diff --git a/plugins/l2tp/ico.png b/plugins/l2tp/ico.png
new file mode 100644
index 000000000..ddfd2f89b
Binary files /dev/null and b/plugins/l2tp/ico.png differ
diff --git a/plugins/l2tp/index.html b/plugins/l2tp/index.html
new file mode 100755
index 000000000..834706386
--- /dev/null
+++ b/plugins/l2tp/index.html
@@ -0,0 +1,16 @@
+<div class="bt-form">
+	<div class="bt-w-main">
+		<div class="bt-w-menu">
+			<p class="bgw" onclick="pluginService('pm2');">服务</p>
+			<p onclick="pluginInitD('pm2');">项目列表</p>
+			<p onclick="pluginConfig('pm2');">Node版本</p>
+			<p onclick="redisStatus();">模版管理</p>
+			<p onclick="pluginLogs('pm2','','run_log');">日志管理</p>
+		</div>
+		<div class="bt-w-con pd15">
+			<div class="soft-man-con"></div>
+		</div>
+	</div>
+</div>
+<script type="text/javascript">
+</script>
\ No newline at end of file
diff --git a/plugins/l2tp/index.py b/plugins/l2tp/index.py
new file mode 100755
index 000000000..461db59c8
--- /dev/null
+++ b/plugins/l2tp/index.py
@@ -0,0 +1,474 @@
+# coding:utf-8
+
+import sys
+import io
+import os
+import time
+import shutil
+
+sys.path.append(os.getcwd() + "/class/core")
+import public
+
+app_debug = False
+if public.isAppleSystem():
+    app_debug = True
+
+
+def getPluginName():
+    return 'pureftp'
+
+
+def getPluginDir():
+    return public.getPluginDir() + '/' + getPluginName()
+
+
+def getServerDir():
+    return public.getServerDir() + '/' + getPluginName()
+
+
+def getInitDFile():
+    if app_debug:
+        return '/tmp/' + getPluginName()
+    return '/etc/init.d/' + getPluginName()
+
+
+def getConf():
+    path = getServerDir() + "/etc/pure-ftpd.conf"
+    return path
+
+
+def getInitDTpl():
+    path = getPluginDir() + "/init.d/pure-ftpd.tpl"
+    return path
+
+
+def getArgs():
+    args = sys.argv[2:]
+    tmp = {}
+    args_len = len(args)
+
+    if args_len == 1:
+        t = args[0].strip('{').strip('}')
+        t = t.split(':')
+        tmp[t[0]] = t[1]
+    elif args_len > 1:
+        for i in range(len(args)):
+            t = args[i].split(':')
+            tmp[t[0]] = t[1]
+
+    return tmp
+
+
+def status():
+    cmd = "ps -ef|grep pure-ftpd |grep -v grep | grep -v python | awk '{print $2}'"
+    data = public.execShell(cmd)
+    if data[0] == '':
+        return 'stop'
+    return 'start'
+
+
+def contentReplace(content):
+    service_path = public.getServerDir()
+    content = content.replace('{$ROOT_PATH}', public.getRootDir())
+    content = content.replace('{$SERVER_PATH}', service_path)
+    return content
+
+
+def initDreplace():
+
+    file_tpl = getInitDTpl()
+    service_path = os.path.dirname(os.getcwd())
+
+    initD_path = getServerDir() + '/init.d'
+    if not os.path.exists(initD_path):
+        os.mkdir(initD_path)
+    file_bin = initD_path + '/' + getPluginName()
+
+    # initd replace
+    if not os.path.exists(file_bin):
+        content = public.readFile(file_tpl)
+        content = contentReplace(content)
+        public.writeFile(file_bin, content)
+        public.execShell('chmod +x ' + file_bin)
+
+    pureSbinConfig = getServerDir() + "/sbin/pure-config.pl"
+    if not os.path.exists(pureSbinConfig):
+        pureTplConfig = getPluginDir() + "/init.d/pure-config.pl"
+        content = public.readFile(pureTplConfig)
+        content = contentReplace(content)
+        public.writeFile(pureSbinConfig, content)
+        public.execShell('chmod +x ' + pureSbinConfig)
+
+    pureFtpdConfig = getServerDir() + "/etc/pure-ftpd.conf"
+    pureFtpdConfigBak = getServerDir() + "/etc/pure-ftpd.bak.conf"
+    pureFtpdConfigTpl = getPluginDir() + "/conf/pure-ftpd.conf"
+
+    if not os.path.exists(pureFtpdConfigBak):
+        shutil.copyfile(pureFtpdConfig, pureFtpdConfigBak)
+        content = public.readFile(pureFtpdConfigTpl)
+        content = contentReplace(content)
+        public.writeFile(pureFtpdConfig, content)
+
+    return file_bin
+
+
+def start():
+    file = initDreplace()
+    data = public.execShell(file + ' start')
+    if data[1] == '':
+        return 'ok'
+    return data[1]
+
+
+def stop():
+    file = initDreplace()
+    data = public.execShell(file + ' stop')
+    if data[1] == '':
+        return 'ok'
+    return data[1]
+
+
+def restart():
+    file = initDreplace()
+    data = public.execShell(file + ' restart')
+    if data[1] == '':
+        return 'ok'
+    return 'fail'
+
+
+def reload():
+    file = initDreplace()
+    data = public.execShell(file + ' reload')
+    if data[1] == '':
+        return 'ok'
+    return data[1]
+
+
+def initdStatus():
+    if not app_debug:
+        os_name = public.getOs()
+        if os_name == 'darwin':
+            return "Apple Computer does not support"
+    initd_bin = getInitDFile()
+    if os.path.exists(initd_bin):
+        return 'ok'
+    return 'fail'
+
+
+def initdInstall():
+    import shutil
+    if not app_debug:
+        os_name = public.getOs()
+        if os_name == 'darwin':
+            return "Apple Computer does not support"
+
+    source_bin = initDreplace()
+    initd_bin = getInitDFile()
+    shutil.copyfile(source_bin, initd_bin)
+    public.execShell('chmod +x ' + initd_bin)
+    return 'ok'
+
+
+def initdUinstall():
+    if not app_debug:
+        os_name = public.getOs()
+        if os_name == 'darwin':
