Chapter 10 Interfaces
ZyWALL USG Series User’s Guide
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These fields appear if the Zyxel Device is a DHCP Server.
IP Pool Start
Address
Enter the IP address from which the Zyxel Device 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 Zyxel Device 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 is 10.10.10.10, the Zyxel Device 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 Zyxel Device
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.
Zyxel Device - the DHCP clients use the IP address of this interface and the Zyxel Device
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.
Default Router If you set this interface to DHCP Server, you can select to use either the interface’s IP
address or another IP address as the default router. This default router will become the
DHCP clients’ default gateway.
To use another IP address as the default router, select Custom Defined and enter the IP
address.
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.
Extended
Options
This table is available if you selected DHCP server.
Configure this table if you want to send more information to DHCP clients through DHCP
packets.
Add Click this to create an entry in this table. See Section 10.5.6 on page 329.
Edit Select an entry in this table and click this to modify it.
Remove Select an entry in this table and click this to delete it.
# This field is a sequential value, and it is not associated with any entry.
Name This is the option’s name.
Code This is the option’s code number.
Type This is the option’s type.
Value This is the option’s value.
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.
Table 127 Configuration > Network > Interface > LAG > Add (continued)
LABEL DESCRIPTION
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