Trying to run a server on a static IP from my house, DNS questions

Smoot Carl-Mitchell smoot at tic.com
Thu Dec 25 19:28:49 UTC 2008


On Thu, 2008-12-25 at 01:27 -0500, Xn Nooby wrote:

> My MX record is:
> 0   @   mail.mydomain.com

This does not look right.  The normal sematics in a DNS zone file of the
'@' is the domain name in the $ORIGIN meta statement.  Normally, it is
set to the basename of the domain.  An MX record should look like:

@ MX 5 mail

In DNS terminology names which do not end in a '.' have the $ORIGIN
domain appended.  In the above record "mail" is expanded to
'mail.mydomain.com.', assuming the $ORIGIN statement is 'mydomain.com.'.
The above record is equivalent to:

mydomain.com. MX 5 mail.mydomain.com.

You can look up the relevant standards for the details of zone file
syntax.  The DNS is defined in RC1034 and RFC1035.
-- 
Smoot Carl-Mitchell
System/Network Architect
smoot at tic.com
+1 480 922 7313
cell: +1 602 421 9005




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