+            return "Apple Computer does not support"
+    initd_bin = getInitDFile()
+    os.remove(initd_bin)
+    return 'ok'
+
+
+def pftpDB():
+    file = getServerDir() + '/ftps.db'
+    if not os.path.exists(file):
+        conn = public.M('ftps').dbPos(getServerDir(), 'ftps')
+        csql = public.readFile(getPluginDir() + '/conf/ftps.sql')
+        csql_list = csql.split(';')
+        for index in range(len(csql_list)):
+            conn.execute(csql_list[index], ())
+    else:
+        conn = public.M('ftps').dbPos(getServerDir(), 'ftps')
+    return conn
+
+
+def pftpUser():
+    if public.isAppleSystem():
+        user = public.execShell(
+            "who | sed -n '2, 1p' |awk '{print $1}'")[0].strip()
+        return user
+    return 'www'
+
+
+def pftpAdd(username, password, path):
+    user = pftpUser()
+
+    if not os.path.exists(path):
+        os.makedirs(path)
+        if public.isAppleSystem():
+            os.system('chown ' + user + '.staff ' + path)
+        else:
+            os.system('chown www.www ' + path)
+
+    cmd = getServerDir() + '/bin/pure-pw useradd ' + username + ' -u ' + user + ' -d ' + \
+        path + '<<EOF \n' + password + '\n' + password + '\nEOF'
+    return public.execShell(cmd)
+
+
+def pftpMod(username, password):
+    user = pftpUser()
+    cmd = getServerDir() + '/bin/pure-pw passwd ' + username + \
+        '<<EOF \n' + password + '\n' + password + '\nEOF'
+    return public.execShell(cmd)
+
+
+def pftpStop(username):
+    cmd = getServerDir() + '/bin/pure-pw usermod ' + username + ' -r 1'
+    return public.execShell(cmd)
+
+
+def pftpStart(username):
+    cmd = getServerDir() + '/bin/pure-pw usermod ' + username + " -r ''"
+    return public.execShell(cmd)
+
+
+def pftpReload():
+    public.execShell(getServerDir() + '/bin/pure-pw mkdb ' +
+                     getServerDir() + '/etc/pureftpd.pdb')
+
+
+def getWwwDir():
+    path = public.getWwwDir()
+    return path
+
+
+def getFtpPort():
+    import re
+    try:
+        file = getServerDir() + '/etc/pure-ftpd.conf'
+        conf = public.readFile(file)
+        rep = "\n#?\s*Bind\s+[0-9]+\.[0-9]+\.[0-9]+\.+[0-9]+,([0-9]+)"
+        port = re.search(rep, conf).groups()[0]
+    except:
+        port = '21'
+    return port
+
+
+def getFtpList():
+    args = getArgs()
+    page = 1
+    page_size = 10
+    search = ''
+    if 'page' in args:
+        page = int(args['page'])
+
+    if 'page_size' in args:
+        page_size = int(args['page_size'])
+
+    if 'search' in args:
+        search = args['search']
+
+    data = {}
+    conn = pftpDB()
+    limit = str((page - 1) * page_size) + ',' + str(page_size)
+    # print limit, search
+    condition = ''
+    if not search == '':
+        condition = "name like '%" + search + "%'"
+    field = 'id,pid,name,password,path,status,ps,addtime'
+    clist = conn.where(condition, ()).field(
+        field).limit(limit).order('id desc').select()
+
+    count = conn.where(condition, ()).count()
+    _page = {}
+    _page['count'] = count
+    _page['p'] = page
+    _page['row'] = page_size
+    _page['tojs'] = 'ftpList'
+    data['page'] = public.getPage(_page)
+
+    info = {}
+    info['ip'] = public.getLocalIp()
+    info['port'] = getFtpPort()
+    data['info'] = info
+    data['data'] = clist
+
+    return public.getJson(data)
+
+
+def addFtp():
+    import urllib
+    args = getArgs()
+    if not 'ftp_username' in args:
+        return 'ftp_username missing'
+
+    if not 'ftp_password' in args:
+        return 'ftp_password missing'
+
+    if not 'path' in args:
+        return 'path missing'
+
+    if not 'ps' in args:
+        return 'ps missing'
+
+    path = urllib.unquote(args['path'])
+    user = args['ftp_username']
+    pwd = args['ftp_password']
+    ps = args['ps']
+
+    addtime = time.strftime('%Y-%m-%d %X', time.localtime())
+
+    data = pftpAdd(user, pwd, path)
+    conn = pftpDB()
+    conn.add('pid,name,password,path,status,ps,addtime',
+             (0, user, pwd, path, 1, ps, addtime))
+    pftpReload()
+    if data[1] == '':
+        return 'ok'
+    return data[0]
+
+
+def delFtp():
+    args = getArgs()
+    if not 'id' in args:
+        return 'ftp_username missing'
+
+    if not 'username' in args:
+        return 'username missing'
+
+    public.execShell(getServerDir() +
+                     '/bin/pure-pw userdel ' + args['username'])
+    pftpReload()
+    conn = pftpDB()
+    conn.where("id=?", (args['id'],)).delete()
+    public.writeLog('TYPE_FTP', 'FTP_DEL_SUCCESS', (args['username'],))
+    return 'ok'
+
+
+def modFtp():
+    args = getArgs()
+    if not 'id' in args:
+        return 'id missing'
+
+    if not 'name' in args:
+        return 'name missing'
+
+    if not 'password' in args:
+        return 'password missing'
+
+    conn = pftpDB()
+    data = pftpMod(args['name'], args['password'])
+    pftpReload()
+
+    conn.where('id=?', (int(args['id']),)).save(
+        'password', (args['password'],))
+    # print data
+    if data[1] == '':
+        return 'ok'
+    return data[0]
+
+
+def modFtpPort():
+    import re
+    args = getArgs()
+    if not 'port' in args:
+        return 'port missing'
+    try:
+        port = args['port']
+        if int(port) < 1 or int(port) > 65535:
+            return '端口范围不正确!'
