Dhcp Setup; Dns Server Addresses - ZyXEL Communications PMG2006-T20A User Manual

Gpon hgu with 4-port gbe switch

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Figure 28 LAN and WAN IP Addresses

7.7.2 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 PMG2006-T20A as a DHCP server or

disable it. When configured as a server, the PMG2006-T20A 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 PMG2006-T20A 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.

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.

• Some ISPs choose to disseminate the DNS server addresses using the DNS server extensions of IPCP (IP

Control Protocol) after the connection is up. If your ISP did not give you explicit DNS servers, chances

are the DNS servers are conveyed through IPCP negotiation. The PMG2006-T20A supports the IPCP

DNS server extensions through the DNS proxy feature.

Please note that DNS proxy works only when the ISP uses the IPCP DNS server extensions. It does not

mean you can leave the DNS servers out of the DHCP setup under all circumstances. If your ISP gives

you explicit DNS servers, make sure that you enter their IP addresses in the DHCP Setup screen.

Chapter 7 Home Networking

PMG2006-T20A User's Guide

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