Je parlais d'une capture de l'interface WAN de ton routeur seul, qui semble marcher en v6.
Ai-je mal compris la situation ?
dans les 2 cas j'ai une réponse du DHCP orange, mais avec l'option 125 à 00010002010000000000
voici la réponse DHCPv4 décodée par wireshark, la réponse DHCPv6 est analogue, étonnement malgré l'option 125 en erreur j'ai tout de même bien un IA-PD en réponse en v6 (erreur de config ?)
Dynamic Host Configuration Protocol (ACK)
Message type: Boot Reply (2)
Hardware type: Ethernet (0x01)
Hardware address length: 6
Hops: 0
Transaction ID: 0xeefece62
Seconds elapsed: 0
Bootp flags: 0x0000 (Unicast)
Client IP address: 0.0.0.0
Your (client) IP address: 172.16.207.54
Next server IP address: 80.10.235.169
Relay agent IP address: 80.10.235.169
Client MAC address: Sagemcom_xx:xx:xx (8c:10:d4:xx:xx:xx)
Client hardware address padding: 00000000000000000000
Server host name not given
Boot file name not given
Magic cookie: DHCP
Option: (53) DHCP Message Type (ACK)
Length: 1
DHCP: ACK (5)
Option: (54) DHCP Server Identifier (80.10.235.169)
Length: 4
DHCP Server Identifier: 80.10.235.169
Option: (51) IP Address Lease Time
Length: 4
IP Address Lease Time: (20000000s) 231 days, 11 hours, 33 minutes, 20 seconds
Option: (1) Subnet Mask (255.255.0.0)
Length: 4
Subnet Mask: 255.255.0.0
Option: (3) Router
Length: 4
Router: 172.16.0.1
Option: (28) Broadcast Address (172.16.255.255)
Length: 4
Broadcast Address: 172.16.255.255
Option: (6) Domain Name Server
Length: 8
Domain Name Server: 80.10.246.1
Domain Name Server: 81.253.149.9
Option: (61) Client identifier
Length: 17
Option: (90) Authentication
Length: 27
Protocol: configuration token (0)
Algorithm: 0
Replay Detection Method: Monotonically-increasing counter (0)
RDM Replay Detection Value: 0x0000000000000000
Authentication Information: dhcpliveboxfr250
Option: (125) V-I Vendor-specific Information
Length: 17
Enterprise: Orange (1368)
Length: 12
Option 125 Suboption: 1
Length: 10
Data: 00010002010000000000
Option: (119) Domain Search
Length: 34
FQDN: MSR.access.orange-multimedia.net
Option: (58) Renewal Time Value
Length: 4
Renewal Time Value: (2795019s) 32 days, 8 hours, 23 minutes, 39 seconds
Option: (59) Rebinding Time Value
Length: 4
Rebinding Time Value: (16000000s) 185 days, 4 hours, 26 minutes, 40 seconds
Option: (255) End
Option End: 255