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Sophos DDNS with NATed public IP

Casual_User

I have setup my XG firewall to use the Sophos DDNS service with the NATed public IP option selected since my ISP shares the public IPv4 address with a number of clients.  The Sophos service works fine.  It accurately detects the NATed public IPv4.  The downside is that it appears to also select the "public" IPv6 too, which points to the wrong IPv6 address.  So I have the OpenVPN config file point to my domain for UDP4 and to the IPv6 address I specify for IPv6.

I have setup the DDNS service to access my home network via OpenVPN.  I can connect to my home VPN via IPv6 (since the public IPv6 address is not NATed).  The downside to this is that this requires the WiFi network that I connect to to be dual stack.  Most of which are not.

My ISP informs me that the router they have given me (and that they alone have access to) is running in bridged mode.  The router also provides TV service to our house.  So the ISP will not give me any access to the device.

I know that TeamViewer will be able to get through the double NAT, but that is not the direction I want to go in...

Am I stuck with the IPv6 VPN only?  



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  • 0

    Hi,

    I am missing something, suddenly in the middle wifi dual stack appears. What is the AP and how is it connected to the XG? If it is a Sophos AP it will perform dual stack, but the device itself will only have an IP4 address.

    You will need to have IPv6 rules in your XG and the IPv6 traffic is NATted.

    Ian

  • 0 in reply to rfcat_vk

    Hi Ian,

    You misunderstand the issue.  My home WiFi is fine.  I don't VPN through my home WiFi.  The issue is using "public" WiFi like at hotels or airports.  I cannot connect via IPv4 through VPN at those locations since they do not typically run a dual stack.  So, I'm looking for a way to get the IPv4 VPN connection working through the double NAT that my ISP has set up.

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  • 0 in reply to rfcat_vk

    Hi Ian,

    You misunderstand the issue.  My home WiFi is fine.  I don't VPN through my home WiFi.  The issue is using "public" WiFi like at hotels or airports.  I cannot connect via IPv4 through VPN at those locations since they do not typically run a dual stack.  So, I'm looking for a way to get the IPv4 VPN connection working through the double NAT that my ISP has set up.

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