No IPv6 on Broadband Connect (PPPoE DHCPv6-PD), while LAN IPv6 is OK (i-040gw get from PPPoE DHCPv6-PD, and offer SLAAC+DHCP statless+RDNSS)

fierycloud

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Hello:
No IPv6 on Broadband Connect (PPPoE DHCPv6-PD), while LAN IPv6 is OK (i-040gw get 2 prefix (one for CPE use, one for lan use) from PPPoE DHCPv6-PD (Wan1 PPPoE Vlan 4082) (The CPE also has 3 WAN interface. The other 2 are the Wan3 PPPoE pass through Vlan 4082, and Wan2 IPoE Vlan 4081), and offer SLAAC+DHCP statless+RDNSS)
The other 2 PCs connect to the same CPE(Alcatel i-040gw) on Window 10 21H1 are OK (Though the PPPoE DHCPv6-PD IPv6 address have a static suffix, only prefix changes on every Broadband Dial up).
But the PC which is tricked (Bypass TPM and Secure Boot) to install the Windows 11 has no default IPv6 gateway, no IPv6 dns, no IPv6 global address (Link-local one only). (IPv4 is OK PPPoE and LAN on 3 PCs) The detail window of the Broadband connect shows the server IPv6 address which should be the default gateway. (It's just the same as the PPPOE WAN default gateway in the CPE. So the PPPOE router advertisement should work, but the PC doesn't set it as the default gateway.)
The DHCPv6 client log shows that the M flag changes or something in the LAN interface just as while the PC was on windows 10, and there is a little on the ppp interface.

Or there are RA from the CPE(From PPPoE) to LAN and the one from Windows PPPoE interact with each other? How could I make them apart?
Does Windows 11 have an familiar problem just as the Windows 1607? did? (It seems used to open ICMPv6 133-137 all address inbound and outbound at that time.) (And it seems used to be that some firewall (Comodo did, but not the zonealarm) will block the RA from one, and prevent the default gate way missing or something.) I tried to open the ICMPv6, but still no IPv6 in the PPPoE.
Tried closing the system firewall to make sure the DHCPv6 and router advertisement not blocked, but no difference.

If the problem caused by the vlan tag needed by the ISP? It seems to be a old problem from windows 7 according to some sites. The Windows listen to tagged and untagged packets.

By the way, trying to used the PPPOE IPV4 and LAN IPv6 at the same time, while just unchecking disable the using remote gateway in the IPv6 in the PPPOE Broadband adapter. And it's really strange that the ipv6-test site show there are no icmpv6 filter (Score 20) while using the method.

Thanks
 
Windows Build/Version
22000.258
Last edited:

My Computer

System One

  • Operating System
    Windows 11 22000.194
    Computer type
    PC/Desktop

sparefly

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Interesting though, I'm facing the same problem too when trying to connect using a PPPoE connection on a freshly upgraded Windows 11 machine (no bypass), only got IPv4 but no IPv6 address except for a link local one. My other laptop which is still running on Windows 10 (21H1) works fine as well as the CPE and routers that used a direct PPPoE connection. All of them got public IPv6 without a problem so I doubt this is problem on the ISP's side. I'm staring to think if any network-related OS settings could have changed since the upgrade.
 

My Computer

System One

  • Operating System
    Windows 11 21H2
    Computer type
    Laptop
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