kazulog@sv1:~$ sudo ip -6 addr flush dev ens3 scope global
kazulog@sv1:~$ sudo cp /tmp/60-ens3-ra.yaml /etc/netplan/60-ens3.yaml && sudo chmod 600 /etc/netplan/60-ens3.yaml
kazulog@sv1:~$ sudo netplan apply
kazulog@sv1:~$ ip -6 a show ens3
3: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    altname enp0s3
    altname enx525400ba7498
    inet6 2001:db8:100:0:5054:ff:feba:7498/64 scope global dynamic mngtmpaddr noprefixroute 
       valid_lft 2591995sec preferred_lft 604795sec
    inet6 fe80::5054:ff:feba:7498/64 scope link proto kernel_ll 
       valid_lft forever preferred_lft forever
kazulog@sv1:~$ ip -6 route show dev ens3
2001:db8:100::/64 proto ra metric 1024 expires 2591994sec pref medium
fe80::/64 proto kernel metric 256 pref medium
default nhid 3108948397 via fe80::5054:ff:fe92:855c proto ra metric 1024 expires 1794sec pref medium
kazulog@sv1:~$ sysctl net.ipv6.conf.ens3.accept_ra
net.ipv6.conf.ens3.accept_ra = 0