ZyXEL Communications P-870HW-51a v2 User Manual

 Chapter 6 LAN Setup

P-870HW-51a v2 User’s Guide

The following section contains additional technical information about the ZyXEL 
Device features described in this chapter.

The actual physical connection determines whether the ZyXEL 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 38   LAN and WAN IP Addresses

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 ZyXEL Device as a DHCP server or disable it. When configured as a 
server, the ZyXEL 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. 

The ZyXEL 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.

The ZyXEL Device has built-in DHCP server capability that assigns IP addresses 
and DNS servers to systems that support DHCP client capability.

WAN

LAN