IPv6 additional addresses.

/etc/network/interfaces

iface eth0 inet6 static
address 2404:9400:213c:6b01:0000:0000:0000:0001/128
# use SLAAC to get global IPv6 address from the router
# we may not enable ipv6 forwarding, otherwise SLAAC gets disabled
autoconf 1
accept_ra 2
 
iface eth0 inet6 static
address 2404:9400:213c:6b01:0000:0000:0000:0002/128
# use SLAAC to get global IPv6 address from the router
# we may not enable ipv6 forwarding, otherwise SLAAC gets disabled
autoconf 1
accept_ra 2
 
iface eth0 inet6 static
address 2404:9400:213c:6b01:0000:0000:0000:0003/128
# use SLAAC to get global IPv6 address from the router
# we may not enable ipv6 forwarding, otherwise SLAAC gets disabled
autoconf 1
accept_ra 2