1 Reply Latest reply: Oct 6, 2013 4:38 AM by Tommyreynolds-Oracle RSS

    Understanding of forward zone file

    975148

      There is DNS implemented in our setup but I am not able to understand some of the entries in the forward zone file. The DNS entries in the forward zone file, fion.co.in.zone are like:

       

      -------------------------------------------------------------------------------------------------------------------------------------------------------

      $TTL       86400

      $ORIGIN fion.co.in.

      @                IN SOA localns1.fion.co.in.   admin.fion.co.in.  (

                                                                                      42                           ; serial (d. adams)

                                                                                      3H                           ; refresh

                                                                                      15M                       ; retry

                                                                                      1W                         ; expiry

                                                                                      1D )        ; minimum

       

                          IN       NS          localns1.fion.co.in.

                          IN       MX         10           mail.fion.co.in.

      ---------------------------------------------------------------------------------------------------------------------------------------------------------

      I have the following queries with regard to the above file:

       

      1) The hostname of the server is the same one on which it is hosted which is bssossapp01.snl.com. But, I am not able to understand the entry localns1.fion.co.in. Is it possible that there are multiple hostname aliases for a server?

      2) How to determine the entry to be put in hostmaster-email directive which is showing as admin.fion.co.in in our setup?

      3) How to determine the email-server-name in the MX record which is showing as mail.fion.co.in as above?

       

      I hope, my query is clear of how to understand the entries in the forward zone file.

       

      Please revert with the reply to my query.

       

      Regards

        • 1. Re: Understanding of forward zone file
          Tommyreynolds-Oracle

          $TTL       86400

          $ORIGIN fion.co.in.

          @   IN SOA localns1.fion.co.in.   admin.fion.co.in.  (

                     42                           ; serial (d. adams)

                     3H                           ; refresh

                     15M                          ; retry

                     1W                           ; expiry

                     1D                           ; minimum

          )

           

             IN       NS          localns1.fion.co.in.

             IN       MX         10           mail.fion.co.in.

           

          1) The hostname of the server is the same one on which it is hosted which is bssossapp01.snl.com. But, I am not able to understand the entry localns1.fion.co.in. Is it possible that there are multiple hostname aliases for a server?

           

          "localns1.fion.co.in." is just the name of the originating host.  It's basically an embedded comment.

           

          2) How to determine the entry to be put in hostmaster-email directive which is showing as admin.fion.co.in in our setup?

           

          This is the email address of whom should be contacted if a DNS user detects a problem or has a question.  Just change the email "@" to a dot "." and you are done.

           

          3) How to determine the email-server-name in the MX record which is showing as mail.fion.co.in as above?

          This is the fully-qualified domain name for the server that you want mail sent to this domain to handle.  When sendmail has a piece of mail, it determines the domain and then does the equivalent of:
             $ dig -t MX fion.co.in
          and then uses the prioritized list of mail handlers as destinations to try sending the piece of mail.