DNS and CNAME Records

Posted on 2011-05-05
Last Modified: 2012-05-11
I want to add a CNAME record to my internal DNS but unsure it is will cause a problem.

Current CNAME record for my company website is which points to a server

I want to add ---- pointint to same server

My question is the mycompany portion is the name of the ZONE as well and I was not sure if this would cause a problem when setting this CNAME up.
Question by:pterranova13
    LVL 8

    Expert Comment

    Yes, will be the name of the zone. Then you just add a CNAME record leave the first line blank because you want the root zone name to point to the new address. This will not cause a problem unless you have other DNS records such as or In which case you then have to set up all of thier respected DNS entries also for your internal addresses, including MX records for mail servers.
    LVL 8

    Expert Comment

    Scratch that, you probably don't need to setup MX records, just A records and CNAME records. It will look something like this:

    Forward Lookup Zone:
    NAME:                               Type:                      DATA:
    (same as parent folder)    CNAME         
    www                                CNAME         
    mail                                    A                            192.168.X.X

    LVL 70

    Expert Comment

    by:Chris Dent

    > (same as parent folder)    CNAME         

    Cannot be a CNAME.

    Violates RFCs, and the vast majority of DNS servers simply will not permit it.

    It must be a Host (A) record and therefore must use an IP address.

    LVL 8

    Expert Comment

    Yes, actually that is true you will need to get the IP address of and use an A record.
    LVL 25

    Accepted Solution

    Bear in mind that if is an Active Directory domain, there are already (or should be, anyway) blank host records in the corresponding zone that point to your domain controllers, and creating another one that points to something other than a DC can have negative consequences.

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