DNS recs, a beginners question

[Stephane Bortzmeyer]

On Thu, Sep 16, 2004 at 08:23:53AM +0200,
 Arun Dev <nospam at pleaz.xy> wrote 
 a message of 51 lines which said:

> I know this is a really newbie question. 

Moreover, this is a question that could be solved by setting up a
dummy name server at home and testing with BIND. Any second-hand PC
with a free Unix is more than enough for learning DNS by practice.

Moreover, you gave no indication on the name servers. I assume they
were:

ns1.schoolx.yz with the IP address X.Y.Z.T (the primary)
ns1.isp.net with the IP address O.P.Q.R (a secondary)

Zone file of schoolx.yz :

$TTL 86400
@                       IN      SOA     ns1.schoolx.yz.     hostmaster.schoolx.yz. (
                                        2004091701      ;serial
                                        21600   ;refresh 
                                        3600    ;retry 
                                        3600000 ;expire 
                                        86400 ); minimum 
                        IN     TXT      "Domain configured without any warranty"
                        IN      NS      ns1
                        IN      NS      ns1.isp.net.
                        IN     TXT      "v=spf1 a:mail.schoolx.yz -all"
                        IN      MX      10  iron

ns1                     IN      A       X.Y.Z.T
iron                    IN      A       A.B.C.D
www                     IN      CNAME   iron
mail                    IN      CNAME   iron

Zone file of c.b.a.in-addr.arpa (you have the delegation of the /24?) :

$TTL    86400
@                       IN      SOA     ns1.schoolx.yz.     hostmaster.schoolx.yz. (
                                        2004091701      ;serial
                                        21600   ;refresh 
                                        3600    ;retry 
                                        3600000 ;expire 
                                        86400 ); minimum 
                        IN     TXT      "Domain configured without any warranty"

d                       IN  PTR iron.schoolx.yz.

>   - the outgoing mail should carry from addresses in the form
>   user at schoolx.yz

This is a mail issue , off-topic for this list. What is the mail
server software?

>   - our provider's mail server should store incoming mail in case
>   the machine or the SMTP daemon is down

Bad idea, IMHO, so I did not implement it. (Unless you have a very
good working relationship with the ISP.)