Ip Pool Setup - ZyXEL Communications P-3202HN-Ba User Manual

Chapter 7 LAN Setup
configure the IAD as a DHCP server or disable it. When configured as a server, the
IAD 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.

7.1.2.1 IP Pool Setup

The IAD 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.
7.2 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.
• 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 IAD supports the IPCP DNS server
extensions through the DNS proxy feature.
If the DNS Server fields in the DHCP Setup screen are set to DNS Relay, the
IAD tells the DHCP clients that it itself is the DNS server. When a computer
sends a DNS query to the IAD, the IAD acts as a DNS proxy and forwards the
query to the real DNS server learned through IPCP and relays the response back
to the computer.
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.
7.3 LAN TCP/IP
The IAD has built-in DHCP server capability that assigns IP addresses and DNS
servers to systems that support DHCP client capability.
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IAD User's Guide