+        file = file = getServerDir() + '/etc/pure-ftpd.conf'
+        conf = public.readFile(file)
+        rep = u"\n#?\s*Bind\s+[0-9]+\.[0-9]+\.[0-9]+\.+[0-9]+,([0-9]+)"
+        # preg_match(rep,conf,tmp)
+        conf = re.sub(
+            rep, "\nBind                         0.0.0.0," + port, conf)
+        public.writeFile(file, conf)
+        restart()
+        return 'ok'
+    except Exception as ex:
+        return str(ex)
+
+
+def stopPort():
+    args = getArgs()
+    if not 'id' in args:
+        return 'id missing'
+
+    if not 'username' in args:
+        return 'username missing'
+
+    if not 'status' in args:
+        return 'status missing'
+
+    data = pftpStop(args['username'])
+    pftpReload()
+    conn = pftpDB()
+    conn.where('id=?', (int(args['id']),)).save(
+        'status', (args['status'],))
+
+    if data[1] == '':
+        return 'ok'
+    return data[0]
+
+
+def startPort():
+    args = getArgs()
+    if not 'id' in args:
+        return 'id missing'
+
+    if not 'username' in args:
+        return 'username missing'
+
+    if not 'status' in args:
+        return 'status missing'
+
+    data = pftpStart(args['username'])
+    pftpReload()
+    conn = pftpDB()
+    conn.where('id=?', (int(args['id']),)).save(
+        'status', (args['status'],))
+
+    if data[1] == '':
+        return 'ok'
+    return data[0]
+
+
+if __name__ == "__main__":
+    func = sys.argv[1]
+    if func == 'status':
+        print status()
+    elif func == 'start':
+        print start()
+    elif func == 'stop':
+        print stop()
+    elif func == 'restart':
+        print restart()
+    elif func == 'reload':
+        print reload()
+    elif func == 'initd_status':
+        print initdStatus()
+    elif func == 'initd_install':
+        print initdInstall()
+    elif func == 'initd_uninstall':
+        print initdUinstall()
+    elif func == 'conf':
+        print getConf()
+    elif func == 'get_www_dir':
+        print getWwwDir()
+    elif func == 'get_ftp_list':
+        print getFtpList()
+    elif func == 'add_ftp':
+        print addFtp()
+    elif func == 'del_ftp':
+        print delFtp()
+    elif func == 'mod_ftp':
+        print modFtp()
+    elif func == 'mod_ftp_port':
+        print modFtpPort()
+    elif func == 'stop_ftp':
+        print stopPort()
+    elif func == 'start_ftp':
+        print startPort()
+    else:
+        print 'error'
diff --git a/plugins/l2tp/info.json b/plugins/l2tp/info.json
new file mode 100755
index 000000000..8d3ab2fb1
--- /dev/null
+++ b/plugins/l2tp/info.json
@@ -0,0 +1,14 @@
+{
+	"title":"L2TP",
+	"tip":"soft",
+	"name":"l2tp",
+	"type":"运行环境",
+	"ps":"VPN网关",
+	"versions":"1.0",
+	"shell":"install.sh",
+	"checks":"server/l2tp",
+	"author":"teddysun",
+	"home":"https://github.com/teddysun/across/blob/master/l2tp.sh",
+	"date":"2019-02-27",
+	"pid": "4"
+}
\ No newline at end of file
diff --git a/plugins/l2tp/install.sh b/plugins/l2tp/install.sh
new file mode 100755
index 000000000..6f16b3bf5
--- /dev/null
+++ b/plugins/l2tp/install.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
+export PATH
+
+
+curPath=`pwd`
+rootPath=$(dirname "$curPath")
+rootPath=$(dirname "$rootPath")
+serverPath=$(dirname "$rootPath")
+
+
+install_tmp=${rootPath}/tmp/bt_install.pl
+
+npm install pm2 -g
+
+Install_pm2()
+{
+	echo '正在安装脚本文件...' > $install_tmp
+	mkdir -p $serverPath/pm2
+	echo '1.0' > $serverPath/pm2/version.pl
+	echo '安装完成' > $install_tmp
+}
+
+Uninstall_pm2()
+{
+	rm -rf $serverPath/pm2
+	echo "卸载完成" > $install_tmp
+}
+
+action=$1
+if [ "${1}" == 'install' ];then
+	Install_pm2
+else
+	Uninstall_pm2
+fi
diff --git a/plugins/l2tp/scripts/l2tp.sh b/plugins/l2tp/scripts/l2tp.sh
new file mode 100644
index 000000000..0fb341989
--- /dev/null
+++ b/plugins/l2tp/scripts/l2tp.sh
@@ -0,0 +1,810 @@
+#!/usr/bin/env bash
+PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
+export PATH
+#=======================================================================#
+#   System Supported:  CentOS 6+ / Debian 7+ / Ubuntu 12+               #
+#   Description: L2TP VPN Auto Installer                                #
+#   Author: Teddysun <i@teddysun.com>                                   #
+#   Intro:  https://teddysun.com/448.html                               #
+#=======================================================================#
+cur_dir=`pwd`
+
+libreswan_filename="libreswan-3.27"
+download_root_url="https://dl.lamp.sh/files"
+
+rootness(){
+    if [[ $EUID -ne 0 ]]; then
+       echo "Error:This script must be run as root!" 1>&2
+       exit 1
+    fi
+}
+
+tunavailable(){
+    if [[ ! -e /dev/net/tun ]]; then
+        echo "Error:TUN/TAP is not available!" 1>&2
+        exit 1
+    fi
+}
+
+disable_selinux(){
+if [ -s /etc/selinux/config ] && grep 'SELINUX=enforcing' /etc/selinux/config; then
+    sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
+    setenforce 0
+fi
+}
+
+get_opsy(){
+    [ -f /etc/redhat-release ] && awk '{print ($1,$3~/^[0-9]/?$3:$4)}' /etc/redhat-release && return
