In article <glmqqb$jv...@sf1.isc.org>, mlel...@serpens.de (Michael van Elst) wrote:
> Barry Margolin <bar...@alum.mit.edu> writes: > > >customer.com. IN MX 10 mx.yourdomain.com. > >mx.yourdomain.com. IN CNAME mx.outsourcer.com. > >mx.outsourcer.com. IN A ... > > That's just the same as > > | customer.com. IN MX 10 mx.outsourcer.com. > | mx.outsourcer.com. IN A ... > > except to people with half-a-knowledge about DNS queries. It's the same in layer 7, but not in layer 8. If you decide to change outsourcing companies, you have to get hundreds of customers to change their MX records, instead of just changing one CNAME record. I used to work at an ISP, and we provided slave DNS for many customers. At various times we had to change the names and/or addresses of our servers, as the business grew (e.g. when we acquired other companies, and wanted to migrate the domains they were hosting to our servers). We frequently saw obsolete glue records in our customers' domains years after these changes, and they often found their way into caches so they interfered with other domains we hosted as well. So anything you can do to avoid depending on customers to make changes at their end makes operating a business easier. -- Barry Margolin, bar...@alum.mit.edu Arlington, MA *** PLEASE don't copy me on replies, I'll read them in the group *** _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users