WireGuard in CGNAT

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Manny Cavalier

• February 09, 2026 02:17

My ISP where my FWG is connected to is using CGNAT. Is there still a way to use WireGuard as my VPN server on this setup?

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  FirewallaSupportDesk

  • February 09, 2026 02:27

  Reference: Step 0: You need a public IP .
  If your ISP provides you global IPv6 addresses, you can change VPN server's DDNS to IPv6 Only, in order to connect. Firewalla DNS server uses DDNS (Dynamic DNS), which is a service that dynamically maps domain names to your public IP addresses. See our VPN Server article for more information on using IPv6. 

  Note: when it's IPv6 only on Firewalla VPN server's DDNS, the client device must have a public IPv6 address in order to connect. You can use website like https://www.whatsmyip.org or https://ipinfo.io to confirm if client device has public IPv6 address.

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  Manny Cavalier

  • February 09, 2026 05:06

  Unfortunately, my ISP doesn't support yet IPv6.

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