ZyXEL Communications ZyWall USG 50-H Series, User Manual

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Chapter 8 Interface
ZyWALL USG 50-H User’s Guide
204
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 is 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 of a maximum of three DNS servers that the network
can use. The ZyWALL provides these IP addresses to DHCP clients. 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 ZyWALL uses the IP address of this interface and 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.
Edit static DHCP
table Click this if you want the ZyWALL to assign static IP addresses to computers.
The
Static DHCP screen appears.
Figure 158 Network > Interface > Ethernet > Edit > Edit static DHCP
table
The ZyWALL checks this table when it assigns IP addresses. If the computer’s
MAC address is in the table, the ZyWALL assigns the corresponding IP
address. Otherwise, the ZyWALL assigns the IP address dynamically using the
IP Pool Start Address and Pool Size .
Note: You must click OK in the Static DHCP screen and then
click OK in this screen to save your changes.
OK Click OK to save your changes back to the ZyWALL.
Cancel Click Cancel to exit this screen without saving.
Table 68 Network > Interface > VLAN > Edit (continued)
LABEL DESCRIPTION