Install radvd and configure routing

apt-get install radvd

systemctl enable radvd
systemctl start radvd

vim /etc/radvd.conf

interface enp2s0
        {
        MinRtrAdvInterval 3;
        MaxRtrAdvInterval 4;
        AdvSendAdvert on;
        AdvManagedFlag off;
        prefix 2401:ed80:1000:7::/64
                {
                AdvValidLifetime 14300;
                AdvPreferredLifetime 14200;
                };
        RDNSS 2401:ed80:1000:7::1 {
                };
        };


systemctl restart radvd

sysctl -w net.ipv4.conf.all.forwarding=1
sysctl -w net.ipv6.conf.all.forwarding=1