Lan Technical Reference; Lans, Wans And The Zyxel Device; Dhcp Setup; Dns Server Addresses - ZyXEL Communications P-793H v3 User Manual

8.6 LAN Technical Reference

This section provides some technical background information about the topics covered in this
chapter.
8.6.1

LANs, WANs and the ZyXEL Device

The actual physical connection determines whether the P-79X 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 49 LAN and WAN IP Addresses
LAN

8.6.2 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-79X as a DHCP server
or disable it. When configured as a server, the P-79X 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-79X 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.

8.6.3 DNS Server Addresses

DNS (Domain Name System) maps a domain name to its corresponding IP address and vice versa.
The DNS server is extremely important because without it, you must know the IP address of a
computer before you can access it. The DNS server addresses you enter when you set up DHCP are
passed to the client machines along with the assigned IP address and subnet mask.
There are two ways that an ISP disseminates the DNS server addresses.
• The ISP tells you the DNS server addresses, usually in the form of an information sheet, when
you sign up. If your ISP gives you DNS server addresses, enter them in the DNS Server fields in
the DHCP Setup screen.
Chapter 8 LAN Setup
P-79X Series User's Guide
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WAN