Re: DNS PTR record

[Ronald van der Westen <rvdwesten () gmail com>]

Hi,

What are you trying to achieve with this?
It looks like there is a PTR record for the y.y.y.231 which points to
mail.domain.com.
And mail.domain.com points to y.y.y.230, are you sure there are not
multiple A-records for mail.domain.com?
Where does the PTR for .230 point to?

What did you expect to happen?

This is probably the result of not cleaning old records, or just a
wrong configuration, nothing special, quite common ;-)

-Ronald

On Sat, Feb 28, 2009 at 4:31 PM, Abo Sous <abussous () gmail com> wrote:
> Hi List,
>
> i am digging a mail server and a router on my domain; i get the
> following results:
>
> 1- the dig domain.com MX gives me:
> ;; QUESTION SECTION:
> ;domain.com                                 IN            MX
>  ;; ANSWER SECTION:
> domain.com.                  20778      IN            MX          10
> mail.domain.com.
>  ;; ADDITIONAL SECTION:
> mail.domain.com.                          20778      IN            A
>          y.y.y.230
>
> 2- the dig -x y.y.y.231 (the router) gives me:
> ;; QUESTION SECTION:
> ;231.y.y.y.in-addr.arpa.        IN      PTR
>
> ;; ANSWER SECTION:
> 231.y.y.y.in-addr.arpa. 21495 IN        PTR     mail.domain.com.
>
> obviously, the output from step number 2 is wrong
>
> my question is: where could this error possibly lead to? what are the
> vulnerabilities / security issues that might arise from this?
>
> thanks in advance,
>
> -A/S



-- 
Ronald van der Westen