ZyXEL NBG6515 User Guide - Page 116
Table 57, Label, Description
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Chapter 15 DHCP Server Table 57 Network > DHCP Server > Advanced (continued) LABEL DNS Servers Assigned by DHCP Server First DNS Server Second DNS Server DESCRIPTION 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. 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. Apply Reset 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. Click Reset to begin configuring this screen afresh. NBG6515 User's Guide 116