首先配置iptables：

iptables -t nat -A PREROUTING -p tcp -m tcp --dport 1000:10000 -j DNAT --to-destina

系統爲ubuntu18.04版本：

首先配置iptables：

iptables -t nat -A PREROUTING -p tcp -m tcp --dport 1000:10000 -j DNAT --to-destination 20.20.20.1:1000-10000
iptables -t nat -A PREROUTING -p udp -m udp --dport 1000:10000 -j DNAT --to-destination 20.20.20.1:1000-10000
iptables -t nat -A POSTROUTING -d 20.20.20.1 -p tcp -m tcp --dport 1000:10000 -j SNAT --to-source 10.10.10.1
iptables -t nat -A POSTROUTING -d 20.20.20.1 -p udp -m udp --dport 1000:10000 -j SNAT --to-source 10.10.10.1

查看配置：iptables -L -t nat

保存iptables配置到文件：/etc/iptables.rules

iptables-save > /etc/iptables.rules

重啓系統後，使配置生效，需要運行命令

iptables-restore < /etc/iptables.rules

可能由於系統環境，以下兩種方式失敗：

在/etc/network/interfaces文件中添加iptables-restore < /etc/iptables.rules命令，重啓系統，iptables配置未生效

在/etc/network/if-pre-up.d/中添加腳本的方式，重啓系統，iptables配置依然失敗

成功解決方法：

vim /etc/rc.local

#!/bin/sh
iptables-restore < /etc/iptables.rules

chmod +x /etc/rc.local

vim /lib/systemd/system/rc.local.service（實例系統已經配置了這個文件，如果沒有，請手動配置）

#  SPDX-License-Identifier: LGPL-2.1+
# 
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

# This unit gets pulled automatically into multi-user.target by
# systemd-rc-local-generator if /etc/rc.local is executable.
[Unit]
Description=/etc/rc.local Compatibility
Documentation=man:systemd-rc-local-generator(8)
ConditionFileIsExecutable=/etc/rc.local
After=network.target

[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
RemainAfterExit=yes
GuessMainPID=no

systemctl enable rc.local

重啓系統測試，iptables配置生效，問題解決

參考文章：https://ilouis.cn/ubuntu/ubuntu_setting_iptables.html

sudo apt install iptables-persistent
sudo dpkg-reconfigure iptables-persistent