It appears that Cisco is well aware of the mistake that they made, and the default has been changed to 192.0.2.1 which is a properly reserved address for this. I see recommendations to change this address dating back to 2010, so by now it should have been changed by most active admins, and if not it will not really break anything unless users are using hardwired DNS settings and use the new 1.1.1.1 service. However, in wireless systems like this, users will likely use DHCP to set their DNS resolvers, and it will work at least until the admin changes the DNS advertised via DHCP and does not realize that 1.1.1.1 is already in use in their own system. I tried reaching the 1.1.1.1 DNS service via 4 different ISPs here in the Netherlands and it works OK on all of them. Apparently the use of 1.1.1.1 in routers is not too big of an issue. Rob