Re: Question IPv6 & dhcpcd.conf
Daniel Cordey via gull <gull-04vmY7CpswVinyhjFObuvR+/[email protected]> Sat, 15 Nov 2025 11:29:16 +0100
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Le 15/11/2025 à 07:25, thomas.portmann--- via gull a écrit :
> DHCPv6 REPLY: UnspecFail
Je n'ai pas de quoi tester, ni n'utilise de IPV6 avec mon fournisseur.
Voici quelques pistes trouvées sur le net. Idéalement, il faudrait
pouvoir accéder aux logs du serveur DHCP... Perso, je penche plus pour
un problème côté serveur que client. A moins que le driver du NIC ne
soit pas le bon.
dc
A "DHCPv6 REPLY: UnspecFail" error meansthe DHCPv6 server sent a reply
to a client's request but indicated a "unspecified failure," which is a
general error message for an unknown or unhandled problem. This can
happen for various reasons, such as a conflict in the lease process, a
configuration issue on the server, or the client sending a malformed
request.
Common causes
* *Lease conflict:*A client might receive this error if it sends a
DHCPv6 request shortly after a release, but the server hasn't yet
recognized the lease as available again.
* *Configuration issues:*The DHCPv6 server might have a
misconfiguration, leading it to fail on the request for an
unspecified reason.
* *Incorrect request from the client:*The client might be sending an
invalid or malformed request to the server, which the server doesn't
understand.
* *Server-side resource issues:*The server might have a limit on the
number of addresses it can lease, or it could be unable to complete
the request for other internal reasons.
How to troubleshoot
1. *Check server and client logs:*Look for more detailed error messages
in the DHCPv6 server logs and the client's logs for clues about what
went wrong.
2. *Restart the client:*A simple restart of the device trying to get an
IPv6 address can often resolve temporary glitches in the communication.
3. *Check the DHCPv6 server configuration:*Verify the IPv6 address
pool, address prefixes, and other options are correctly configured.
4. *Analyze the timing of requests:*If you're seeing this error
repeatedly, investigate the timing of the DHCPv6 messages to see if
the client is sending requests too quickly after a lease release.
5. *Contact your ISP:*If the problem persists, contact your Internet
Service Provider (ISP), as the issue may be with their DHCPv6 server
or network configuration
--
-----------------
*Daniel Cordey*
/Spain : +34 623 517 666
Andorra : +376 692 550 /
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<div class="moz-cite-prefix">Le 15/11/2025 à 07:25,
thomas.portmann--- via gull a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:166faedb-a5cb-48a6-aba0-1394f34994a4-5KQwm+K1IxyWGBtfGE7kq0EOCMrvLtNR@public.gmane.org">
<pre class="moz-quote-pre" wrap="">DHCPv6 REPLY: UnspecFail</pre>
</blockquote>
<p>Je n'ai pas de quoi tester, ni n'utilise de IPV6 avec mon
fournisseur. Voici quelques pistes trouvées sur le net.
