Revise DNS settings for Exchange 2013
Posted on 2013-10-17
I know that DNS can be a "religious topic", and I have had cases where even poorly implemented DNS works adequately, but following an upgrade to Ex13, I want to take a fresh look at my DNS settings since some of them date back to the guy before me and probably back to an NT domain.
First question, under primary domain->DomainDNSZones->_tcp there is a _ldap entry for a DC that has been gone for many years (and no longer in AD). Can I just delete this? Also in reverse lookup for the same domain I found NS entries that were from yesteryear and I deleted them. Was this ok to do?
Also, we accept mail for our primary domain and a few variants all of which are listed in DNS but only the primary is part of AD. Each alternate domain has a mailserver.alt-domain.com MX record that points to the primary domain Exchange server. I just read to NOT have MX records internally since the clients know how to get to the server already. Should I delete these?
And finally, there is a CNAME record in all the alternate domains named '*' that points to the primary webserver (now gone anyway and hosted outside). I think I should delete these guys. Correct?
Oh and one more - I had an entry called 'legacy' that was used to point to the Ex07 server during my migration to Ex13. I assume I can kill this, too?
Any Microsoft DNS guys up on Exchange 2013 that can advise me on this? Thanks.