IPv6 Dual Stack Lab

sysctl -p
net.ipv4.ip_forward = 1
net.ipv6.conf.all.forwarding = 1

auto ens4 iface ens4 inet6 static

address 2a02:24d8:71:2441::2/64
gateway 2a02:24d8:71:2441::1

iface ens4 inet4 static

address 194.59.156.163/27 
gateway 194.59.156.161

iface ens5 inet4 static

address 192.168.44.1/24
post-up ip -4 route add 192.168.45.0/24 via 192.168.44.2 
post-up ip -4 route add 192.168.46.0/24 via 192.168.44.2 
post-up ip -4 route add 192.168.47.0/24 via 192.168.44.2 

auto ens5 iface ens5 inet6 static

address 2a02:24d8:71:2444::1/64
post-up ip -6 route add 2a02:24d8:71:2445::0/64 via 2a02:24d8:71:2444::2
post-up ip -6 route add 2a02:24d8:71:2446::0/64 via 2a02:24d8:71:2444::2
post-up ip -6 route add 2a02:24d8:71:2447::0/64 via 2a02:24d8:71:2444::2

cat /etc/nftables.conf 

1. !/usr/sbin/nft -f

flush ruleset

table inet filter { chain input { type filter hook input priority filter; } chain forward { type filter hook forward priority filter; } chain output { type filter hook output priority filter; } }

table ip nat { chain postrouting { type nat hook postrouting priority 100; oif ens4 masquerade } }