OpenVPN with IPv4 and IPv6

I’m creating a server with OpenVPN to mask my IP address using this [article]( -ubuntu-20-04-en) from DigitalOcean.

The setup worked perfectly when I configure Redirect All Traffic Through the VPN, all my accesses on sites with IPv4 display the Droplet’s IP.

The problem occurs when I access sites that accept IPv6, in these cases the displayed address is that of my ISP.

Below the line

net.ipv4.ip_forward = 1

I added the value

net.ipv6.conf.all.forwarding = 1

but nothing happened.

How do I also enable the use of the Droplet’s IPv6?

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