```
apt install -y iptables-persistent
# règles dans /etc/iptables/rules.v4 et /etc/iptables/rules.v6
echo 1 >/proc/sys/net/ipv4/ip_forward
sed -i "s/#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/" /etc/sysctl.conf
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables-save > /etc/iptables/rules.v4
```
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