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IPv6 Passthrough behind CGNAT: Can I access the local network from the Internet with the Public iPv6 address?

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Logi

Senior Member
Using TMHI (T-Mobile Home Internet), therefore no Public IPv4 due to CGNAT, but I have enabled in the router (AX88U) IPv6 Passthrough and it is working fine, I have checked with https://test-ipv6.com and everything works.

Can I leverage the Public IPv6 address to access the Local LAN from the internet with VPN? I don't know if the VPN solutions embedded in the AX88U are locked to IPv4 only?

Thanks
 
T-Mo filters all inbound connections over IPv6, and IPv4 is link-local via their IPv6 translation layer...

That being said - you could do a VPN over to an external service running a VPS, and then tunnel from there...
 
On windows devices, run these commands in elevated cmd

Code:
netsh interface ipv6 set global randomizeidentifiers=disabled
netsh interface ipv6 set privacy state=disabled

  • This will disable Windows 10/11 temp IP assignment.
  • Reboot your PC
  • After reboot, note your IPv6 from settings app
  • Add that static IPv6 to Asus Router's Firewall IPv6 section and the port you are trying to access. Eg. Remote Desktop uses 3389 port.
  • This way, you can access that particular PC directly without VPN.
 
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