ZyXEL Communications NXC5200 User Manual page 196

Chapter 11 Interfaces
• IP address - If the DHCP client's MAC address is in the NXC'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.
Table 68 Example: Assigning IP Addresses from a Pool
START IP ADDRESS
50.50.50.33
75.75.75.1
99.99.1.1
120.120.120.100
The NXC 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 NXC cannot assign 50.50.50.0 or 50.50.50.255. If the
subnet mask is 255.255.0.0, the NXC 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.
• Gateway - The interface provides the same gateway you specify for the
interface.
• 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.
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POOL SIZE RANGE OF ASSIGNED IP ADDRESS
5 50.50.50.33 - 50.50.50.37
200 75.75.75.1 - 75.75.75.200
1023 99.99.1.1 - 99.99.4.255
100 120.120.120.100 - 120.120.120.199
NXC5200 User's Guide