Idéalement, il faudrait pouvoir accéder aux logs du serveur
DHCP... Perso, je penche plus pour un problème côté serveur que
client. A moins que le driver du NIC ne soit pas le bon.</p>
<p>dc</p>
<p><br>
</p>
<div class="Y3BBE" data-sfc-cp="" data-hveid="CAEQAA"
data-processed="true"
style="font-family: "Google Sans", Roboto, Arial, sans-serif; font-size: 16px; line-height: 24px; overflow-wrap: break-word; margin: 0px 0px 20px; color: rgb(10, 10, 10); font-weight: 400; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">A
"DHCPv6 REPLY: UnspecFail" error means<span> </span><mark
class="HxTRcb" data-processed="true"
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DHCPv6 server sent a reply to a client's request but indicated a
"unspecified failure," which is a general error message for an
unknown or unhandled problem</mark>. This can happen for various
reasons, such as a conflict in the lease process, a configuration
issue on the server, or the client sending a malformed request.<span
class="uJ19be notranslate"
data-wiz-uids="fOekld_c,fOekld_d,fOekld_e" data-processed="true"><span
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style="color: rgb(0, 29, 53); display: inline-block; transform: rotate(135deg);"><svg
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xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path
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<div class="Fsg96" data-sfc-cp="" data-processed="true"
style="color: rgb(10, 10, 10); font-family: "Google Sans", Roboto, Arial, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"></div>
<div class="otQkpb" aria-level="3" role="heading"
data-animation-nesting="" data-sfc-cp="" data-processed="true"
style="color: rgb(10, 10, 10); font-family: "Google Sans", Roboto, Arial, sans-serif; font-size: 20px; line-height: 28px; font-weight: 600; margin: 20px 0px 10px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">Common
causes<span class="txxDge notranslate"
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data-ved="2ahUKEwjJ6aGC-POQAxXZ8LsIHRfWKrYQye0OegQIAhAA"
data-processed="true"
style="margin: 0px 6px 0px 0px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(229, 237, 255); border: none; border-radius: 10px; height: 20px; padding: 0px; width: 28px; position: relative; outline: 0px; cursor: pointer;"><span
class="wiMplc ofC0Ud" data-processed="true"
style="color: rgb(0, 29, 53); display: inline-block; transform: rotate(135deg);"><svg
style="margin-top: 3px;" fill="currentColor"
width="12px" height="12px"
xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path
d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"></path></svg></span></button></span></span></div>
<ul class="KsbFXc U6u95" data-processed="true"
style="margin: 10px 0px 20px; padding: 0px; font-family: "Google Sans", Roboto, Arial, sans-serif; font-size: 16px; line-height: 24px; padding-inline-start: 16px; color: rgb(10, 10, 10); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">
<li data-hveid="CAMQAA" data-processed="true"
style="margin: 0px 0px 12px; padding: 0px; list-style: disc; padding-inline-start: 4px;"><span
class="T286Pc" data-sfc-cp="" data-processed="true"
style="overflow-wrap: break-word;"><strong class="Yjhzub"
data-processed="true" style="font-weight: bolder;">Lease
conflict:</strong><span> </span>A client might receive this
error if it sends a DHCPv6 request shortly after a release,
but the server hasn't yet recognized the lease as available
again.</span></li>
<li data-hveid="CAMQAQ" data-processed="true"
style="margin: 0px 0px 12px; padding: 0px; list-style: disc; padding-inline-start: 4px;"><span
class="T286Pc" data-sfc-cp="" data-processed="true"
style="overflow-wrap: break-word;"><strong class="Yjhzub"
data-processed="true" style="font-weight: bolder;">Configuration
issues:</strong><span> </span>The DHCPv6 server might have a
misconfiguration, leading it to fail on the request for an
unspecified reason.</span></li>
<li data-hveid="CAMQAg" data-processed="true"
style="margin: 0px 0px 12px; padding: 0px; list-style: disc; padding-inline-start: 4px;"><span
class="T286Pc" data-sfc-cp="" data-processed="true"
style="overflow-wrap: break-word;"><strong class="Yjhzub"
data-processed="true" style="font-weight: bolder;">Incorrect
request from the client:</strong><span> </span>The client
might be sending an invalid or malformed request to the
server, which the server doesn't understand.</span></li>
<li data-hveid="CAMQAw" data-processed="true"
style="margin: 0px 0px 12px; padding: 0px; list-style: disc; padding-inline-start: 4px;"><span
class="T286Pc" data-sfc-cp="" data-processed="true"
style="overflow-wrap: break-word;"><strong class="Yjhzub"
data-processed="true" style="font-weight: bolder;">Server-side
resource issues:</strong><span> </span>The server might have
a limit on the number of addresses it can lease, or it could
be unable to complete the request for other internal reasons.</span><span
