Re: PTR record setup

Gregg Hill <bogus@xxxxxxxxxxx> wrote:
Begs what question?

I guess what I meant is, "What is to stop a person from setting up a
PTR record on their DNS host's servers or their own public-facing DNS
server?"

Hell, there's nothing to stop you. But they won't do any good, so why
bother? I can create a zone for microsoft.com on my server, but it won't
have any effect outside my own network.

Not that I would do it, but why CAN'T it be done?

Check out how RDNS works here -
http://en.wikipedia.org/wiki/Reverse_DNS_lookup

I do not understand **why** it can only be done by the ISP. Is there
something in the lookup mechanism that makes it only work if the ISP
did it?
Gregg Hill

Yes, if you understand *where* anyone is looking for this information. :-)




"Lanwench [MVP - Exchange]"
<lanwench@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:OXoAZZ1kIHA.1280@xxxxxxxxxxxxxxxxxxxxxxx
Gregg Hill <bogus@xxxxxxxxxxx> wrote:
Hello!

While discussing PTR records for mail servers in a Vamsoft ORF
newsgroup, the question came up about who can set up a PTR and
where. I had always been told that only the owner of the IP block
could set up the PTR record, i.e., the ISP has to do it.

That'scorrect. Or, they can delegate it to you, but the odds of them
doing that are slim to none.


This question came up:

"I wonder what happens if the ISP customer's authoritative Name
Servers publish a PTR record for their ISP-assigned IP address--

OK. Where would the customer be doing this?

both
in the cases that the ISP does and doesn't have a PTR in their own
Name Servers. Is there some mechanism that keeps the customer's
PTRs from being looked-up by the Internet?"

So according to everything I have read (mostly posts in here), the
ISP has to do it.

Yes, as per above.

The question is, why can't anyone do it on their
own DNS server, or on their DNS host such as GoDaddy, etc?

This somewhat begs the question :-)



Thank you!

Gregg Hill



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Relevant Pages

  • Re: PTR record setup
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