DNS woes..

Re: DNS woes..

From:

Date:

Time:

On 08/01/02 at 18:02, Mark Moloughney wrote:

> This stuff is a real pain..
>
> If I have...
>
> mmconsulting.com -> 67.92.79.20
> mail.mmconsulting.com -> 67.92.79.4
> www.mmconsulting.com -> mmconsulting.com
> ftp.mmconsultng.com -> mmconsulting.com
>
> Do I have to have the T1 provider set up PTRs for each of these?

You only want one PTR for each IP address. So if the actual records for the
above look something like:

mmconsulting.com. A 67.92.79.20
mail.mmconsulting.com. A 67.92.79.4
www.mmconsulting.com. CNAME mmconsulting.com.
ftp.mmconsulting.com. CNAME mmconsulting.com.

You would want two PTRs in the reverse zone (79.92.67.in-addr.arpa.) that
look like:

4.79.92.67.in-addr.arpa. PTR mail.mmconsulting.com.
20.79.92.67.in-addr.arpa. PTR mmconsulting.com.

The PTR for your mail server should resolve to whatever host name the mail
server knows itself as (i.e., the name it introduces itself to other
servers as). That's not absolutely required, but it will greatly reduce the
number of problems you might have with mail delivery.

> DNS Expert is saying that it still can't find PTRs for the mail one..
>
> Whats up with that?

The reverse zone for your Class C (79.92.67.in-addr.arpa.) is delegated to
ns1.algx.net and ns2.algx.net. The in-addr.arpa. root servers say:

% dig @arrowroot.arin.net. 79.92.67.in-addr.arpa.

;; AUTHORITY SECTION:
92.67.in-addr.arpa. 1D IN NS NS1.ALGX.NET.
92.67.in-addr.arpa. 1D IN NS NS2.ALGX.NET.

ns1.algx.net says:

% dig @ns1.algx.net. 79.92.67.in-addr.arpa.

; <<>> DiG 8.3 <<>> @ns1.algx.net. 79.92.67.in-addr.arpa.
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUERY SECTION:
;; 79.92.67.in-addr.arpa, type = A, class = IN

;; AUTHORITY SECTION:
79.92.67.in-addr.arpa. 1D IN SOA ns1.algx.net.
hostmaster.algx.net. (
2002080165 ; serial
5h13m20s ; refresh
1H ; retry
5w6d16h ; expiry
1D ) ; minimum

The existence of an SOA record, implies that there is actually a
79.92.67.in-addr.arpa. zone on ns1.algx.net. However, neither ns1.algx.net
nor ns2.algx.net return PTRs for either of the above two IP addresses. I'd
guess that your ISP (algx.net?) either hasn't finished setting up the zone
yet, or they've got their thumbs firmly implanted where the sun don't
shine.

--
Christopher Bort | cbort@globalhomes.com
Webmaster, Global Homes | webmaster@globalhomes.com
<http://www.globalhomes.com/>

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