class="uJ19be notranslate"
data-wiz-uids="fOekld_10,fOekld_11,fOekld_12"
data-processed="true"><span class="vKEkVd"
data-animation-atomic="" data-processed="true"
style="white-space: nowrap; position: relative;"> <button
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data-processed="true"
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style="color: rgb(0, 29, 53); display: inline-block; transform: rotate(135deg);"><svg
style="margin-top: 3px;" fill="currentColor"
width="12px" height="12px"
xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path
d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"></path></svg></span></button></span></span></li>
</ul>
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<div class="otQkpb" aria-level="3" role="heading"
data-animation-nesting="" data-sfc-cp="" data-processed="true"
style="color: rgb(10, 10, 10); font-family: "Google Sans", Roboto, Arial, sans-serif; font-size: 20px; line-height: 28px; font-weight: 600; margin: 20px 0px 10px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">How
to troubleshoot<span class="txxDge notranslate"
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data-wiz-attrbind="disabled=fOekld_17_C5gNJc;class=fOekld_17_UpSNec;"
data-ved="2ahUKEwjJ6aGC-POQAxXZ8LsIHRfWKrYQye0OegQIBBAA"
data-processed="true"
style="margin: 0px 6px 0px 0px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(229, 237, 255); border: none; border-radius: 10px; height: 20px; padding: 0px; width: 28px; position: relative; outline: 0px; cursor: pointer;"><span
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style="color: rgb(0, 29, 53); display: inline-block; transform: rotate(135deg);"><svg
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width="12px" height="12px"
xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path
d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"></path></svg></span></button></span></span></div>
<ol class="IaGLZe VimKh" data-processed="true"
style="margin: 10px 0px 20px; padding: 0px; font-family: "Google Sans", Roboto, Arial, sans-serif; font-size: 16px; line-height: 24px; padding-inline-start: 20px; color: rgb(10, 10, 10); font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">
<li data-hveid="CAYQAA" data-processed="true"
style="margin: 0px 0px 12px; padding: 0px; list-style: decimal; padding-inline-start: 0px;"><span
class="T286Pc" data-sfc-cp="" data-processed="true"
style="overflow-wrap: break-word;"><strong class="Yjhzub"
data-processed="true" style="font-weight: bolder;">Check
server and client logs:</strong><span> </span>Look for more
detailed error messages in the DHCPv6 server logs and the
client's logs for clues about what went wrong.</span></li>
<li data-hveid="CAYQAQ" data-processed="true"
style="margin: 0px 0px 12px; padding: 0px; list-style: decimal; padding-inline-start: 0px;"><span
class="T286Pc" data-sfc-cp="" data-processed="true"
style="overflow-wrap: break-word;"><strong class="Yjhzub"
data-processed="true" style="font-weight: bolder;">Restart
the client:</strong><span> </span>A simple restart of the
device trying to get an IPv6 address can often resolve
temporary glitches in the communication.</span></li>
<li data-hveid="CAYQAg" data-processed="true"
style="margin: 0px 0px 12px; padding: 0px; list-style: decimal; padding-inline-start: 0px;"><span
class="T286Pc" data-sfc-cp="" data-processed="true"
style="overflow-wrap: break-word;"><strong class="Yjhzub"
data-processed="true" style="font-weight: bolder;">Check the
DHCPv6 server configuration:</strong><span> </span>Verify
the IPv6 address pool, address prefixes, and other options are
correctly configured.</span></li>
<li data-hveid="CAYQAw" data-processed="true"
style="margin: 0px 0px 12px; padding: 0px; list-style: decimal; padding-inline-start: 0px;"><span
class="T286Pc" data-sfc-cp="" data-processed="true"
style="overflow-wrap: break-word;"><strong class="Yjhzub"
data-processed="true" style="font-weight: bolder;">Analyze
the timing of requests:</strong><span> </span>If you're
seeing this error repeatedly, investigate the timing of the
DHCPv6 messages to see if the client is sending requests too
quickly after a lease release.</span></li>
<li data-hveid="CAYQBA" data-processed="true"
style="margin: 0px 0px 12px; padding: 0px; list-style: decimal; padding-inline-start: 0px;"><span
class="T286Pc" data-sfc-cp="" data-processed="true"
style="overflow-wrap: break-word;"><strong class="Yjhzub"
data-processed="true" style="font-weight: bolder;">Contact
your ISP:</strong><span> </span>If the problem persists,
contact your Internet Service Provider (ISP), as the issue may
be with their DHCPv6 server or network configuration</span></li>
</ol>
<p><br>
</p>
<p><br>
</p>
<div class="moz-signature">-- <br>
<p>-----------------
<br>
<b>Daniel Cordey</b>
<br>
<i>Spain : +34 623 517 666
<br>
Andorra : +376 692 550
</i></p>
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