Alasdair Campbell wrote:
> My registrar's refresh, minimum and expire values are unusual values
> according to a DNS report from Men & Mice.

I'm considering running bind myself, so that I can set low values and
test changes to my zone files systematically. (I'm not saying
configuring bind is easy, however) :-)

Alasdair Campbell a écrit :
>
> Also the backup name server ns2,heartinternet.co.uk is not responding.

From here it is.

> I *have* mis-configured some settings for CNAMEs and MX records as their
> instructions were quite poor. and didn't differentiate when a trailing
> (,) would be necessary and when not.

It looks much better now.

Alasdair Campbell a écrit :
>
> I'm considering running bind myself

Running a nameserver on a dynamic IP address is generally not considered
a good idea.

Pascal Hambourg wrote:
> Alasdair Campbell a écrit :
>> I *have* mis-configured some settings for CNAMEs and MX records as
>> their instructions were quite poor. and didn't differentiate when a
>> trailing (,) would be necessary and when not.
>
> It looks much better now.

Thanks Pascal, I will continue checking and hopefully get everything
working soon. I will not attempt running Bind ona dynamic IP :-)

Do you have an opinion on the settings for refresh, retry & minimum - do
they seem excessive? Refresh is set to one week.

best,
Alasdair

Alasdair Campbell a écrit :
>
> Do you have an opinion on the settings for refresh, retry & minimum - do
> they seem excessive? Refresh is set to one week.

Zonecheck says that the 'refresh' interval is too high, it should be
between 1 hour and 2 days. Also the 'expire' interval should be at least
7 times bigger than the 'refresh' interval. Dnsreport adds that the
'retry' interval is too high and should be decreased to 2 hours.

"Alasdair Campbell" <news@alasdaircampbell.com> wrote in message
news:5qg2auFvqrjsU1@mid.individual.net...
> Hi,
>
> I've successfully transferred my domains and am currently waiting for
> the worlds nameservers to catch up. I've one question about DNS and in
> particular how MTAs query a domain name before posting.
>
> My domains all have CNAME aliases for 'www' pointing to my dynamic ip
> (dyndns hostname). I have no A records as I have no static IP to point
> them to.
>
> Will this cause problems in the long run with MTAs? when I try to send a
> n email to one of the domains I get this error:
>
> Host or domain name not found. Name service error for
> name=alasdaircampbell.com type=A: Host found but no data record of
> requested type
>
> Seems like it's failing because of the missing A record. But I can't see
> any other way to have this setup. (Can't get static IP with current ISP).

There is no requirement for a domain to have any hosts, so what is the problem?

One of my relatives has a domain that lacks A records. It has only NS, MX, and
CNAME records, all of which point to hosts in other domains. He gets his e-mail
just fine. He has no web site nor any other need for a host other than the ones
that accept his incoming mail.

To answer your question of "how do MTAs query", RTF-RFC (2821).

D. Stussy wrote:
> There is no requirement for a domain to have any hosts, so what is the problem?

The problem would be if I had not configured my MX RR correctly and was
losing mail.

> To answer your question of "how do MTAs query", RTF-RFC (2821).
>

The RFC explains it very well, thanks for the hint.

The reason I saw 'A' type not found was because there was no MX type
there to have priority over it. No CNAME pointed at an MX type RR. As
there was no 'A' record to be qualified as a MX type with preference 0.

As this is the last chance of resolution (? qualification) this is the
error message I see?

I think I'll still play with BIND and an unused domain, at least to get
my head round all this.

D. Stussy wrote:
> There is no requirement for a domain to have any hosts, so what is the problem?

There would be a problem if I'd misconfigured my MX RR and was losing mail.

> To answer your question of "how do MTAs query", RTF-RFC (2821).

The rfc explains it very well, thanks for the hint.

There is no 'MX' RR. No CNAME pointing to a 'MX' RR or 'A' RR that will
be qualified as 'MX' type with preference 0. There's also no 'A' RR that
will be qualified as MX type with preference 0, so I see that message?