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Chapter 37 System
ZyWALL 110/310/1100 Series User’s Guide
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37.6 DNS Overview
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address and
vice versa. The DNS server is extremely important because without it, you must know the IP
address of a machine before you can access it.
37.6.1 DNS Server Address Assignment
The ZyWALL can get the DNS server addresses in the following ways.
• The ISP tells you the DNS server addresses, usually in the form of an information sheet, when
you sign up. If your ISP gives you DNS server addresses, manually enter them in the DNS server
fields.
• If your ISP dynamically assigns the DNS server IP addresses (along with the ZyWALL’s WAN IP
address), set the DNS server fields to get the DNS server address from the ISP.
• You can manually enter the IP addresses of other DNS servers.
37.6.2 Configuring the DNS Screen
Click Configuration > System > DNS to change your ZyWALL’s DNS settings. Use the DNS
screen to configure the ZyWALL to use a DNS server to resolve domain names for ZyWALL system
features like VPN, DDNS and the time server. You can also configure the ZyWALL to accept or
discard DNS queries. Use the Network > Interface screens to configure the DNS server
information that the ZyWALL sends to the specified DHCP client devices.
Figure 298 Configuration > System > DNS