Pour le moment je me limite a l'ipv4 histoire de limiter les soucis potentiel.

J'ai fait une capture de trame, aucune réponse au Discover, donc je suis ignoré.
Je vois bien le 802.1Q sur le vlan 832 et la COS à 6.

je vois une option 55 non paramétrée de mon coté mais ça me parait pas déconnant.
L'option 61, 77 et 90 sont ok.

Ethernet II, Src: SagemcomBroa_e9:a0:10 (2c:f2:a5:e9:a0:10), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
    Destination: Broadcast (ff:ff:ff:ff:ff:ff)
        .... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
        .... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
    Source: SagemcomBroa_xx:xx:xx (2c:f2:a5:xx:xx:xx)
        .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: 802.1Q Virtual LAN (0x8100)
    [Stream index: 3]
802.1Q Virtual LAN, PRI: 6, DEI: 0, ID: 832
    110. .... .... .... = Priority: Internetwork Control (6)
    ...0 .... .... .... = DEI: Ineligible
    .... 0011 0100 0000 = ID: 832
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 0.0.0.0, Dst: 255.255.255.255
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
    Total Length: 424
    Identification: 0x0000 (0)
    000. .... = Flags: 0x0
    ...0 0000 0000 0000 = Fragment Offset: 0
    Time to Live: 16
    Protocol: UDP (17)
    Header Checksum: 0xa946 [validation disabled]
    [Header checksum status: Unverified]
    Source Address: 0.0.0.0
    Destination Address: 255.255.255.255
    [Stream index: 1]
User Datagram Protocol, Src Port: 68, Dst Port: 67
Dynamic Host Configuration Protocol (Discover)
    Message type: Boot Request (1)
    Hardware type: Ethernet (0x01)
    Hardware address length: 6
    Hops: 0
    Transaction ID: 0x45d55e48
    Seconds elapsed: 60
    Bootp flags: 0x0000 (Unicast)
    Client IP address: 0.0.0.0
    Your (client) IP address: 0.0.0.0
    Next server IP address: 0.0.0.0
    Relay agent IP address: 0.0.0.0
    Client MAC address: SagemcomBroa_xx:xx:xx (2c:f2:a5: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 (Discover)
        Length: 1
        DHCP: Discover (1)
    Option: (55) Parameter Request List
        Length: 9
        Parameter Request List Item: (1) Subnet Mask
        Parameter Request List Item: (121) Classless Static Route
        Parameter Request List Item: (3) Router
        Parameter Request List Item: (33) Static Route
        Parameter Request List Item: (6) Domain Name Server
        Parameter Request List Item: (42) Network Time Protocol Servers
        Parameter Request List Item: (138) CAPWAP Access Controllers
        Parameter Request List Item: (43) Vendor-Specific Information
        Parameter Request List Item: (15) Domain Name
    Option: (60) Vendor class identifier
        Length: 5
        Vendor class identifier: sagem
    Option: (61) Client identifier
        Length: 7
        Hardware type: Ethernet (0x01)
        Client MAC address: SagemcomBroa_xx:xx:xx (2c:f2:a5:xx:xx:xx)
    Option: (77) User Class Information
        Length: 42
        User Class Data (Text): +FSVDSL_livebox.Internet.sagem.LiveboxPro3
    Option: (90) Authentication
        Length: 70
        Protocol: configuration token (0)
        Algorithm: 0
        Replay Detection Method: Monotonically-increasing counter (0)
        RDM Replay Detection Value: 0x0000000000000000
        Authentication Information: \x1A\t
    Option: (255) End
        Option End: 255

Par contre je vois que tu utilises des mangle et non les filtres, mais bon vu qu'à priori j'ai qd meme les bonnes valeurs..

Oui, ça fait la meme chose malheureusement