Hi thanks again for quick reply.
Do I understand right? Would it be accurate if i put an authoritative DNS
server and QMT on separate computers?
Marek
----- Original Message -----
From: "Eric Shubert" <e...@shubes.net>
To: <qmailtoaster-list@qmailtoaster.com>
Sent: Monday, February 14, 2011 8:58 PM
Subject: [qmailtoaster] Re: DNS temporary failure if one DNS server dont
work.
Hey Marek,
Using Bind is fine, but using a single server/process for both
authoritative and resolver purposes is not a good practice. It can be
done, but I would try very hard to keep them separate before endeavoring
to put them together. It can be done, but it's a bit tricky to do well
(accurately and securely).
If at all possible, I would use an authoritative DNS server that's
external to QMT, then simply install the caching-nameserver package on QMT
to use as a resolver. You should also modify the resolver's configuration
to use forwarders, but that's not absolutely necessary. caching-nameserver
configuration should work ok as is.
Martin, do you have anything to add? (Sorry for jumping in again)
--
-Eric 'shubes'
On 02/14/2011 12:14 PM, d...@demod.pl wrote:
Thank You for advice.
I think, I must learn about DNS much more as I thought before i wrote
these emails.
I'm using BIND (named).
Yes it's authoritative DNS server and i think it's a local resolver. Now
I understand it's wrong practice?
Now i'm going to try apply you advices and read something more about DNS
server.
I will let you know about my progress
regards
Marek
----- Original Message ----- From: "Eric Shubert" <e...@shubes.net>
To: <qmailtoaster-list@qmailtoaster.com>
Sent: Monday, February 14, 2011 4:24 PM
Subject: [qmailtoaster] Re: DNS temporary failure if one DNS server dont
work.
I agree whole heartedly with Martin (whatever that's worth).
Two key questions which haven't been answered yet by Marek:
1) which software is he using (bind or djbdns)
2) is he using the local resolver as an authoritative DNS server as
well? (I would hope not, but you never know).
I gotta chuckle regarding Marek's name, as there is a commercial email
server called "Marek Mail". :)
Thanks, Martin. I'll let you finish up with this one.
--
-Eric 'shubes'
On 02/14/2011 01:39 AM, Martin Waschbüsch wrote:
Seeing as it does not work right now, I don't know where the servers
are listed on his system. Clearly there must be some configuration
issue.
But at the same time, IMHO it is the best solution to ensure there is
a properly configured local DNS server.
Such a local DNS server has a config where you can list forwarding
DNS servers and that is where his name servers should be configured.
Imagine resolv.conf lists the two outside DNS servers directly.
Let's assume that the first entry (will be queried first) is down.
Although the system tries to send 50 individual mails to
some...@googlemail.com, the mail server will experience a timeout for
the first name server and only then query the secondary server. All
that happens 50 times(!)
Now, if you have a working caching DNS server, as soon as the first
timeout happened and the secondary DNS server was queried, the local
server has the DNS entry stored and the remaining 49 messages do not
encounter any timeout at all.
Martin
--
Martin Waschbüsch
IT-Dienstleistungen
Lautensackstr. 16
80687 München
Telefon: +49 89 57005708
Fax: +49 89 57868023
Mobil: +49 170 2189794
mar...@waschbuesch.de
http://martin.waschbuesch.de
Am 14.02.2011 um 09:06 schrieb Tony White:
Hi,
So what/where are the two dns servers Marek
says he is using?
On 14/02/2011 7:02 PM, Martin Waschbüsch wrote:
That is not correct!
If localhost runs a caching DNS server, it will fetch DNS
information from forwarding DNS servers, which can be the ISP's,
Google's, whatever.
The whole point of having a local caching DNS server is that it not
only takes care of using all DNS servers it knows about to fetch
data, but also to store that data and prevent DNS-lookup-heavy
applications (like E-Mail servers) to generate lots of additional
traffic and overhead.
So, if Marek runs a local DNS server and still gets problems, then
we need to look at that config.
If not, he really should install a caching DNS server (named,
djbdns, etc.)
In any case, resolv.conf is just fine only pointing to the local
server.
Martin
--
Martin Waschbüsch
IT-Dienstleistungen
Lautensackstr. 16
80687 München
Telefon: +49 89 57005708
Fax: +49 89 57868023
Mobil: +49 170 2189794
mar...@waschbuesch.de
http://martin.waschbuesch.de
Am 14.02.2011 um 07:59 schrieb Bruno De Leone:
That means your only DNS is your local DNS so the qmail will never
find any server outside it's network...
You should add the DNS of your preference. For example, to add
google's DNS, edit the file /etc/resolv.conf and add these lines
at the end of the file:
nameserver 8.8.8.8
nameserver 4.4.4.4
On Mon, Feb 14, 2011 at 4:39 AM,<d...@demod.pl> wrote:
In resolv.conf I have only:
"search localdomain
nameserver 127.0.0.1"
----- Original Message ----- From: "Tony White"<t...@ycs.com.au>
To:<qmailtoaster-list@qmailtoaster.com>
Sent: Monday, February 14, 2011 2:55 AM
Subject: Re: [qmailtoaster] DNS temporary failure if one DNS
server dont work.
Marek,
What order are the dns servers in /etc/resolv.conf?
If they are the failing one on line one then reverse them.
On 14/02/2011 9:03 AM, d...@demod.pl wrote:
Thanks for fast reply.
I use 2 named servers.
everyone in different locations. One DNS server is on the same
machine as qmailtoaster and always on. But when secondary DNS on
the other location die i canot send email outside.
----- Original Message ----- From: "Carlos Herrera
Polo"<carlos.herrerap...@gmail.com>
To:<qmailtoaster-list@qmailtoaster.com>
Sent: Sunday, February 13, 2011 10:02 PM
Subject: Re: [qmailtoaster] DNS temporary failure if one DNS
server dont work.
Djbdns or named
2011/2/13, Martin Waschbüsch<mar...@waschbuesch.de>:
What you could try is this:
Have a local caching DNS server and that takes care of resolving
to as many
'real' DNS servers as you like.
Doing so means that your DNS server (local) is ALWAYS on (unless
the daemon
dies) and this problem won't occur again.
Martin
--
Martin Waschbüsch
IT-Dienstleistungen
Lautensackstr. 16
80687 München
Telefon: +49 89 57005708
Fax: +49 89 57868023
Mobil: +49 170 2189794
mar...@waschbuesch.de
http://martin.waschbuesch.de
Am 13.02.2011 um 19:48 schrieb<d...@demod.pl> <d...@demod.pl>:
Hello everyone
I have a problem with my qmailtoster. When one of my DNS server is
down i
cant send email. When i try send email outside i have an error
message:
DNS temporary failure. This hapen even if one DNS server works
correctly.
Does anyone know how can I solve it?
Thanx for you help.
Marek
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Wiadomosc zostala sprawdzona przez program ESET NOD32 Antivirus.
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Wiadomosc zostala sprawdzona przez program ESET NOD32 Antivirus.
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