Le 22/04/2021 à 21:14, Sonic a écrit :
You could run Postfix in a container (LXC) on the host. It would have
it's own IP and it's own resolv.conf.
Would'nt the chroot feature built in postfix sufficient for this ?
- Message from Wietse Venema -
Date: Thu, 22 Apr 2021 10:01:09 -0400 (EDT)
From: Wietse Venema
Subject: Re: Specific DNS server
To: si...@simonandkate.net
Cc: postfix-users@postfix.org
Simon Wilson:
Is there a way to make Postfix/postscreen use a specific DNS
You could run Postfix in a container (LXC) on the host. It would have
it's own IP and it's own resolv.conf.
>I was once I need to get exactly this.
>I solved this by setting up my own nameserver at localhost, that
>delegates
>internal names to resolve by internal nameserver, and external ones to
>resolve by external nameserver. It can be done pretty easy if you can
>distinguish internal from external na
Dnia 22.04.2021 o godz. 17:24:34 Benny Pedersen pisze:
> >I was once I need to get exactly this.
> >I solved this by setting up my own nameserver at localhost, that
> >delegates
> >internal names to resolve by internal nameserver, and external ones to
> >resolve by external nameserver. It can be do
Dnia 22.04.2021 o godz. 09:33:04 @lbutlr pisze:
>
> What? /etc/hosts is processed before DNS, that is how adding adservers to
> /etc/hosts blocks those adservers from being accessed.
At least in Linux, it actually depends on the contents of file
/etc/nsswitch.conf . If there's an entry like "host
On some OS the following code works - I use that for regression
testing when I need fake DNS data:
void
dns_setns(struct in_addr *ns, unsigned int port)
{
if ((_res.options & RES_INIT) == 0)
(void) res_init();
_res.nsaddr_list[0].sin_family = AF_INET;
_res.n
On Thu, Apr 22, 2021 at 5:21 PM Benny Pedersen wrote:
> On 2021-04-22 16:44, Marco Pizzoli wrote:
>
> > I am afraid you did not get my point.
>
> i dont know your solution then
>
> rpz and qname can be problematic
>
> https://labs.ripe.net/author/wouter_de_vries/making-the-dns-more-private-with-q
On Thu, Apr 22, 2021 at 04:53:21PM +0200, Jaroslaw Rafa wrote:
> > I needed to have Postfix to solve Internet DNS names, for obvious reasons.
> > At the same time, I needed to be able to solve Intranet DNS names:
> > monitoring server, backup server, etc...
>
> I was once I need to get exactly th
On 22 Apr 2021, at 09:20, Benny Pedersen wrote:
> n 2021-04-22 16:44, Marco Pizzoli wrote:
>> Due also to some other constraints, I ended up relying on static
>> entries in /etc/hosts.
>
> this file is only for when real dns server is down, not used when dns server
> is up
What? /etc/hosts is p
On 2021-04-22 16:53, Jaroslaw Rafa wrote:
Dnia 22.04.2021 o godz. 16:44:13 Marco Pizzoli pisze:
I needed to have Postfix to solve Internet DNS names, for obvious
reasons.
At the same time, I needed to be able to solve Intranet DNS names:
monitoring server, backup server, etc...
I was once I
On 2021-04-22 16:44, Marco Pizzoli wrote:
I am afraid you did not get my point.
i dont know your solution then
rpz and qname can be problematic
https://labs.ripe.net/author/wouter_de_vries/making-the-dns-more-private-with-qname-minimisation/
I needed to have Postfix to solve Internet DNS
Dnia 22.04.2021 o godz. 16:44:13 Marco Pizzoli pisze:
>
> I needed to have Postfix to solve Internet DNS names, for obvious reasons.
> At the same time, I needed to be able to solve Intranet DNS names:
> monitoring server, backup server, etc...
I was once I need to get exactly this.
I solved this
Would it be an option to configure a policy for your DNS server to
**not** send queries from postfix host(s) through the add&tracker filter?
Cheers
tobi
On 4/22/21 12:20 PM, Simon Wilson wrote:
> Is there a way to make Postfix/postscreen use a specific DNS server?
>
> Reason for
On Thu, Apr 22, 2021 at 4:37 PM Benny Pedersen wrote:
> On 2021-04-22 12:58, Marco Pizzoli wrote:
> > Hello,
> > +1 for this Request for Improvement.
> > I also faced this need.
> >
> > Changing the machine solver was, unfortunately, not an option.
>
> we all love 127.0.0.1
>
> solution is to not
On 2021-04-22 12:58, Marco Pizzoli wrote:
Hello,
+1 for this Request for Improvement.
I also faced this need.
Changing the machine solver was, unfortunately, not an option.
we all love 127.0.0.1
solution is to not have spamasassin running on same host as postfix, or
tell spamassassin to use
Sven Schwedas:
> On 22.04.21 16:08, Lars Liedtke wrote:
> > I know this does not apply to all kinds of setup, but with
> > virtualization and containerization it should be easy to seperate
> > Postfix and provide a different nameserver in resolv.conf for it.
>
> Yes, but postfix' builtin chroot is
>
> (We're using systemd-nspawn, so if *that* works, anything proper
> definitely will.)
>
>> Am 22.04.21 um 16:03 schrieb Wietse Venema:
>>> Markus Sch?nhaber:
>>>> 22.04.21, 12:20 +0200, Simon Wilson:
>>>>
>>>>> Is there
fix/postscreen use a specific DNS server?
One way I could think of is to use postfix' chroot features and
configure this specific DNS server in the chroot's resolv.conf.
That may or may not work. There is no supported way to prevent the
SYSTEM LIBRARY from picking up the resolv.conf file befo
>> Is there a way to make Postfix/postscreen use a specific DNS server?
>
> Edit /etc/resolv.conf.
>
> No kidding - Postfix uses the SYSTEM LIBRARY for DNS lookups, and
> the SYSTEM LIBRARY uses the resolv.conf file. Theree are no plans
> to re-implement this part
:20 +0200, Simon Wilson:
>>
>>> Is there a way to make Postfix/postscreen use a specific DNS server?
>> One way I could think of is to use postfix' chroot features and
>> configure this specific DNS server in the chroot's resolv.conf.
> That may or may not work.
Markus Sch?nhaber:
> 22.04.21, 12:20 +0200, Simon Wilson:
>
> > Is there a way to make Postfix/postscreen use a specific DNS server?
>
> One way I could think of is to use postfix' chroot features and
> configure this specific DNS server in the chroot's resolv.
Simon Wilson:
> Is there a way to make Postfix/postscreen use a specific DNS server?
Edit /etc/resolv.conf.
No kidding - Postfix uses the SYSTEM LIBRARY for DNS lookups, and
the SYSTEM LIBRARY uses the resolv.conf file. Theree are no plans
to re-implement this part of the SYSTEM LIBRARY
22.04.21, 12:20 +0200, Simon Wilson:
> Is there a way to make Postfix/postscreen use a specific DNS server?
One way I could think of is to use postfix' chroot features and
configure this specific DNS server in the chroot's resolv.conf.
--
Regards
mks
Hello,
+1 for this Request for Improvement.
I also faced this need.
Changing the machine solver was, unfortunately, not an option.
Thanks
Marco
On Thu, Apr 22, 2021 at 12:21 PM Simon Wilson
wrote:
> Is there a way to make Postfix/postscreen use a specific DNS server?
>
> Reaso
Is there a way to make Postfix/postscreen use a specific DNS server?
Reason for the question:
My network has an internal (non-ISP forwarding) DNS server for both
internal and external resolution, and that is default nameserver
across the network including for the mail server. That DNS server
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