[gull] Question IPv6 & dhcpcd.conf

[Daniel Cordey]

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 /
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://forum.linux-gull.ch/pipermail/gull/attachments/20251115/55108519/attachment-0001.html>