ZyXEL Communications NBG-419N User Manual page 123

Table 57 Network > DHCP Server > Advanced
LABEL
DNS Server
DNS Servers
Assigned by DHCP
Server
First DNS Server
Second DNS Server
Apply
Reset
NBG-419N User's Guide
DESCRIPTION
The NBG-419N passes a DNS (Domain Name System) server IP address (in the
order you specify here) to the DHCP clients. The NBG-419N only passes this
information to the LAN DHCP clients when you select the Enable DHCP Server
check box. When you clear the Enable DHCP Server check box, DHCP service
is disabled and you must have another DHCP sever on your LAN, or else the
computers must have their DNS server addresses manually configured.
Select From ISP if your ISP dynamically assigns DNS server information (and
the NBG-419N's WAN IP address). The field to the right displays the (read-
only) DNS server IP address that the ISP assigns.
Select User-Defined if you have the IP address of a DNS server. Enter the
DNS server's IP address in the field to the right. If you chose User-Defined,
but leave the IP address set to 0.0.0.0, User-Defined changes to None after
you click Apply. If you set a second choice to User-Defined, and enter the
same IP address, the second User-Defined changes to None after you click
Apply.
Select DNS Relay to have the NBG-419N act as a DNS proxy. The NBG-419N's
LAN IP address displays in the field to the right (read-only). The NBG-419N
tells the DHCP clients on the LAN that the NBG-419N itself is the DNS server.
When a computer on the LAN sends a DNS query to the NBG-419N, the NBG-
419N forwards the query to the NBG-419N's system DNS server (configured in
the WAN > Internet Connection screen) and relays the response back to the
computer. You can only select DNS Relay for one of the three servers; if you
select DNS Relay for a second or third DNS server, that choice changes to
None after you click Apply.
Select None if you do not want to configure DNS servers. If you do not
configure a DNS server, you must know the IP address of a computer in order
to access it.
Click Apply to save your changes back to the NBG-419N.
Click Reset to begin configuring this screen afresh.
Chapter 14 DHCP Server
123