Hey,
in Germany, providers often use the CG-NAT / IPv6-PD. The router can send and receive packages via the IPv6 connection.
However, the gateway on the router is not available on network.
Only the IPv4-gateway is usable.
I will only use IPv4 for the LAN-devices.
Sometimes one of the two providers only provide a IPv6-address. So I have to reconnect my modem a few times with Watchcat to get reconnected to the internet with valide IPv4- and IPv6-addresses at the same time.
IPv6 is only available on the OpenWRT-router for ping and the most other stuff.
How the IPv6-gateway will be possible to declare in OpenWRT-router by default?
Network > Interfaces > Interfaces
Note the "ipv6-PD: /64" in your screenshot on the WAN interface.
this means your OpenWRT router gets a single prefix, which is the smallest possible standard-allowed ipv6 subnet.
Such a /64 subnet cannot be subdivided into smaller subnets, which means, the LAN interface cannot be assigned a (smaller) subnet from this range and therefore cannot hand out routable ipv6 addresses to LAN clients.
According to your experience, sometimes it works. Probably sometimes your provider hands out a /56 or /60 or /62 prefix to your router. Then LAN can obtain a subnet for handing out routable ipv6 addresses.
is there a workaround on OpenWRT to set a virtual device as a gateway?
Is this the right place where to change the settings for IPv6 for the mobile-GW-device?
Network > Interfaces > Interface > gw_{ PROVIDER_NAME} > Advanced Settings
what this setting is for: if the provider offers you a larger prefix, you can choose to request a smaller prefix, but you cannot exceed the size that the provider offers.