+    [ -f /etc/os-release ] && awk -F'[= "]' '/PRETTY_NAME/{print $3,$4,$5}' /etc/os-release && return
+    [ -f /etc/lsb-release ] && awk -F'[="]+' '/DESCRIPTION/{print $2}' /etc/lsb-release && return
+}
+
+get_os_info(){
+    IP=$( ip addr | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | egrep -v "^192\.168|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-2]\.|^10\.|^127\.|^255\.|^0\." | head -n 1 )
+    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipv4.icanhazip.com )
+
+    local cname=$( awk -F: '/model name/ {name=$2} END {print name}' /proc/cpuinfo | sed 's/^[ \t]*//;s/[ \t]*$//' )
+    local cores=$( awk -F: '/model name/ {core++} END {print core}' /proc/cpuinfo )
+    local freq=$( awk -F: '/cpu MHz/ {freq=$2} END {print freq}' /proc/cpuinfo | sed 's/^[ \t]*//;s/[ \t]*$//' )
+    local tram=$( free -m | awk '/Mem/ {print $2}' )
+    local swap=$( free -m | awk '/Swap/ {print $2}' )
+    local up=$( awk '{a=$1/86400;b=($1%86400)/3600;c=($1%3600)/60;d=$1%60} {printf("%ddays, %d:%d:%d\n",a,b,c,d)}' /proc/uptime )
+    local load=$( w | head -1 | awk -F'load average:' '{print $2}' | sed 's/^[ \t]*//;s/[ \t]*$//' )
+    local opsy=$( get_opsy )
+    local arch=$( uname -m )
+    local lbit=$( getconf LONG_BIT )
+    local host=$( hostname )
+    local kern=$( uname -r )
+
+    echo "########## System Information ##########"
+    echo 
+    echo "CPU model            : ${cname}"
+    echo "Number of cores      : ${cores}"
+    echo "CPU frequency        : ${freq} MHz"
+    echo "Total amount of ram  : ${tram} MB"
+    echo "Total amount of swap : ${swap} MB"
+    echo "System uptime        : ${up}"
+    echo "Load average         : ${load}"
+    echo "OS                   : ${opsy}"
+    echo "Arch                 : ${arch} (${lbit} Bit)"
+    echo "Kernel               : ${kern}"
+    echo "Hostname             : ${host}"
+    echo "IPv4 address         : ${IP}"
+    echo 
+    echo "########################################"
+}
+
+check_sys(){
+    local checkType=$1
+    local value=$2
+
+    local release=''
+    local systemPackage=''
+
+    if [[ -f /etc/redhat-release ]]; then
+        release="centos"
+        systemPackage="yum"
+    elif cat /etc/issue | grep -Eqi "debian"; then
+        release="debian"
+        systemPackage="apt"
+    elif cat /etc/issue | grep -Eqi "ubuntu"; then
+        release="ubuntu"
+        systemPackage="apt"
+    elif cat /etc/issue | grep -Eqi "centos|red hat|redhat"; then
+        release="centos"
+        systemPackage="yum"
+    elif cat /proc/version | grep -Eqi "debian"; then
+        release="debian"
+        systemPackage="apt"
+    elif cat /proc/version | grep -Eqi "ubuntu"; then
+        release="ubuntu"
+        systemPackage="apt"
+    elif cat /proc/version | grep -Eqi "centos|red hat|redhat"; then
+        release="centos"
+        systemPackage="yum"
+    fi
+
+    if [[ ${checkType} == "sysRelease" ]]; then
+        if [ "$value" == "$release" ];then
+            return 0
+        else
+            return 1
+        fi
+    elif [[ ${checkType} == "packageManager" ]]; then
+        if [ "$value" == "$systemPackage" ];then
+            return 0
+        else
+            return 1
+        fi
+    fi
+}
+
+rand(){
+    index=0
+    str=""
+    for i in {a..z}; do arr[index]=${i}; index=`expr ${index} + 1`; done
+    for i in {A..Z}; do arr[index]=${i}; index=`expr ${index} + 1`; done
+    for i in {0..9}; do arr[index]=${i}; index=`expr ${index} + 1`; done
+    for i in {1..10}; do str="$str${arr[$RANDOM%$index]}"; done
+    echo ${str}
+}
+
+is_64bit(){
+    if [ `getconf WORD_BIT` = '32' ] && [ `getconf LONG_BIT` = '64' ] ; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+download_file(){
+    if [ -s ${1} ]; then
+        echo "$1 [found]"
+    else
+        echo "$1 not found!!!download now..."
+        if ! wget -c -t3 -T60 ${download_root_url}/${1}; then
+            echo "Failed to download $1, please download it to ${cur_dir} directory manually and try again."
+            exit 1
+        fi
+    fi
+}
+
+versionget(){
+    if [[ -s /etc/redhat-release ]];then
+        grep -oE  "[0-9.]+" /etc/redhat-release
+    else
+        grep -oE  "[0-9.]+" /etc/issue
+    fi
+}
+
+centosversion(){
+    if check_sys sysRelease centos;then
+        local code=${1}
+        local version="`versionget`"
+        local main_ver=${version%%.*}
+        if [ "${main_ver}" == "${code}" ];then
+            return 0
+        else
+            return 1
+        fi
+    else
+        return 1
+    fi
+}
+
+debianversion(){
+    if check_sys sysRelease debian;then
+        local version=$( get_opsy )
+        local code=${1}
+        local main_ver=$( echo ${version} | sed 's/[^0-9]//g')
+        if [ "${main_ver}" == "${code}" ];then
+            return 0
+        else
+            return 1
+        fi
+    else
+        return 1
+    fi
+}
+
+version_check(){
+    if check_sys packageManager yum; then
+        if centosversion 5; then
+            echo "Error: CentOS 5 is not supported, Please re-install OS and try again."
