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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Nunito Sans""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am reaching out regarding the use of EDNS Client Subnet (ECS) in BIND.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Context:<br>
I am testing an environment where:<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l0 level1 lfo1"><span lang="EN-US">A dnsdist server receives client queries and injects a specific ECS (e.g., 41.226.22.0/24).<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l0 level1 lfo1"><span lang="EN-US">These queries are then forwarded to a BIND 9.18-S1 server configured as the final resolver.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US">Issue:<br>
BIND does not forward the ECS to upstream servers and does not preserve this information in responses.<o:p></o:p></span></p>
<p class="MsoNormal">Questions:<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l1 level1 lfo2"><span lang="EN-US">Can BIND 9.18-S1 be configured to rewrite or forward an ECS injected by dnsdist?<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo2"><span lang="EN-US">If not, which version or configuration would you recommend for BIND to meet this requirement?<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">Best regards Sami,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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