test-ipv6.com indique une note de 10/10, malgré le tunnel. Le contenu d'un des paquets IPv6 entre la box et l'ONT :
No. Time Source Destination Protocol Length Info
827 9.870598000 2607:f740:0:3f::f2f 2a02:8428:87:xx00:4c:18ce:3e80:304f TCP 1507 [TCP segment of a reassembled PDU]
Frame 827: 1507 bytes on wire (12056 bits), 1507 bytes captured (12056 bits) on interface 0
Ethernet II, Src: Ericsson_19:9d:c7 (00:30:88:19:9d:c7), Dst: Sfr_73:5e:xx (24:95:04:73:5e:xx)
Destination: Sfr_73:5e:xx (24:95:04:73:5e:xx)
Source: Ericsson_19:9d:c7 (00:30:88:19:9d:c7)
Type: IP (0x0800)
Internet Protocol Version 4, Src: 109.6.4.109 (109.6.4.109), Dst: 93.31.227.xx (93.31.227.xx)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00: Not-ECT (Not ECN-Capable Transport))
Total Length: 1493
Identification: 0x3530 (13616)
Flags: 0x00
Fragment offset: 0
Time to live: 250
Protocol: UDP (17)
Header checksum: 0xd41b [correct]
Source: 109.6.4.109 (109.6.4.109)
Destination: 93.31.227.xx (93.31.227.xx)
[Source GeoIP: Unknown]
[Destination GeoIP: Unknown]
User Datagram Protocol, Src Port: l2f (1701), Dst Port: l2f (1701)
Source port: l2f (1701)
Destination port: l2f (1701)
Length: 1473
Checksum: 0x0000 (none)
Layer 2 Tunneling Protocol
Packet Type: Data Message Tunnel Id=62227 Session Id=4864
Tunnel ID: 62227
Session ID: 4864
Offset: 0
Point-to-Point Protocol
Address: 0xff
Control: 0x03
Protocol: Internet Protocol version 6 (0x0057)
Internet Protocol Version 6, Src: 2607:f740:0:3f::f2f (2607:f740:0:3f::f2f), Dst: 2a02:8428:87:xx00:4c:18ce:3e80:304f (2a02:8428:87:xx00:4c:18ce:3e80:304f)
0110 .... = Version: 6
.... 0000 0000 .... .... .... .... .... = Traffic class: 0x00000000
.... .... .... 0000 0000 0000 0000 0000 = Flowlabel: 0x00000000
Payload length: 1413
Next header: TCP (6)
Hop limit: 56
Source: 2607:f740:0:3f::f2f (2607:f740:0:3f::f2f)
Destination: 2a02:8428:87:xx00:4c:18ce:3e80:304f (2a02:8428:87:xx00:4c:18ce:3e80:304f)
[Source GeoIP: Unknown]
[Destination GeoIP: Unknown]
Transmission Control Protocol, Src Port: http (80), Dst Port: 44162 (44162), Seq: 1, Ack: 403, Len: 1381