[RFCI-Discuss] is a reversename a must ?

[csmailreport]

Hi,

We had this discussion a few months ago,
and while RFC 1912 states "SHOULD" and is informational,
Derek concluded that having a PTR RR record (reverse DNS)
is a requirement from RFC 1033, section "INSTRUCTIONS: Adding a host":

http://www.faqs.org/rfcs/rfc1033.html

   Adding a host.
      To add a new host to your zone files:
         Edit the appropriate zone file for the domain the host is in.
         Add an entry for each address of the host.
         Optionally add CNAME, HINFO, WKS, and MX records.
         Add the reverse IN-ADDR entry for each host address in the
         appropriate zone files for each network the host in on.

Note that the "Optionally" is missing from from the last paragraph,
and that RFC 1033 precedes the codification of RFC keywords
(MUST/SHOULD/MAY/etc.)

PS: refusing to accept email from IP addresses lacking a PTR record
(enforcing RFC 1033) indeed allows you to get rid of a tremendous
amount of spam (we do that here).
And if it has a PTR record, it provides you an easy abuse at domain
address to either complain/report spam to, or to list on RFCI :-)

Best regards
-- Nicolas


On 1/22/08, mouss <mouss at netoyen.net> wrote:
> Jeff Pang wrote:
> > -----Original Message-----
> >
> >> From: Matus UHLAR - fantomas <uhlar at fantomas.sk>
> >> Sent: Jan 22, 2008 4:04 AM
> >> To: rfci-discuss at lists.megacity.org
> >> Subject: Re: [RFCI-Discuss] is a reversename a must ?
> >>
> >> rfc 1912:
> >>
> >> 2.1 Inconsistent, Missing, or Bad Data
> >>
> >>   Every Internet-reachable host should have a name.  The consequences
> >>   of this are becoming more and more obvious.  Many services available
> >>   on the Internet will not talk to you if you aren't correctly
> >>   registered in the DNS.
> >>
> >> it's should, even not SHOULD but it says so. It even means that others
> are
> >> not required to communicate with you if you don't have reverse DNS.
> >>
> >>
> >
> > "Every Internet-reachable host should have a name".
> > Yes I agree.But it's primarily an A record name, not meaning the PTR
> record name.Is it?
> >
>
> The same RFC continues:
>
> 	Make sure your PTR and A records match.
>
>
>
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