<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Barlow Condensed";
panose-1:0 0 5 6 0 0 0 0 0 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
span.StileMessaggioDiPostaElettronica19
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 2.0cm 2.0cm 2.0cm;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="IT" link="#0563C1" vlink="#954F72" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">do you have any suggestions?<br>
<br>
Is there a way to re-route an incoming request to another backend server if the default one reply with an NXDOMAIN?<br>
<br>
Best<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Simone<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT">----------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";color:black;mso-fareast-language:IT">Simone Beccato</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";color:black;mso-fareast-language:IT"> </span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT">Cloud Architect<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:IT"><img width="72" height="16" style="width:.75in;height:.1666in" id="_x0000_i1026" src="cid:image001.png@01D6FAF9.6C998750"></span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Barlow Condensed";color:black;mso-fareast-language:IT">Via del Bosco Rinnovato, 8</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Barlow Condensed";color:black;mso-fareast-language:IT">20090 Assago (MI)</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:IT"><a href="http://www.it.net/"><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";color:#0070C0">ITnet</span></a></span><span style="font-size:10.0pt;font-family:"Barlow Condensed";color:#0070C0;mso-fareast-language:IT">
</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT">|<b><span style="color:#0070C0">
</span></b></span><span style="mso-fareast-language:IT"><a href="https://www.linkedin.com/company/itnet-srl" target="_blank" title="LinkedIn"><span style="font-size:10.0pt;font-family:"Barlow Condensed";color:#0070C0;border:none windowtext 1.0pt;padding:0cm;background:white">LinkedIn</span></a>
</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT">|<b><span style="color:#0070C0">
</span></b></span><span style="mso-fareast-language:IT"><a href="http://www.otmtinvestments.com/ITnet.html"><span style="font-size:10.0pt;font-family:"Barlow Condensed";border:none windowtext 1.0pt;padding:0cm">Group</span></a></span><span style="font-size:10.0pt;font-family:"Barlow Condensed""><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="mso-fareast-language:IT">Da:</span></b><span style="mso-fareast-language:IT"> dnsdist <dnsdist-bounces@mailman.powerdns.com>
<b>Per conto di </b>Simone Beccato via dnsdist<br>
<b>Inviato:</b> luned́ 1 febbraio 2021 15:42<br>
<b>A:</b> dnsdist@mailman.powerdns.com<br>
<b>Oggetto:</b> [dnsdist] Split horizon and forward zone<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I setup my environment with “split horizon” logic, using two Auth servers, one for public zones and another one for private zones, all works correctly.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Now I want internal clients resolve some public zones with private ips, I know that I can duplicate the zone from public auth server to private auth server changing ip addresses but this way I need to maintain the same zone on both server
with different resolution, example:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="http://www.mycompany.net">www.mycompany.net</a> -> 1.1.1.1 (public resolution)<o:p></o:p></p>
<p class="MsoNormal"><a href="http://www.mycompany.net">www.mycompany.net</a> -> 192.168.1.1 (private resolution)<br>
<br>
I have the zone mycompany.net on both auth servers (public and private) and the record “www” is resolved with “1.1.1.1” on public auth server and “192.168.1.1” on the private one.<o:p></o:p></p>
<p class="MsoNormal">Assuming I need to add a record “<a href="ftp://ftp.mycompany.net">ftp.mycompany.net</a>” only with public resolution i need to configure the record also on the internal auth with the same public ip, otherwise internal client will receive
an NXDOMAIN.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here my question:<br>
Can I manage on dnsdist or pdnsRecursor this issue? I think something like that:<o:p></o:p></p>
<p class="MsoNormal"><br>
1. Private client ask private dns to resolve <a href="ftp://ftp.mycompany.net">ftp.mycompany.net</a><o:p></o:p></p>
<p class="MsoNormal">2. Private dns try to resolve it but the record is not present and generate an NXDOMAIN<o:p></o:p></p>
<p class="MsoNormal">3. “someone?” intercept this NXDOMAIN and forward the same request to the public dns<o:p></o:p></p>
<p class="MsoNormal">4. private client get the answer<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If this is possible, maybe with lua, I can add to the zone in the private dns only records that overrides the public ones, without to manage full zone on both dns.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Someone have some suggestions?<br>
<br>
Hope my request is clear!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks to all<o:p></o:p></p>
<p class="MsoNormal">Simone<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT">----------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";color:black;mso-fareast-language:IT">Simone Beccato</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";color:black;mso-fareast-language:IT"> </span></b><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT">Cloud Architect</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:IT"><img border="0" width="72" height="16" style="width:.75in;height:.1666in" id="Immagine_x0020_3" src="cid:image001.png@01D6FAF9.6C998750"></span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Barlow Condensed";color:black;mso-fareast-language:IT">Via del Bosco Rinnovato, 8</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Barlow Condensed";color:black;mso-fareast-language:IT">20090 Assago (MI)</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:IT"><a href="http://www.it.net/"><span lang="EN-US" style="font-size:10.0pt;font-family:"Barlow Condensed";color:#0070C0">ITnet</span></a></span><span style="font-size:10.0pt;font-family:"Barlow Condensed";color:#0070C0;mso-fareast-language:IT">
</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT">|<b><span style="color:#0070C0">
</span></b></span><span style="mso-fareast-language:IT"><a href="https://www.linkedin.com/company/itnet-srl" target="_blank" title="LinkedIn"><span style="font-size:10.0pt;font-family:"Barlow Condensed";color:#0070C0;border:none windowtext 1.0pt;padding:0cm;background:white">LinkedIn</span></a>
</span><span style="font-size:10.0pt;font-family:"Barlow Condensed";mso-fareast-language:IT">|<b><span style="color:#0070C0">
</span></b></span><span style="mso-fareast-language:IT"><a href="http://www.otmtinvestments.com/ITnet.html"><span style="font-size:10.0pt;font-family:"Barlow Condensed";border:none windowtext 1.0pt;padding:0cm">Group</span></a></span><span style="font-size:10.0pt;font-family:"Barlow Condensed""><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>