安装iptalbes

sudo apt install iptables

允许端口转发

sysctl net.ipv4.ip_forward=1

设置端口转发

iptables -t nat -A PREROUTING -p tcp --dport 40000:50000 -j REDIRECT --to-ports 443

使用iptables-persistent实现重启后自动启动

sudo apt install iptables-persistent

iptables规则改变后的保存

netfilter-persistent save