And then there is 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.
Make sure your PTR and A records match. For every IP address, there
should be a matching PTR record in the in-addr.arpa domain. If a
host is multi-homed, (more than one IP address) make sure that all IP
addresses have a corresponding PTR record (not just the first one).
Failure to have matching PTR and A records can cause loss of Internet
services similar to not being registered in the DNS at all. Also,
PTR records must point back to a valid A record, not a alias defined
by a CNAME. It is highly recommended that you use some software
which automates this checking, or generate your DNS data from a
database which automatically creates consistent data.
dave
-----Original Message-----
From: Alex van den Bogaerdt
[mailto:alex(_at_)ergens(_dot_)op(_dot_)het(_dot_)net]
Sent: Thursday, 24 November 2005 1:54 AM
To: spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
Subject: Re: [spf-discuss] Re: SPF adoption statistics
On Wed, Nov 23, 2005 at 03:23:35PM +0000, Graham Murray wrote:
My mistake, I should have said client as it is the client
which sends
EHLO to the server. There is no need for the client's IP address to
have a PTR record.
I'll see your statement without proof, and raise you RFC1033 which
tells me otherwise:
"INSTRUCTIONS
[...]
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.
"
Alex
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