Which address space is excluded in Tunnel 2.0 configurations?

In Tunnel 2.0 configurations, the RFC 1918 address space is specifically excluded. This is because RFC 1918 defines private IP address ranges that are not routable on the public internet. The reason for excluding this address space is that those addresses are typically used within internal networks and are meant to facilitate private communication. By excluding them, the configuration ensures that the tunnel is only dealing with public IP addresses, which are routable and suitable for external internet communication.

Options that refer to public IP address space, local address space, or the entire IPv6 address range do not fit the context of Tunnel 2.0's intent to filter out private addressing that would otherwise be misrouted over the tunnel. Therefore, understanding the necessity of excluding RFC 1918 addresses helps to streamline internet traffic management and security in a digital transformation context.