ZyXEL Communications NBG4615 User Manual page 170

Chapter 19 DHCP Server
Table 67 Network > DHCP Server > Advanced (continued)
LABEL
First DNS Server
Second DNS Server
Apply
Cancel
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DESCRIPTION
Select From ISP if your ISP dynamically assigns DNS server information (and
the NBG4615'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 NBG4615 act as a DNS proxy. The NBG4615's
LAN IP address displays in the field to the right (read-only). The NBG4615 tells
the DHCP clients on the LAN that the NBG4615 itself is the DNS server. When a
computer on the LAN sends a DNS query to the NBG4615, the NBG4615
forwards the query to the NBG4615'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 NBG4615.
Click Cancel to begin configuring this screen afresh.
NBG4615 User's Guide