That’s honestly a pretty common frustration, and it usually comes down to how much control your ISP keeps over their equipment. When your WAN is set to DHCP, many providers lock DNS and IPv6 settings so they can manage the network consistently and reduce support issues on their end. It’s not ideal if you want flexibility, but from their perspective it avoids misconfigurations. If you want full control, the usual workaround is to use your own router behind theirs in bridge mode, assuming they allow it.     ... View more