On 2023-04-18 09:02, Carlos E. R. wrote:

See if you can configure Unique Local Addresses (ULA). Those are the IPv6 equivalent of RFC 1918 addresses on IPv4. Even if your router doesn't support it, you should be able to configure openSUSE to provide them.

Do you know of a help text on that?

I haven't done that on openSUSE, but I have on my pfSense firewall. Here's the info.
https://forum.netgate.com/topic/163161/using-unique-local-addresses?_=1621521617928

When I was using openSUSE for my firewall/router, I was using a tunnel and it provided SLAAC to my network. I had to move to pfSense when my ISP started providing native IPv6, as openSUSE didn't support DHCPv6-PD, which is what provides the prefix to my network. To enable ULA, you'd have to configure openSUSE with a static prefix within the ULA range.

I used a 6in4 tunnel for almost 6 years and native IPv6 for over 7.