IPv6 with french Orange ISP

[vthinsel]

Hello !

As I changed my ISP to Orange, who doesn't offer IPv4 bridging but who offers ipV6 prefix delegation I started to implement IPv6 at home. I got some success for outbound connections: http://test-ipv6.com/ gives 10/10 and https://ipv6-test.com/ 15/20. In both tests I can see the IPv6 of my PC which sounds good.
Things get more complicated for incoming traffic. With https://tools.keycdn.com/ipv6-ping I'm able to ping only the IPV6 on the ISP box (2a01:cb1d:81cb:8200:8e19:b5ff:fe8a:c5e0).
Configuration details:
WAN
DHCPv6
Request only an IPv6 prefix: unchecked
Prefix delegation size: 64
Use IPv4 connectivity: unchecked
Send IPv6 prefix hint: checked

LAN
Track interface
IPv6 interface: WAN
IPv6 Prefix ID : 0
Allow manual adjustement of DHCPv6 and Router Advertisements: checked

Services/DHCPv6/LAN
Enable DHCPv6 server on LAN
Subnet   2a01:cb1d:81cb:82ec::
Subnet mask   64 bits
Current LAN IPv6 prefix   2a01:cb1d:81cb:82ec::
Available range   2a01:cb1d:81cb:82ec:: - 2a01:cb1d:81cb:82ec:ffff:ffff:ffff:ffff


Services/Router Advertisements/LAN
Router Advertisements: Managed

Note:I tried all other modes, too.

With those settings I end up with this:

WAN interface (wan, igb1)
Status   up
DHCP   up   Reload Release
MAC address   00:0d:b9:57:b7:b5 - PC Engines GmbH
MTU   1500
IPv4 address   192.168.1.10/24
IPv4 gateway   192.168.1.1
IPv6 link-local   fe80::20d:b9ff:fe57:b7b5/64
IPv6 address   2a01:cb1d:81cb:8200:20d:b9ff:fe57:b7b5/64
IPv6 delegated prefix   2a01:cb1d:81cb:82ec::/64
IPv6 gateway   fe80::8e19:b5ff:fe8a:c5e0
DNS servers   192.168.1.1
   2a01:cb1d:81cb:8200:8e19:b5ff:fe8a:c5e0

LAN interface (lan, igb0)
Status   up
MAC address   00:0d:b9:57:b7:b4 - PC Engines GmbH
MTU   1500
IPv4 address   192.168.2.254/24
IPv6 link-local   fe80::20d:b9ff:fe57:b7b4/64
IPv6 address   2a01:cb1d:81cb:82ec:20d:b9ff:fe57:b7b4/64


I did a tcpdump also to see what IPv6 traffic was flowing (I added a temp floating rule to allow all IPv6 traffic, just incase).
I noticed ICMP RA from the ISP box:

Frame 10: 158 bytes on wire (1264 bits), 158 bytes captured (1264 bits)
Ethernet II, Src: Arcadyan_8a:c5:e0 (8c:19:b5:8a:c5:e0), Dst: IPv6mcast_01 (33:33:00:00:00:01)
Internet Protocol Version 6, Src: fe80::8e19:b5ff:fe8a:c5e0, Dst: ff02::1
Internet Control Message Protocol v6
    Type: Router Advertisement (134)
    Code: 0
    Checksum: 0x75cc [correct]
    [Checksum Status: Good]
    Cur hop limit: 64
    Flags: 0x48, Other configuration, Prf (Default Router Preference): High
    Router lifetime (s): 600
    Reachable time (ms): 0
    Retrans timer (ms): 0
    ICMPv6 Option (Prefix information : 2a01:cb1d:81cb:8200::/64)
    ICMPv6 Option (Recursive DNS Server 2a01:cb1d:81cb:8200:8e19:b5ff:fe8a:c5e0)
    ICMPv6 Option (DNS Search List Option home)
    ICMPv6 Option (MTU : 1500)
    ICMPv6 Option (Source link-layer address : 8c:19:b5:8a:c5:e0)

Anything else I should look at to ensure routing is fine ? I4ll probably contact my SIP too, but I'm not too optimistic with them providing good support.

Thanks for your time !