+            exit 1
+        fi
+    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
+}
+
+preinstall_l2tp(){
+
+    echo
+    if [ -d "/proc/vz" ]; then
+        echo -e "\033[41;37m WARNING: \033[0m Your VPS is based on OpenVZ, and IPSec might not be supported by the kernel."
+        echo "Continue installation? (y/n)"
+        read -p "(Default: n)" agree
+        [ -z ${agree} ] && agree="n"
+        if [ "${agree}" == "n" ]; then
+            echo
+            echo "L2TP installation cancelled."
+            echo
+            exit 0
+        fi
+    fi
+    echo
+    echo "Please enter IP-Range:"
+    read -p "(Default Range: 192.168.18):" iprange
+    [ -z ${iprange} ] && iprange="192.168.18"
+
+    echo "Please enter PSK:"
+    read -p "(Default PSK: teddysun.com):" mypsk
+    [ -z ${mypsk} ] && mypsk="teddysun.com"
+
+    echo "Please enter Username:"
+    read -p "(Default Username: teddysun):" username
+    [ -z ${username} ] && username="teddysun"
+
+    password=`rand`
+    echo "Please enter ${username}'s password:"
+    read -p "(Default Password: ${password}):" tmppassword
+    [ ! -z ${tmppassword} ] && password=${tmppassword}
+
+    echo
+    echo "ServerIP:${IP}"
+    echo "Server Local IP:${iprange}.1"
+    echo "Client Remote IP Range:${iprange}.2-${iprange}.254"
+    echo "PSK:${mypsk}"
+    echo
+    echo "Press any key to start... or press Ctrl + C to cancel."
+    char=`get_char`
+
+}
+
+install_l2tp(){
+
+    mknod /dev/random c 1 9
+
+    if check_sys packageManager apt; then
+        apt-get -y update
+
+        if debianversion 7; then
+            if is_64bit; then
+                local libnspr4_filename1="libnspr4_4.10.7-1_amd64.deb"
+                local libnspr4_filename2="libnspr4-0d_4.10.7-1_amd64.deb"
+                local libnspr4_filename3="libnspr4-dev_4.10.7-1_amd64.deb"
+                local libnspr4_filename4="libnspr4-dbg_4.10.7-1_amd64.deb"
+                local libnss3_filename1="libnss3_3.17.2-1.1_amd64.deb"
+                local libnss3_filename2="libnss3-1d_3.17.2-1.1_amd64.deb"
+                local libnss3_filename3="libnss3-tools_3.17.2-1.1_amd64.deb"
+                local libnss3_filename4="libnss3-dev_3.17.2-1.1_amd64.deb"
+                local libnss3_filename5="libnss3-dbg_3.17.2-1.1_amd64.deb"
+            else
+                local libnspr4_filename1="libnspr4_4.10.7-1_i386.deb"
+                local libnspr4_filename2="libnspr4-0d_4.10.7-1_i386.deb"
+                local libnspr4_filename3="libnspr4-dev_4.10.7-1_i386.deb"
+                local libnspr4_filename4="libnspr4-dbg_4.10.7-1_i386.deb"
+                local libnss3_filename1="libnss3_3.17.2-1.1_i386.deb"
+                local libnss3_filename2="libnss3-1d_3.17.2-1.1_i386.deb"
+                local libnss3_filename3="libnss3-tools_3.17.2-1.1_i386.deb"
+                local libnss3_filename4="libnss3-dev_3.17.2-1.1_i386.deb"
+                local libnss3_filename5="libnss3-dbg_3.17.2-1.1_i386.deb"
+            fi
+            rm -rf ${cur_dir}/l2tp
+            mkdir -p ${cur_dir}/l2tp
+            cd ${cur_dir}/l2tp
+            download_file "${libnspr4_filename1}"
+            download_file "${libnspr4_filename2}"
+            download_file "${libnspr4_filename3}"
+            download_file "${libnspr4_filename4}"
+            download_file "${libnss3_filename1}"
+            download_file "${libnss3_filename2}"
+            download_file "${libnss3_filename3}"
+            download_file "${libnss3_filename4}"
+            download_file "${libnss3_filename5}"
+            dpkg -i ${libnspr4_filename1} ${libnspr4_filename2} ${libnspr4_filename3} ${libnspr4_filename4}
+            dpkg -i ${libnss3_filename1} ${libnss3_filename2} ${libnss3_filename3} ${libnss3_filename4} ${libnss3_filename5}
+
+            apt-get -y install wget gcc ppp flex bison make pkg-config libpam0g-dev libcap-ng-dev iptables \
+                               libcap-ng-utils libunbound-dev libevent-dev libcurl4-nss-dev libsystemd-daemon-dev
+        else
+            apt-get -y install wget gcc ppp flex bison make python libnss3-dev libnss3-tools libselinux-dev iptables \
+                               libnspr4-dev pkg-config libpam0g-dev libcap-ng-dev libcap-ng-utils libunbound-dev \
+                               libevent-dev libcurl4-nss-dev libsystemd-dev
+        fi
+        apt-get -y --no-install-recommends install xmlto
+        apt-get -y install xl2tpd
+
+        compile_install
+    elif check_sys packageManager yum; then
+        echo "Adding the EPEL repository..."
+        yum -y install epel-release yum-utils
+        [ ! -f /etc/yum.repos.d/epel.repo ] && echo "Install EPEL repository failed, please check it." && exit 1
+        yum-config-manager --enable epel
+        echo "Adding the EPEL repository complete..."
