PTR question

L1nuxn00b703 · 06-25-2012, 10:23 PM

Hi all,
Does the PTR record have to match the MX record or can it match the domain name?

Below is example.com zone file:

Code:

$ORIGIN example.com.
example.com.          IN      MX      10      mail
example.com.          IN      A       1.1.1.1
mail                  IN      A       1.1.1.1

Will setting the PTR to example.com work or does it HAVE to point to mail.example.com?

Code:

1.1.1.1          IN   PTR     example.com
OR
1.1.1.1          IN   PTR     mail.example.com

DOes it matter? will both work?

routers · 06-26-2012, 02:57 AM

1) purpose PTR is to resolve ip to domain . normaly limited to 1 domain
2) to resolve domain to ip we use "A" record , can be multiple domain for 1 ip

for the below is not OR . its either one

Code:

1.1.1.1          IN   PTR     example.com
OR
1.1.1.1          IN   PTR     mail.example.com

cheers