After moving my site to WebHosting, why does a DNS record still point to metro?

This FAQ was last modified on: Tuesday, February 16, 2016 04:02pm
If your domain is used to send or receive e-mail or if it is a DNS zone, it cannot be directly associated with webHosting.
In this situation, an HTTP redirect will be required to ensure that requests for your domain go to a DNS address associated with the webHosting server. This redirect is hosted on metro which is why the DNS record for your domain still points there. This is not an optimal solution and OIT is working on allowing these domains to point to webHosting. Until that is set up, the metro redirect will remain in place.
From a technical standpoint, a domain that sends or receives e-mail has MX records associated with it and a domain that is a DNS zone has at least a SOA record associated with it. In order to keep the e-mail and/or DNS zone functionality, the domain cannot be a DNS cname because a cname overrides all other records (including MX and SOA records) associated with a domain. These domains must be A records. 
Because webHosting is not set up as a single box (it is two machines... a primary and a DR fail-over), pointing DNS A records to's IP ( would be ineffective in the case where OIT has to switch to the back-up webHosting machine.
Any DNS entries for sites on webHosting that are cnames should be cnames to, whose DNS is (eventually) served via GTM, and thus can be changed quickly, easily, and globally (for all sites on webHosting) in case of emergency.
Any DNS entries for sites on webHosting that must be A records (for reasons explained above), should point to one of metro's IP addresses, where a host entry will redirect the request to a cname pointed to webHosting. 

For example, cannot be a cname because it has MX records. It must be an A record, and in this case, to metro's php5 interface:
# host has address mail is handled by 10 mail is handled by 10 mail is handled by 10 mail is handled by 10 mail is handled by 10


# host is an alias for is an alias for has address



Requests for are sent to (the php5 interface of metro) where they are redirected to which is on webHosting.