+
+        if centosversion 7; then
+            yum -y install ppp libreswan xl2tpd firewalld
+            yum_install
+        elif centosversion 6; then
+            yum -y remove libevent-devel
+            yum -y install libevent2-devel
+            yum -y install nss-devel nspr-devel pkgconfig pam-devel \
+                           libcap-ng-devel libselinux-devel lsof \
+                           curl-devel flex bison gcc ppp make iptables gmp-devel \
+                           fipscheck-devel unbound-devel xmlto libpcap-devel xl2tpd
+
+            compile_install
+        fi
+    fi
+
+}
+
+config_install(){
+
+    cat > /etc/ipsec.conf<<EOF
+version 2.0
+
+config setup
+    protostack=netkey
+    nhelpers=0
+    uniqueids=no
+    interfaces=%defaultroute
+    virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!${iprange}.0/24
+
+conn l2tp-psk
+    rightsubnet=vhost:%priv
+    also=l2tp-psk-nonat
+
+conn l2tp-psk-nonat
+    authby=secret
+    pfs=no
+    auto=add
+    keyingtries=3
+    rekey=no
+    ikelifetime=8h
+    keylife=1h
+    type=transport
+    left=%defaultroute
+    leftid=${IP}
+    leftprotoport=17/1701
+    right=%any
+    rightprotoport=17/%any
+    dpddelay=40
+    dpdtimeout=130
+    dpdaction=clear
+    sha2-truncbug=yes
+EOF
+
+    cat > /etc/ipsec.secrets<<EOF
+%any %any : PSK "${mypsk}"
+EOF
+
+    cat > /etc/xl2tpd/xl2tpd.conf<<EOF
+[global]
+port = 1701
+
+[lns default]
+ip range = ${iprange}.2-${iprange}.254
+local ip = ${iprange}.1
+require chap = yes
+refuse pap = yes
+require authentication = yes
+name = l2tpd
+ppp debug = yes
+pppoptfile = /etc/ppp/options.xl2tpd
+length bit = yes
+EOF
+
+    cat > /etc/ppp/options.xl2tpd<<EOF
+ipcp-accept-local
+ipcp-accept-remote
+require-mschap-v2
+ms-dns 8.8.8.8
+ms-dns 8.8.4.4
+noccp
+auth
+hide-password
+idle 1800
+mtu 1410
+mru 1410
+nodefaultroute
+debug
+proxyarp
+connect-delay 5000
+EOF
+
+    rm -f /etc/ppp/chap-secrets
+    cat > /etc/ppp/chap-secrets<<EOF
+# Secrets for authentication using CHAP
+# client    server    secret    IP addresses
+${username}    l2tpd    ${password}       *
+EOF
+
+}
+
+compile_install(){
+
+    rm -rf ${cur_dir}/l2tp
+    mkdir -p ${cur_dir}/l2tp
+    cd ${cur_dir}/l2tp
+    download_file "${libreswan_filename}.tar.gz"
+    tar -zxf ${libreswan_filename}.tar.gz
+
+    cd ${cur_dir}/l2tp/${libreswan_filename}
+        cat > Makefile.inc.local <<'EOF'
+WERROR_CFLAGS =
+USE_DNSSEC = false
+USE_DH31 = false
+USE_GLIBC_KERN_FLIP_HEADERS = true
+EOF
+    make programs && make install
+
+    /usr/local/sbin/ipsec --version >/dev/null 2>&1
+    if [ $? -ne 0 ]; then
+        echo "${libreswan_filename} install failed."
+        exit 1
+    fi
+
+    config_install
+
+    cp -pf /etc/sysctl.conf /etc/sysctl.conf.bak
+
+    sed -i 's/net.ipv4.ip_forward = 0/net.ipv4.ip_forward = 1/g' /etc/sysctl.conf
+
+    for each in `ls /proc/sys/net/ipv4/conf/`; do
+        echo "net.ipv4.conf.${each}.accept_source_route=0" >> /etc/sysctl.conf
+        echo "net.ipv4.conf.${each}.accept_redirects=0" >> /etc/sysctl.conf
+        echo "net.ipv4.conf.${each}.send_redirects=0" >> /etc/sysctl.conf
+        echo "net.ipv4.conf.${each}.rp_filter=0" >> /etc/sysctl.conf
+    done
+    sysctl -p
+
+    if centosversion 6; then
+        [ -f /etc/sysconfig/iptables ] && cp -pf /etc/sysconfig/iptables /etc/sysconfig/iptables.old.`date +%Y%m%d`
+
+        if [ "`iptables -L -n | grep -c '\-\-'`" == "0" ]; then
+            cat > /etc/sysconfig/iptables <<EOF
+# Added by L2TP VPN script
+*filter
+:INPUT ACCEPT [0:0]
+:FORWARD ACCEPT [0:0]
+:OUTPUT ACCEPT [0:0]
+-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
+-A INPUT -p icmp -j ACCEPT
+-A INPUT -i lo -j ACCEPT
+-A INPUT -p tcp --dport 22 -j ACCEPT
+-A INPUT -p udp -m multiport --dports 500,4500,1701 -j ACCEPT
+-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+-A FORWARD -s ${iprange}.0/24  -j ACCEPT
+COMMIT
+*nat
+:PREROUTING ACCEPT [0:0]
+:OUTPUT ACCEPT [0:0]
+:POSTROUTING ACCEPT [0:0]
+-A POSTROUTING -s ${iprange}.0/24 -j SNAT --to-source ${IP}
+COMMIT
+EOF
+        else
+            iptables -I INPUT -p udp -m multiport --dports 500,4500,1701 -j ACCEPT
+            iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+            iptables -I FORWARD -s ${iprange}.0/24  -j ACCEPT
+            iptables -t nat -A POSTROUTING -s ${iprange}.0/24 -j SNAT --to-source ${IP}
+            /etc/init.d/iptables save
+        fi
+
+        if [ ! -f /etc/ipsec.d/cert9.db ]; then
+           echo > /var/tmp/libreswan-nss-pwd
+           certutil -N -f /var/tmp/libreswan-nss-pwd -d /etc/ipsec.d
+           rm -f /var/tmp/libreswan-nss-pwd
+        fi
+
+        chkconfig --add iptables
+        chkconfig iptables on
+        chkconfig --add ipsec
