They are not alone. Avocent SVIP1020 a KVM-IP-switch works also without Dualstack - without IPv4 when IPv6 enabled and v.v. Regards, Thomas PS: yesterday avm published a new beta-firmware for fritzbox 7270, with DS- Lite added, and IPv6 und IPv4 in the "correct" order in some menus. (they also fixed some issues)