How do you separate an exchange server from the www ip address with the same domain on 2 ISPs ?
While attempting to host a business website an issue has developed, the business has an exchange server pointed to from the current ISP via a telecom MAX record entry?, and we had hoped to edit the A record with the new ISP IP address. What are the potential risk having two ISP’s, 1 pointer for email server and 1 for their website using the same domain.
I’m not sure I understand your question correctly.
First of all, an A record is an Alias record; it must reflect back to a C (Canonical) record. So when you say you’re going to edit the A record, I assume you mean you’re going to have it point back to a different C record.
As for the issues, it’s a recommended practice to have multiple DNS servers (or any other kind, for that matter) for redundancy. You’ll have to make one a master and any others as slaves, then set up domain transfers to keep them all in sync.
There are lots of free resources for how to do this on the web, but if you’re going to be doing a lot of DNS administration, I highly recommend the O’Reilly book by by Albitz and Liu – absolutely worth every penny.
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