ZyXEL UAG4100 User Guide - Page 497
CNAME Record, Adding a CNAME Record
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Chapter 46 System Figure 333 Configuration > System > DNS > Address/PTR Record Add The following table describes the labels in this screen. Table 236 Configuration > System > DNS > Address/PTR Record Add LABEL FQDN DESCRIPTION Type a Fully-Qualified Domain Name (FQDN) of a server. An FQDN starts with a host name and continues all the way up to the top-level domain name. For example, www.zyxel.com.tw is a fully qualified domain name, where "www" is the host, "zyxel" is the third-level domain, "com" is the second-level domain, and "tw" is the top level domain. Underscores are not allowed. IP Address OK Cancel Use "*." as a prefix in the FQDN for a wildcard domain name (for example, *.example.com). Enter the IP address of the host in dotted decimal notation. Click OK to save your customized settings and exit this screen. Click Cancel to exit this screen without saving 46.6.6 CNAME Record A Canonical Name Record or CNAME record is a type of resource record in the Domain Name System (DNS) that specifies that the domain name is an alias of another, canonical domain name. This allows users to set up a record for a domain name which translates to an IP address, in other words, the domain name is an alias of another. This record also binds all the subdomains to the same IP address without having to create a record for each, so when the IP address is changed, all subdomain's IP address is updated as well, with one edit to the record. For example, the domain name zyxel.com is hooked up to a record named A which translates it to 11.22.33.44. You also have several subdomains, like mail.zyxel.com, ftp.zyxel.com and you want this subdomain to point to your main domain zyxel.com. Edit the IP address in record A and all subdomains will follow automatically. This eliminates chances for errors and increases efficiency in DNS management. 46.6.7 Adding a CNAME Record Click the Add icon in the CNAME Record table to add a record. Use "*." as a prefix for a wildcard domain name. For example *.zyxel.com. UAG Series User's Guide 497