ZyXEL Communications ZyWall USG20-VPN User Manual page 200

Table 76 Configuration > Network > Interface > VLAN > Add / Edit (continued)
LABEL DESCRIPTION
These fields appear if the USG is a DHCP Server.
IP Pool Start Enter the IP address from which the USG begins allocating IP addresses. If you want to
Address
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 USG 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 USG 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
USG 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 Specify the IP addresses up to three DNS servers for the DHCP clients to use. Use one
Second DNS
of the following ways to specify these IP addresses.
Server
Third DNS
Custom Defined - enter a static IP address.
Server
From ISP - select the DNS server that another interface received from its DHCP server.
USG - the DHCP clients use the IP address of this interface and the USG works as a
DNS relay.
First WINS Type the IP address of the WINS (Windows Internet Naming Service) server that you
Server, Second
want to send to the DHCP clients. The WINS server keeps a mapping table of the
WINS Server
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 This table is available if you selected DHCP server.
Options
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
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.
Chapter 9 Interfaces
USG20(W)-VPN Series User's Guide
200
Section 9.3.4 on page 166.