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Chapter 15 DHCP Server
NBG6515 User’s Guide
116
DNS Servers
Assigned by
DHCP Server
The NBG passes a DNS (Domain Name System) server IP address (in the order you specify
here) to the DHCP clients. The NBG 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.
First DNS
Server
Second DNS
Server
Select From ISP if your ISP dynamically assigns DNS server information (and the NBG'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 act as a DNS proxy. The NBG's LAN IP address displays
in the field to the right (read-only). The NBG tells the DHCP clients on the LAN that the NBG
itself is the DNS server. When a computer on the LAN sends a DNS query to the NBG, the
NBG forwards the query to the NBG'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.
Apply Click Apply to save your changes back to the NBG.
Reset Click Reset to begin configuring this screen afresh.
Table 57 Network > DHCP Server > Advanced (continued)
LABEL DESCRIPTION