ZyXEL NBG4615 User Guide - Page 170
Table 68, Label, Description
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Chapter 19 DHCP Server Table 68 Network > DHCP Server > Advanced (continued) LABEL First DNS Server Second DNS Server 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. Apply Cancel 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. 170 NBG4615 User's Guide