ZyWALL 5/35/70 Series User’s Guide

26.4 Address Record

An address record contains the mapping of a fully qualified domain name (FQDN) to an IP address. An FQDN consists of a host and domain name and includes the top-level domain. For example, www.zyxel.com.tw is a fully qualified domain name, where “www” is the host, “zyxel” is the second-level domain, and “com.tw” is the top level domain. mail.myZyXEL.com.tw is also a FQDN, where "mail" is the host, "myZyXEL" is the second- level domain, and "com.tw" is the top level domain.

The ZyWALL allows you to configure address records about the ZyWALL itself or another device. This way you can keep a record of DNS names and addresses that people on your network may use frequently. If the ZyWALL receives a DNS query for an FQDN for which the ZyWALL has an address record, the ZyWALL can send the IP address in a DNS response without having to query a DNS name server.

26.4.1 DNS Wildcard

Enabling the wildcard feature for your host causes *.yourhost.com to be aliased to the same IP address as yourhost.com. This feature is useful if you want to be able to use, for example, www.yourhost.com and still reach your hostname.

26.5 Name Server Record

A name server record contains a DNS server’s IP address. The ZyWALL can query the DNS server to resolve domain names for features like VPN, DDNS and the time server. A domain zone may also be included. A domain zone is a fully qualified domain name without the host. For example, zyxel.com.tw is the domain zone for the www.zyxel.com.tw fully qualified domain name.

26.5.1 Private DNS Server

In cases where you want to use domain names to access Intranet servers on a remote private network that has a DNS server, you must identify that DNS server. You cannot use DNS servers on the LAN or from the ISP since these DNS servers cannot resolve domain names to private IP addresses on the remote private network.

The following figure depicts an example where three VPN tunnels are created from ZyWALL A; one to branch office 2, one to branch office 3 and another to headquarters (HQ). In order to access computers that use private domain names on the HQ network, the ZyWALL at branch office 1 uses the Intranet DNS server in headquarters.

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Chapter 26 DNS