LANs, WANs and the ZyXEL Device
The actual physical connection determines whether the P-2812HNU-51c 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 58 LAN and WAN IP Addresses
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 P-2812HNU-51c as a DHCP server or disable it. When configured as
aserver, the P-2812HNU-51c 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 P-2812HNU-51c 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 P-2812HNU-51c 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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