ZyXEL Communications P-870HN-5xb User Manual page 111

Chapter 6 LAN Setup
LANs, WANs and the ZyXEL Device
The actual physical connection determines whether the Device ports are LAN or
WAN ports. There are two separate IP networks, one inside the LAN network and
the other outside the WAN network as shown next.
Figure 50 LAN and WAN IP Addresses
LAN
WAN
Internet
DHCP Setup
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows
individual clients to obtain TCP/IP configuration at start-up from a server. You can
configure the Device as a DHCP server or disable it. When configured as a server,
the Device provides the TCP/IP configuration for the clients. If you turn DHCP
service off, you must have another DHCP server on your LAN, or else the
computer must be manually configured.
IP Pool Setup
The Device is pre-configured with a pool of IP addresses for the DHCP clients
(DHCP Pool). See the product specifications in the appendices. Do not assign static
IP addresses from the DHCP pool to your LAN computers.
LAN TCP/IP
The Device has built-in DHCP server capability that assigns IP addresses and DNS
servers to systems that support DHCP client capability.
IP Address and Subnet Mask
Similar to the way houses on a street share a common street name, so too do
computers on a LAN share one common network number.
Where you obtain your network number depends on your particular situation. If
the ISP or your network administrator assigns you a block of registered IP
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P-870HN-5xb User's Guide