ZyXEL Communications P-870HW-I User Manual
P-870HW-I1 User’s Guide
Chapter 9 DHCP Server
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H A P T E R
9
DHCP Server
This chapter describes how to configure the DHCP server for the LAN and WLAN ports.
9.1 DHCP Overview
Dynamic Host Configuration Protocol (DHCP, RFC 2131, RFC 2132) provides a way to
automatically set up and maintain IP addresses, subnet masks, gateways, and some network
information (such as the IP addresses of DNS servers) on computers in the network. This
reduces the amount of manual configuration you have to do and usually uses available IP
addresses more efficiently.
automatically set up and maintain IP addresses, subnet masks, gateways, and some network
information (such as the IP addresses of DNS servers) on computers in the network. This
reduces the amount of manual configuration you have to do and usually uses available IP
addresses more efficiently.
In DHCP, every network has at least one DHCP server. When a computer (a DHCP client)
joins the network, it submits a DHCP request. The DHCP servers get the request; assign an IP
address; and provide the IP address, subnet mask, gateway, and available network information
to the DHCP client. When the DHCP client leaves the network, the DHCP servers can assign
its IP address to another DHCP client.
joins the network, it submits a DHCP request. The DHCP servers get the request; assign an IP
address; and provide the IP address, subnet mask, gateway, and available network information
to the DHCP client. When the DHCP client leaves the network, the DHCP servers can assign
its IP address to another DHCP client.
The ZyXEL Device can be a DHCP server.
1
In this case, it provides the following information
to DHCP clients.
• IP address - If the DHCP client’s MAC address is in the ZyXEL Device’s static DHCP
table, the ZyXEL Device assigns the corresponding IP address. If not, the ZyXEL Device
assigns IP addresses from a pool, defined by the starting address of the pool and the pool
size.
assigns IP addresses from a pool, defined by the starting address of the pool and the pool
size.
• Subnet mask - The ZyXEL Device provides the same subnet mask you specify for the
LAN port. See Network > LAN > IP.
• Gateway - The gateway is the ZyXEL Device, so it provides the IP address you specify
for you specify for the LAN port. See Network > LAN > IP.
1.
At the time of writing, the DHCP server is turned on by default.
Table 54 Example: Assigning IP Addresses from a Pool
START IP ADDRESS
POOL SIZE
RANGE OF ASSIGNED IP ADDRESS
50.50.50.33
5
50.50.50.33 - 50.50.50.37
75.75.75.1
200
75.75.75.1 - 75.75.75.200
120.120.120.100
100
120.120.120.100 - 120.120.120.199