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Prestige 128IMH ISDN Modem/ Router/Hub
3-4 Internet 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 s/he
signs 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.