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From: Stan Hoeppner on 7 Mar 2010 00:08
mouss put forth on 3/6/2010 6:03 PM:
> Stan Hoeppner a �crit :
>> [snip]
>> A web server with a single IP address hosting 378 vitural domains. Should
>> it have 379 PTRs? One for the host itself and one for each virtual domain?
>> Of course not.
>>
>> A mail server with a single IP address hosting 378 mail domains? Should it
>> have 379 PTRs? One for the host itself and one for each virtual MX domain?
>> Of course not. In this case, the DNS infrastructure isn't smart enough to
>> return matching records even though they do exist, so why bother?
>
> Stan, you're confused. What is "asked" for is:

I'm not confused at all mouss. I was mocking Greg with an absurd example of
what he espouses here:

Greg A. Woods put forth on 3/6/2010 2:58 PM:

> For every hostname pointing at an IP address, there should be a
> corresponding PTR for that address pointing back at the hostname.

My example exactly matches what he says. What he says is incorrect. I was
drawing attention to his absurd suggestion with an example of absurdity.

--
Stan

From: mouss on 7 Mar 2010 17:52
Stan Hoeppner a �crit :
> mouss put forth on 3/6/2010 6:03 PM:
>> Stan Hoeppner a �crit :
>>> [snip]
>>> A web server with a single IP address hosting 378 vitural domains. Should
>>> it have 379 PTRs? One for the host itself and one for each virtual domain?
>>> Of course not.
>>>
>>> A mail server with a single IP address hosting 378 mail domains? Should it
>>> have 379 PTRs? One for the host itself and one for each virtual MX domain?
>>> Of course not. In this case, the DNS infrastructure isn't smart enough to
>>> return matching records even though they do exist, so why bother?
>> Stan, you're confused. What is "asked" for is:
>
> I'm not confused at all mouss. I was mocking Greg with an absurd example of
> what he espouses here:
>
> Greg A. Woods put forth on 3/6/2010 2:58 PM:
>
>> For every hostname pointing at an IP address, there should be a
>> corresponding PTR for that address pointing back at the hostname.
>
> My example exactly matches what he says. What he says is incorrect. I was
> drawing attention to his absurd suggestion with an example of absurdity.
>

Ah sorry. I read it the other way...

From: Jesper Dybdal on 8 Mar 2010 16:50
On Sat, 06 Mar 2010 22:01:14 +0100, mouss <mouss(a)ml.netoyen.net> wrote:

>- OP's reverse DNS is borked:
>$ host 188.183.91.18
>18.91.183.188.in-addr.arpa domain name pointer
>0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk.
>$ host 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk.
>Host 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk. not found:
>3(NXDOMAIN)
>
>so OP not only has a "generic" name, but it doesn't resolve back to the
>IP. If he can get his ISP to fix his reverse (preferably using a custom
>reverse), then maybe things will get better.

The ISP in question is the largest Danish ISP, TDC, of which I am also a
customer. They are generally quite good at having consistent forward
and reverse DNS records.

I expect that if the OP points out the missing A record for
"0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk." in a mail to
"hostmaster at tele dot dk", then they will fix it. And that will
probably solve the problem, regardless of the HELO name.

Alternatively, since I suspect from the reverse DNS name that the OP's
connection is a "Pro" grade ADSL product, he can probably get TDC to set
the reverse DNS of his IP address to his own name ("soapnut.dk.") simply
by asking TDC at that same mail address.

From: mouss on 8 Mar 2010 17:44
Jesper Dybdal a �crit :
> On Sat, 06 Mar 2010 22:01:14 +0100, mouss <mouss(a)ml.netoyen.net> wrote:
>
>> - OP's reverse DNS is borked:
>> $ host 188.183.91.18
>> 18.91.183.188.in-addr.arpa domain name pointer
>> 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk.
>> $ host 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk.
>> Host 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk. not found:
>> 3(NXDOMAIN)
>>
>> so OP not only has a "generic" name, but it doesn't resolve back to the
>> IP. If he can get his ISP to fix his reverse (preferably using a custom
>> reverse), then maybe things will get better.
>
> The ISP in question is the largest Danish ISP, TDC, of which I am also a
> customer. They are generally quite good at having consistent forward
> and reverse DNS records.

well, lesseee

$ host 188.183.91.18
18.91.183.188.in-addr.arpa domain name pointer
0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk.
$ host 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk.
Host 0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk. not found:
3(NXDOMAIN)

so rdns is borked. chances are this is intentional...

compare this with the 2d french ISP situation:

$ host 82.239.111.7
7.111.239.82.in-addr.arpa domain name pointer
mon75-10-82-239-111-7.fbx.proxad.net.
$ host mon75-10-82-239-111-7.fbx.proxad.net
mon75-10-82-239-111-7.fbx.proxad.net has address 82.239.111.7

so rdns is correctly configured.

now all this is "generic" names. so compare with (which the said second
ISP allows you to configure using your web UI, for no fee):

$ host 82.239.111.75
75.111.239.82.in-addr.arpa domain name pointer ouzoud.netoyen.net.
$ host ouzoud.netoyen.net.
ouzoud.netoyen.net has address 82.239.111.75

anyway, back to tele.dk, I have
/^0x\d+\.cpe\..*\.customer\.tele\.dk$/
REJECT generic hostname. Please use your ISP relay or fix your
hostname.


> I expect that if the OP points out the missing A record for
> "0xbcb75b12.cpe.ge-1-1-0-1112.hcnqu2.customer.tele.dk." in a mail to
> "hostmaster at tele dot dk", then they will fix it. And that will
> probably solve the problem, regardless of the HELO name.

since you are a customer, it would be good if you contact them to fix
their rdns (I wonder if it not intentional). and more importantly, I'd
like to know if they provide custom rdns freely or at least for a
reasonable price.

>
> Alternatively, since I suspect from the reverse DNS name that the OP's
> connection is a "Pro" grade ADSL product, he can probably get TDC to set
> the reverse DNS of his IP address to his own name ("soapnut.dk.") simply
> by asking TDC at that same mail address.

not sure. here in .fr, the major ISP is Orange, and you can only get a
custome rdns if you pay for (while it's free with the 2d ISP, which is
free.fr/proxad). but Orange block port 25 (well, not sure it's been
completed...).

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