ZyWALL 5/35/70 Series User’s Guide
CH A P T E R 26
DNS
This chapter shows you how to configure the DNS screens.
26.1 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. The ZyWALL uses a system DNS server (in the order you specify in the DNS System screen) to resolve domain names, for example, VPN, DDNS and the time server.
26.2 DNS Server Address Assignment
The ZyWALL can get the DNS server addresses in the following ways.
1The 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.
2If 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.
3You can manually enter the IP addresses of other DNS servers. These servers can be public or private. A DNS server could even be behind a remote IPSec router (see Section 26.5.1 on page 415).
26.3DNS Servers
There are three places where you can configure DNS setup on the ZyWALL.
1Use the DNS System 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.
2Use the DNS DHCP screen to configure the DNS server information that the ZyWALL sends to the DHCP client devices on the LAN, DMZ or WLAN.
3Use the REMOTE MGMT DNS screen to configure the ZyWALL (in router mode) to accept or discard DNS queries.
Chapter 26 DNS | 414 |