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AM-DF-SD

Sub-domains

This screen lets you set up sub-domains for your main domain name. Sub-domains can be very useful in combination with the dynamic DNS feature that DTC provides.

Sub-domains can be useful if you have different sets of content on your web site that you want to break up. For example, you might set up a web site for private company information with a password and then use the sub-domain intranet.example.com.

Sub-domains, in combination with the dynamic DNS feature can also be very useful for setting up a domain name for remote support of your users computers. For example, if you have remote users with dynamic ip addresses from their broadband provider then you can use sub-domains to identify their machines.

Sub-domain features:

  • Default subdomain – this feature less you set which domain will be used by default if the user does not specify a subdomain when using their web browser. Eg. If the user enters example.com without the www then their browser will automatically view www.example.com
  • Use as wildcard for the domain – Adds a wildcard DNS record in the DNS zone that will match requests for non-existent domain names. eg. If someone types ww.example.com by mistake then the DNS will automatically send them to www.exmaple.com. You can define which sub-domain is used as the automatic default using this feature (usually www).
  • List of your sub-domains – by default DTC gives account holders 5 domains. More can be requested from your provider if required.
  • Create a subdomain – this part of the screen lets you set up a new subdomain.
    • Subdomain name – you can call your subdomain what ever you want as long as the name follows the rules for domain names.
    • IP address or CNAME – you can specify a different computer for each sub-domain. The other computer can be specified by either using its IP address or another domain (or subdomain) name ie – CNAME. If the sub-domain is to exist on your hosting server then you can just leave this field blank.
    • Generate a vhost entry for this subdomain – This feature tells DTC to create a vhost entry in the apache web server configuration file on this server. If you have specified a different IP address or CNAME then you would not want to create a vhost entry.
    • AddDefaultCharset – This feature lets you set a default character set to be used by content in this sub-domain. It adds a AddDefaultCharset directive in to the vhost file in the web server with the value that you select here.
    • This subdomain is a service (SRV) entry for the following port – This feature lets you set a port number for a service that is pointing at this sub-domain. The port number is included in the DNS zone file so that the service port can be customised. This allows you to define non-standard port numbers for a service associated with the sub-domain.
    • Use register_globals=1 – Enable register_globals for this domain in the virtual host file on the web server.
    Note: Some older web applications written in PHP won't work unless register globals is turned on. This feature lets you turn it on selectively for just your sub-domain.
    • Txt field for the subdomain – Free form text field that can be used to add additional information to the dns record that will be seen by anyone using the dig tool on the domain.
    • Dynamic IP update login – Use this field to specify a login name for your dynamic DNS client to use to update the DNS server with the correct IP address. This prevents people from spoofing your sub-domain name.
    • Dynamic IP update password – Use this field to specify the password for the user name for updating the DNS server.
    • - This button generates a random password for you.
    • - This button will cause the password field to display the password in plain text rather than *****. This feature is useful when editing a sub-domain if you have forgotten what password you set when you originally created the record.
    • - This button will save changes to the record you’re working on.
Page last modified on July 16, 2010, at 05:20 AM EST