCP. This helps reduce broadcast traffic since computers can query the server instead
of broadcasting a request for a computer name’s IP address. In this way WINS is similar to DNS,
although WINS does not use a hierarchy (unlike DNS). A network can have more than one WINS
server. Samba can also serve as a WINS server.

Table 62

Example: Assigning IP Addresses from a Pool

START IP ADDRESS

POOL SIZE

RANGE OF ASSIGNED IP ADDRESS

50.50.50.33

50.50.50.33 - 50.50.50.37

75.75.75.1

200

75.75.75.1 - 75.75.75.200

99.99.1.1

1023