There are a number of situations where it would be useful for a domain to answer to two different IP addresses at the same time. For example
- When renumbering a (GMS or GMS Webmail ) server to a new IP address range. In this case, responding to both the Primary and Alias IP addresses for a couple of weeks would cover the time needed for the DNS changes to be propagated.
- Providing redundant routing for TCP/IP packets. In this case, the MX records for the messaging server will have two records, one for each route to the server. The server must respond to connections from two, completely different IP addresses.
This can be done by adding the IP Address as a domain alias. Open the GMS or GMS Webmail Admin Configuration Interface, go to the DOMAINS section, select the domain you wish to add the IP address to and click on the “Aliases” tab. Enter the IP address as the alias and press “Add” and then “Update” for the change to be registered.
Your domain will now respond to its primary IP and the domain alias IP address.
Keywords:domain, IP, address, single, respond