+        chkconfig ipsec on
+        chkconfig --add xl2tpd
+        chkconfig xl2tpd on
+
+        /etc/init.d/iptables restart
+        /etc/init.d/ipsec start
+        /etc/init.d/xl2tpd start
+
+    else
+        [ -f /etc/iptables.rules ] && cp -pf /etc/iptables.rules /etc/iptables.rules.old.`date +%Y%m%d`
+
+        if [ "`iptables -L -n | grep -c '\-\-'`" == "0" ]; then
+            cat > /etc/iptables.rules <<EOF
+# Added by L2TP VPN script
+*filter
+:INPUT ACCEPT [0:0]
+:FORWARD ACCEPT [0:0]
+:OUTPUT ACCEPT [0:0]
+-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
+-A INPUT -p icmp -j ACCEPT
+-A INPUT -i lo -j ACCEPT
+-A INPUT -p tcp --dport 22 -j ACCEPT
+-A INPUT -p udp -m multiport --dports 500,4500,1701 -j ACCEPT
+-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+-A FORWARD -s ${iprange}.0/24  -j ACCEPT
+COMMIT
+*nat
+:PREROUTING ACCEPT [0:0]
+:OUTPUT ACCEPT [0:0]
+:POSTROUTING ACCEPT [0:0]
+-A POSTROUTING -s ${iprange}.0/24 -j SNAT --to-source ${IP}
+COMMIT
+EOF
+        else
+            iptables -I INPUT -p udp -m multiport --dports 500,4500,1701 -j ACCEPT
+            iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+            iptables -I FORWARD -s ${iprange}.0/24  -j ACCEPT
+            iptables -t nat -A POSTROUTING -s ${iprange}.0/24 -j SNAT --to-source ${IP}
+            /sbin/iptables-save > /etc/iptables.rules
+        fi
+
+        cat > /etc/network/if-up.d/iptables <<EOF
+#!/bin/sh
+/sbin/iptables-restore < /etc/iptables.rules
+EOF
+        chmod +x /etc/network/if-up.d/iptables
+
+        if [ ! -f /etc/ipsec.d/cert9.db ]; then
+           echo > /var/tmp/libreswan-nss-pwd
+           certutil -N -f /var/tmp/libreswan-nss-pwd -d /etc/ipsec.d
+           rm -f /var/tmp/libreswan-nss-pwd
+        fi
+
+        update-rc.d -f xl2tpd defaults
+
+        cp -f /etc/rc.local /etc/rc.local.old.`date +%Y%m%d`
+        sed --follow-symlinks -i -e '/^exit 0/d' /etc/rc.local
+        cat >> /etc/rc.local <<EOF
+
+# Added by L2TP VPN script
+echo 1 > /proc/sys/net/ipv4/ip_forward
+/usr/sbin/service ipsec start
+exit 0
+EOF
+        chmod +x /etc/rc.local
+        echo 1 > /proc/sys/net/ipv4/ip_forward
+
+        /sbin/iptables-restore < /etc/iptables.rules
+        /usr/sbin/service ipsec start
+        /usr/sbin/service xl2tpd restart
+
+    fi
+
+}
+
+yum_install(){
+
+    config_install
+
+    cp -pf /etc/sysctl.conf /etc/sysctl.conf.bak
+
+    echo "# Added by L2TP VPN" >> /etc/sysctl.conf
+    echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
+    echo "net.ipv4.tcp_syncookies=1" >> /etc/sysctl.conf
+    echo "net.ipv4.icmp_echo_ignore_broadcasts=1" >> /etc/sysctl.conf
+    echo "net.ipv4.icmp_ignore_bogus_error_responses=1" >> /etc/sysctl.conf
+
+    for each in `ls /proc/sys/net/ipv4/conf/`; do
+        echo "net.ipv4.conf.${each}.accept_source_route=0" >> /etc/sysctl.conf
+        echo "net.ipv4.conf.${each}.accept_redirects=0" >> /etc/sysctl.conf
+        echo "net.ipv4.conf.${each}.send_redirects=0" >> /etc/sysctl.conf
+        echo "net.ipv4.conf.${each}.rp_filter=0" >> /etc/sysctl.conf
+    done
+    sysctl -p
+
+    cat > /etc/firewalld/services/xl2tpd.xml<<EOF
+<?xml version="1.0" encoding="utf-8"?>
+<service>
+  <short>xl2tpd</short>
+  <description>L2TP IPSec</description>
+  <port protocol="udp" port="4500"/>
+  <port protocol="udp" port="1701"/>
+</service>
+EOF
+    chmod 640 /etc/firewalld/services/xl2tpd.xml
+
+    systemctl enable ipsec
+    systemctl enable xl2tpd
+    systemctl enable firewalld
+
+    systemctl status firewalld > /dev/null 2>&1
+    if [ $? -eq 0 ]; then
+        firewall-cmd --reload
+        echo "Checking firewalld status..."
+        firewall-cmd --list-all
+        echo "add firewalld rules..."
+        firewall-cmd --permanent --add-service=ipsec
+        firewall-cmd --permanent --add-service=xl2tpd
+        firewall-cmd --permanent --add-masquerade
+        firewall-cmd --reload
+    else
+        echo "Firewalld looks like not running, trying to start..."
+        systemctl start firewalld
+        if [ $? -eq 0 ]; then
+            echo "Firewalld start successfully..."
+            firewall-cmd --reload
+            echo "Checking firewalld status..."
+            firewall-cmd --list-all
+            echo "adding firewalld rules..."
+            firewall-cmd --permanent --add-service=ipsec
+            firewall-cmd --permanent --add-service=xl2tpd
+            firewall-cmd --permanent --add-masquerade
+            firewall-cmd --reload
+        else
+            echo "Failed to start firewalld. please enable udp port 500 4500 1701 manually if necessary."
+        fi
+    fi
+
+    systemctl restart ipsec
+    systemctl restart xl2tpd
+    echo "Checking ipsec status..."
