root@ap# sysctl -w net.ipv6.conf.eth0.disable_ipv6=1
root@ap# sysctl -w net.ipv6.conf.br-lan.disable_ipv6=1
root@ap# sysctl -w net.ipv6.conf.wlan0.disable_ipv6=1
root@ap# vi /etc/sysctl.conf