alpine:~ # cat /etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 145.129.86.78
netmask 255.255.255.0
gateway 145.129.86.1
iface eth0 inet6 static
address 2401:b60:1:602d:f83e:d781:f929:5679/64
gateway 2401:b60:1::1
pre-up echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra