基于nat123 提供的Nat服务，实现内网IP的对外映射（实测Centos 7 自启动）。

1， 创建expect.sh

#!/bin/bash

username="your name"

mypwd="your pwd"

cmdnat123="sudo /usr/local/bin/mono /usr/nat123/nat123linux.sh"

expect -c"

spawn $cmdnat123

while { 1 } {

expect {

\"enter your nat123 username\" {

send \"$username\r\";

}

\"enter your nat123 password\" {

send \"$mypwd\r\";

}

eof {

send \"exit\r\";

}

}

sleep 5;

}

"

echo "Exit ..."

sleep 5

二 创建 service.sh

#!/bin/bash

#description:simple example service

RETVAL=0

start(){

echo "nat123 service is started..."

nohup sudo bash /usr/nat123/expect.sh &

}

stop(){

echo "nat123 service is stoped..."

}

case $1 in

start)

start

;;

stop)

stop

;;

*)

echo "error choice ! please input start or stop";;

esac

exit $RETVA

三 创建 /lib/systemd/system/nat123.service

[root@localhost nat123]# cat /lib/systemd/system/nat123.service

[unit]

Description=nat123

After=network.target

[Service]

Type=forking

ExecStart=/usr/nat123/service.sh start

ExecReload=/bin/kill -s HUP $MAINPID

ExecStop=/bin/kill -s QUIT $MAINPID

PrivateTmp=true

[Install]

WantedBy=multi-user.target

四 添加自启动服务

systemctl start nat123.service

systemctl enable nat123.service