So I'm not especially happy with my current webhost with whom we have scores of webservers with a managed hardware setup and no control over IP assignment.
Since I won't be able to take out a new supplier and reassign the IPs, I was wondering about the following scenario.
What if rather than pointing my domains to the 'A' records, I set up a bunch of domains e.g. 12-34-56-78.mydomain.com pointing at the infrastructure IPs and then CNAMEd all domains to the relevant IP?
That way I can migrate sites to a new supplier by lowering the TTL on 12-34-56-78.mydomain.com and repointing it to the new supplier.
Will this work? Will I hit problems?