+    systemctl -a | grep ipsec
+    echo "Checking xl2tpd status..."
+    systemctl -a | grep xl2tpd
+    echo "Checking firewalld status..."
+    firewall-cmd --list-all
+
+}
+
+finally(){
+
+    cd ${cur_dir}
+    rm -fr ${cur_dir}/l2tp
+    # create l2tp command
+    cp -f ${cur_dir}/`basename $0` /usr/bin/l2tp
+
+    echo "Please wait a moment..."
+    sleep 5
+    ipsec verify
+    echo
+    echo "###############################################################"
+    echo "# L2TP VPN Auto Installer                                     #"
+    echo "# System Supported: CentOS 6+ / Debian 7+ / Ubuntu 12+        #"
+    echo "# Intro: https://teddysun.com/448.html                        #"
+    echo "# Author: Teddysun <i@teddysun.com>                           #"
+    echo "###############################################################"
+    echo "If there is no [FAILED] above, you can connect to your L2TP "
+    echo "VPN Server with the default Username/Password is below:"
+    echo
+    echo "Server IP: ${IP}"
+    echo "PSK      : ${mypsk}"
+    echo "Username : ${username}"
+    echo "Password : ${password}"
+    echo
+    echo "If you want to modify user settings, please use below command(s):"
+    echo "l2tp -a (Add a user)"
+    echo "l2tp -d (Delete a user)"
+    echo "l2tp -l (List all users)"
+    echo "l2tp -m (Modify a user password)"
+    echo
+    echo "Welcome to visit our website: https://teddysun.com/448.html"
+    echo "Enjoy it!"
+    echo
+}
+
+
+l2tp(){
+    clear
+    echo
+    echo "###############################################################"
+    echo "# L2TP VPN Auto Installer                                     #"
+    echo "# System Supported: CentOS 6+ / Debian 7+ / Ubuntu 12+        #"
+    echo "# Intro: https://teddysun.com/448.html                        #"
+    echo "# Author: Teddysun <i@teddysun.com>                           #"
+    echo "###############################################################"
+    echo
+    rootness
+    tunavailable
+    disable_selinux
+    version_check
+    get_os_info
+    preinstall_l2tp
+    install_l2tp
+    finally
+}
+
+list_users(){
+    if [ ! -f /etc/ppp/chap-secrets ];then
+        echo "Error: /etc/ppp/chap-secrets file not found."
+        exit 1
+    fi
+    local line="+-------------------------------------------+\n"
+    local string=%20s
+    printf "${line}|${string} |${string} |\n${line}" Username Password
+    grep -v "^#" /etc/ppp/chap-secrets | awk '{printf "|'${string}' |'${string}' |\n", $1,$3}'
+    printf ${line}
+}
+
+add_user(){
+    while :
+    do
+        read -p "Please input your Username:" user
+        if [ -z ${user} ]; then
+            echo "Username can not be empty"
+        else
+            grep -w "${user}" /etc/ppp/chap-secrets > /dev/null 2>&1
+            if [ $? -eq 0 ];then
+                echo "Username (${user}) already exists. Please re-enter your username."
+            else
+                break
+            fi
+        fi
+    done
+    pass=`rand`
+    echo "Please input ${user}'s password:"
+    read -p "(Default Password: ${pass}):" tmppass
+    [ ! -z ${tmppass} ] && pass=${tmppass}
+    echo "${user}    l2tpd    ${pass}       *" >> /etc/ppp/chap-secrets
+    echo "Username (${user}) add completed."
+}
+
+del_user(){
+    while :
+    do
+        read -p "Please input Username you want to delete it:" user
+        if [ -z ${user} ]; then
+            echo "Username can not be empty"
+        else
+            grep -w "${user}" /etc/ppp/chap-secrets >/dev/null 2>&1
+            if [ $? -eq 0 ];then
+                break
+            else
+                echo "Username (${user}) is not exists. Please re-enter your username."
+            fi
+        fi
+    done
+    sed -i "/^\<${user}\>/d" /etc/ppp/chap-secrets
+    echo "Username (${user}) delete completed."
+}
+
+mod_user(){
+    while :
+    do
+        read -p "Please input Username you want to change password:" user
+        if [ -z ${user} ]; then
+            echo "Username can not be empty"
+        else
+            grep -w "${user}" /etc/ppp/chap-secrets >/dev/null 2>&1
+            if [ $? -eq 0 ];then
+                break
+            else
+                echo "Username (${user}) is not exists. Please re-enter your username."
+            fi
+        fi
+    done
+    pass=`rand`
+    echo "Please input ${user}'s new password:"
+    read -p "(Default Password: ${pass}):" tmppass
+    [ ! -z ${tmppass} ] && pass=${tmppass}
+    sed -i "/^\<${user}\>/d" /etc/ppp/chap-secrets
+    echo "${user}    l2tpd    ${pass}       *" >> /etc/ppp/chap-secrets
+    echo "Username ${user}'s password has been changed."
+}
+
+# Main process
+action=$1
+if [ -z ${action} ] && [ "`basename $0`" != "l2tp" ]; then
+    action=install
+fi
+
+case ${action} in
+    install)
+        l2tp 2>&1 | tee ${cur_dir}/l2tp.log
+        ;;
+    -l|--list)
+        list_users
+        ;;
+    -a|--add)
+        add_user
+        ;;
+    -d|--del)
+        del_user
+        ;;
+    -m|--mod)
+        mod_user
+        ;;
+    -h|--help)
+        echo "Usage: `basename $0` -l,--list   List all users"
+        echo "       `basename $0` -a,--add    Add a user"
+        echo "       `basename $0` -d,--del    Delete a user"
+        echo "       `basename $0` -m,--mod    Modify a user password"
+        echo "       `basename $0` -h,--help   Print this help information"
+        ;;
+    *)
+        echo "Usage: `basename $0` [-l,--list|-a,--add|-d,--del|-m,--mod|-h,--help]" && exit
+        ;;
+esac