Proxmox VE 设置虚拟机 NAT 转发端口内网互通

编辑 PVE 宿主机网卡文件

#在编辑文件之前建议先安装 vim
apt update && apt install vim -y
#然后编辑网卡配置文件
vim /etc/network/interfaces

网卡配置文件内容如下：

    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5)
    source /etc/network/interfaces.d/*
    auto lo
    iface lo inet loopback
 
    allow-hotplug enp1s0
    iface enp4s0 inet manual
 
    auto vmbr0
    iface vmbr0 inet static
            address 101.102.103.104/32
            gateway 101.102.103.1
            bridge-ports enp1s0
            bridge-stp off
            bridge-fd 0
 
    auto vmbr1
    iface vmbr1 inet static
            address 192.168.1.1
            netmask 255.255.255.0
            bridge_ports none
            bridge_stp off
            bridge_fd 0
            post-up echo 1 > /proc/sys/net/ipv4/ip_forward
            post-up bash /root/iptables.config.sh
            post-up iptables -t nat -A POSTROUTING -s '192.168.1.0/24' -o vmbr0 -j MASQUERADE
            post-down iptables -t nat -D POSTROUTING -s '192.168.1.0/24' -o vmbr0 -j MASQUERADE

PVE 宿主机的网卡名为 enp1s0，vmbr0 为独立IP虚拟机的桥接网卡，自行修改为正确的信息；vmbr1 为 NAT 虚拟机的桥接网卡，虚拟机可以使用的内网为 192.168.1.2-192.168.1.254 这些内网IP，网关为 192.168.1.1。

在 /root 目录下新建脚本文件 iptables.sh 脚本内容如下：

    #! /bin/bash
    PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
    export PATH
    #ConfFile
    iptablesconf='/root/iptables.config.sh'
    function rootness(){
        if [[ $EUID -ne 0 ]]; then
           echo "脚本需要以ROOT权限运行!"
           exit 1
        fi
    }
    function conf_list(){
        cat $iptablesconf
    }
    function conf_add(){
        if [ ! -f $iptablesconf ];then
            echo "找不到配置文件!"
            exit 1
        fi
        echo "请输入虚拟机的内网IP"
        read -p "(Default: Exit):" confvmip
        [ -z "$confvmip" ] && exit 1
        echo
        echo "虚拟机内网IP = $confvmip"
        echo
        while true
        do
        echo "请输入虚拟机的端口:"
        read -p "(默认端口: 22):" confvmport
        [ -z "$confvmport" ] && confvmport="22"
        expr $confvmport + 0 &>/dev/null
        if [ $? -eq 0 ]; then
            if [ $confvmport -ge 1 ] && [ $confvmport -le 65535 ]; then
                echo
                echo "虚拟机端口 = $confvmport"
                echo
                break
            else
                echo "输入错误，端口范围应为1-65535!"
            fi
        else
            echo "输入错误，端口范围应为1-65535!"
        fi
        done
        echo
        while true
        do
        echo "请输入宿主机的端口"
        read -p "(默认端口: 8899):" natconfport
        [ -z "$natconfport" ] && natconfport="8899"
        expr $natconfport + 0 &>/dev/null
        if [ $? -eq 0 ]; then
            if [ $natconfport -ge 1 ] && [ $natconfport -le 65535 ]; then
                echo
                echo "宿主机端口 = $natconfport"
                echo
                break
            else
                echo "输入错误，端口范围应为1-65535!"
            fi
        else
            echo "输入错误，端口范围应为1-65535!"
        fi
        done
        echo "请输入转发协议:"
        read -p "(tcp 或者 udp ,回车默认操作: 退出):" conftype
        [ -z "$conftype" ] && exit 1
        echo
        echo "协议类型 = $conftype"
        echo
        iptablesshell="iptables -t nat -A PREROUTING -i vmbr0 -p $conftype --dport $natconfport -j DNAT --to-destination $confvmip:$confvmport"
        if [ `grep -c "$iptablesshell" $iptablesconf` != '0' ]; then
            echo "配置已经存在"
            exit 1
        fi
        get_char(){
            SAVEDSTTY=`stty -g`
            stty -echo
            stty cbreak
            dd if=/dev/tty bs=1 count=1 2> /dev/null
            stty -raw
            stty echo
            stty $SAVEDSTTY
        }
        echo
        echo "回车继续，Ctrl+C退出脚本"
        char=`get_char`
        echo $iptablesshell >> $iptablesconf
        runreturn=`$iptablesshell`
        echo $runreturn
        echo '配置添加成功'
    }
    function add_confs(){
        rootness
        conf_add
    }
    function del_conf(){
        echo
        while true
        do
        echo "请输入宿主机的端口"
        read -p "(默认操作: 退出):" confserverport
        [ -z "$confserverport" ] && exit 1
        expr $confserverport + 0 &>/dev/null
        if [ $? -eq 0 ]; then
            if [ $confserverport -ge 1 ] && [ $confserverport -le 65535 ]; then
                echo
                echo "宿主机端口 = $confserverport"
                echo
                break
            else
                echo "输入错误，端口范围应为1-65535!"
            fi
        else
            echo "输入错误，端口范围应为1-65535!"
        fi
        done
        echo
        iptablesshelldel=`cat $iptablesconf | grep "dport $confserverport"`
        if [ ! -n "$iptablesshelldel" ]; then
             echo "配置文件中没有该宿主机的端口"
             exit 1
        fi
        iptablesshelldelshell=`echo ${iptablesshelldel//-A/-D}`
        runreturn=`$iptablesshelldelshell`
        echo $runreturn
        sed -i "/$iptablesshelldel/d" $iptablesconf
        echo '配置删除成功'
    }
    function del_confs(){
        printf "你确定要删除配置吗？操作是不可逆的(y/n) "
        printf "\n"
        read -p "(默认: n):" answer
        if [ -z $answer ]; then
            answer="n"
        fi
        if [ "$answer" = "y" ]; then
            rootness
            del_conf
        else
            echo "配置删除操作取消"
        fi
    }
    action=$1
    case "$action" in
    add)
        add_confs
        ;;
    list)
        conf_list
        ;;
    del)
        del_confs
        ;;
    *)
        echo "参数错误! [${action} ]"
        echo "用法: `basename $0` {add|list|del}"
        ;;
    esac

然后在 /root 目录下新建脚本配置文件 iptables.config.sh 脚本配置文件内容如下：

#!/usr/bin/env bash

使用方法：

上传脚本到宿主机 root 目录，赋予iptables.config.sh可执行权限 chmod +x iptables.config.sh

bash iptables.sh add  #添加端口映射
bash iptables.sh del  #删除端口映射