@levieuxatorange y a-t-il une limit de lease dhcp sur ipv6 ? J'ai fais pas mal de test en IPV4+IPV6 sur systemd/networkd et après un certain temps, je ne parviens plus a obtenir une IPV6.
Je suis retourné sur mon setup qui était fonctionnel, mais pas d'ipv6 et le client DHCP m'indique que le serveur DHCP ne veut pas me donner de prefix.

Listening on Socket/vlan832
Sending on   Socket/vlan832
PRC: Soliciting for leases (INIT).
XMT: Forming Solicit, 0 ms elapsed.
XMT:  X-- IA_PD xx:xx:xx:xx
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on vlan832, interval 1050ms.
RCV: Advertise message on vlan832 from fe80::ba0:bab.
RCV:  X-- IA_PD xx:xx:xx:xx
RCV:  | X-- starts 1755945603
RCV:  | X-- t1 - renew  +0
RCV:  | X-- t2 - rebind +0
RCV:  | X-- [Options]
RCV:  | !-- Status code of no prefix, IA_PD discarded.
RCV:  X-- Server ID: 00:03:00:xx:xx:xx:xx:xx:xx:xx
PRC: Lease failed to satisfy.
XMT: Forming Solicit, 1050 ms elapsed.
XMT:  X-- IA_PD xx:xx:xx:xx
XMT:  | X-- Request renew in  +3600
XMT:  | X-- Request rebind in +5400
XMT: Solicit on vlan832, interval 2020ms.
RCV: Advertise message on vlan832 from fe80::ba0:bab.
RCV:  X-- IA_PD xx:xx:xx:xx
RCV:  | X-- starts 1755945604
RCV:  | X-- t1 - renew  +0
RCV:  | X-- t2 - rebind +0
RCV:  | X-- [Options]
RCV:  | !-- Status code of no prefix, IA_PD discarded.
RCV:  X-- Server ID: 00:03:00:xx:xx:xx:xx:xx:xx:xx
PRC: Lease failed to satisfy.