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Prestige 100 and 100IH ISDN Router and Router/Hub
Internet Access 3-3
IP Pool Setup
The Prestige is pre-configured with a pool of 32 IP addresses starting from 192.168.1.33 to
192.168.1.64 for the client machines. This leaves 31 IP addresses, 192.168.1.2 to 192.168.1.32
(excluding the Prestige itself which has a default IP of 192.168.1.1) for other server machines,
e.g., server for mail, FTP, telnet, web, etc., that you may have.
DNS Server Address
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address
and vice versa, e.g., the IP address of www.zyxel.com is 204.217.0.2. The DNS server is
extremely important because without it, you must know the IP address of a machine before you
can access it. The DNS server addresses that you enter in the DHCP setup 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 first is for an ISP
to tell a customer the DNS server addresses, usually in the form of an information sheet, when
you sign up. If your ISP does give you the DNS server addresses, enter them in the DNS
Server fields in DHCP Setup.
Some ISP’s choose to pass the DNS servers using the DNS server extensions of PPP 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 Prestige supports the
IPCP DNS server extensions through the DNS proxy feature.
If the Primary and Secondary DNS Server fields in DHCP Setup are not specified, i.e., left as
0.0.0.0, the Prestige tells the DHCP clients that it itself is the DNS server. When a workstation
sends a DNS query to the Prestige, the Prestige forwards the query to the real DNS server
learned through IPCP and relays the response back to the workstation.
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 menu. This way, the Prestige can pass the DNS servers to the workstations and
the workstations can query the DNS server directly without the Prestige’s intervention.