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Thanks.
<div class="">I have tried append prepend and supersede option. They are ok for ipv4 name server. But It doesn’t work for ipv6 name server.
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<div class="">Zhengyu<br class="">
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<div class="">2019年12月19日 下午6:16，Philippe Maechler <<a href="mailto:pmaechler-ml@glattnet.ch" class="">pmaechler-ml@glattnet.ch</a>> 写道：</div>
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<span lang="EN-GB" style="font-size: 12pt;" class="">Hi Zhengyu Pan<o:p class=""></o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt;" class=""><o:p class=""> </o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt;" class="">Have you tried to put this nameserver address in dhclient.conf?<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt;" class=""><o:p class=""> </o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt;" class="">From man dhclient.conf<o:p class=""></o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt; font-family: "Courier New";" class=""> append { [option declaration] [, ... option declaration] }<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-GB" style="font-size: 12pt; font-family: "Courier New";" class=""> If for some set of options the client should first use the values<o:p class=""></o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt; font-family: "Courier New";" class=""> supplied by the server, if any, and then use values you supply,<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-GB" style="font-size: 12pt; font-family: "Courier New";" class=""> these values can be defined in the append statement. The append<o:p class=""></o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt; font-family: "Courier New";" class=""> statement can only be used for options which allow more than one<o:p class=""></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span lang="EN-GB" style="font-size: 12pt; font-family: "Courier New";" class=""> value to be given. This restriction is not enforced - if you<o:p class=""></o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt; font-family: "Courier New";" class=""> ignore it, the behaviour will be unpredictable.<o:p class=""></o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt;" class=""><o:p class=""> </o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt;" class="">I haven’t use the ap- or prepend options, but the supersede option work like a charm (at least on FreeBSD)<o:p class=""></o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt;" class=""><o:p class=""> </o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt;" class="">/BR<o:p class=""></o:p></span></div>
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<span lang="EN-GB" style="font-size: 12pt;" class="">Philippe<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""><o:p class=""> </o:p></span></div>
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<b class=""><span lang="EN-GB" class="">From:</span></b><span lang="EN-GB" class=""><span class="Apple-converted-space"> </span>bind-users <<a href="mailto:bind-users-bounces@lists.isc.org" class="">bind-users-bounces@lists.isc.org</a>><span class="Apple-converted-space"> </span><b class="">On
Behalf Of<span class="Apple-converted-space"> </span></b>Zhengyu Pan(???????????????)<br class="">
</span><b class=""><span lang="DE" class="">Sent:</span></b><span lang="DE" class=""><span class="Apple-converted-space"> </span>Thursday, December 19, 2019 10:01 AM<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span><a href="mailto:bind-users@lists.isc.org" class="">bind-users@lists.isc.org</a><br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>dhclient hook not overwritten /etc/resolv.conf<o:p class=""></o:p></span></div>
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<o:p class=""> </o:p></div>
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<span class="crayon-i"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm; background-color: rgb(252, 252, 252); background-position: initial initial; background-repeat: initial initial;" class="">Hi,</span></span><o:p class=""></o:p></div>
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<span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm; background-color: rgb(252, 252, 252); background-position: initial initial; background-repeat: initial initial;" class=""><br class="">
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</span><o:p class=""></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="crayon-i"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm; background-color: rgb(252, 252, 252); background-position: initial initial; background-repeat: initial initial;" class="">My OS is
Centos7. I add a bash script dns.sh in /etc/dhcp/dhclient-exit-hooks.d . The script content is</span></span><o:p class=""></o:p></div>
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<span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm; background-color: rgb(252, 252, 252); background-position: initial initial; background-repeat: initial initial;" class=""><br class="">
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</span><o:p class=""></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="crayon-i"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm; background-color: rgb(252, 252, 252); background-position: initial initial; background-repeat: initial initial;" class="">#!/bin/bash</span></span><o:p class=""></o:p></div>
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<span class="crayon-i"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">echo</span></span><span class="crayon-h"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class=""><span class="Apple-converted-space"> </span></span></span><span style="font-size: 10.5pt; font-family: "Courier New"; background-color: rgb(250, 250, 250); background-position: initial initial; background-repeat: initial initial;" class="">“</span><span class="crayon-i"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">nameserver</span></span><span class="crayon-h"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class=""><span class="Apple-converted-space"> </span></span></span><span class="crayon-cn"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">1.1.1.1</span></span><span style="font-size: 10.5pt; font-family: "Courier New"; background-color: rgb(250, 250, 250); background-position: initial initial; background-repeat: initial initial;" class="">”</span><span class="crayon-h"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class=""><span class="Apple-converted-space"> </span></span></span><span class="crayon-o"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">>></span></span><span class="crayon-h"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class=""><span class="Apple-converted-space"> </span></span></span><span class="crayon-o"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">/</span></span><span class="crayon-v"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">etc</span></span><span class="crayon-o"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">/</span></span><span class="crayon-v"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">resolv</span></span><span class="crayon-sy"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">.</span></span><span class="crayon-i"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">conf</span></span><o:p class=""></o:p></div>
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<span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class=""><br class="">
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</span><o:p class=""></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="crayon-i"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">I want to append a nameserver in /etc/resove.conf.</span></span><o:p class=""></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span class="crayon-i"><span style="font-size: 10.5pt; font-family: "Courier New"; border: 1pt none windowtext; padding: 0cm;" class="">However, when I restart network.<span class="Apple-converted-space"> </span></span></span><span style="font-size: 10.5pt; font-family: "Courier New"; color: rgb(34, 34, 34);" class="">/etc/resove.conf
not changed.</span><o:p class=""></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-size: 10.5pt; font-family: "Courier New"; color: rgb(34, 34, 34);" class="">/etc/resove.conf.save append this line. </span><o:p class=""></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-size: 10.5pt; font-family: "Courier New"; color: rgb(34, 34, 34);" class="">Why happens that? How can I append a nameserver in /etc/resove.conf?</span><o:p class=""></o:p></div>
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<span style="font-size: 10.5pt; font-family: "Courier New"; color: rgb(34, 34, 34);" class=""><br class="">
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</span><o:p class=""></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-size: 10.5pt; font-family: "Courier New"; color: rgb(34, 34, 34);" class="">Zhengyu</span><o:p class=""></o:p></div>
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<span style="font-size: 10.5pt; font-family: "Courier New"; color: rgb(34, 34, 34);" class="">Best Wishes</span><o:p class=""></o:p></div>
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