CentOS7部署l2tp/IPsec服务
1、安装必要的工具
yum install vim net-tools wget unzip -y
2. 下载安装脚本
wget -O StackScript.zip https://files.cnblogs.com/files/think8848/StackScript.zip
3. 解压文件
unzip StackScript.zip
4. 执行安装文件
chmod +x StackScript ./StackScript
StackScript实际上市判断你的系统版本，然后下载安装脚本执行安装，centos安装的脚本如下：
#!/bin/sh
#
# Script for automatic setup of an IPsec VPN server on CentOS/RHEL 6 and 7.
# Works on any dedicated server or virtual private server (VPS) except OpenVZ.
#
# DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!
#
# The latest version of this script is available at:
# https://github.com/hwdsl2/setup-ipsec-vpn
#
# Copyright (C) 2015-2017 Lin Song <linsongui@gmail.com>
# Based on the work of Thomas Sarlandie (Copyright 2012)
#
# This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
# Unported License: http://creativecommons.org/licenses/by-sa/3.0/
#
# Attribution required: please include my name in any derivative and let me
# know how you have improved it!
# =====================================================
# Define your own values for these variables
# - IPsec pre-shared key, VPN username and password
# - All values MUST be placed inside 'single quotes'
# - DO NOT use these special characters within values: \ " '
YOUR_IPSEC_PSK=''
YOUR_USERNAME=''
YOUR_PASSWORD=''
# Important notes: https://git.io/vpnnotes
# Setup VPN clients: https://git.io/vpnclients
# =====================================================
export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
SYS_DT="$(date +%F-%T)"
exiterr() { echo "Error: $1" >&2; exit 1; }
exiterr2() { exiterr "'yum install' failed."; }
conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
bigecho() { echo; echo "## $1"; echo; }
check_ip() {
IP_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
printf '%s' "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
}
vpnsetup() {
if ! grep -qs -e "release 6" -e "release 7" /etc/redhat-release; then
exiterr "This script only supports CentOS/RHEL 6 and 7."
fi
if [ -f /proc/user_beancounters ]; then
exiterr "OpenVZ VPS is not supported. Try OpenVPN: github.com/Nyr/openvpn-install"
fi
if [ "$(id -u)" != 0 ]; then
exiterr "Script must be run as root. Try 'sudo sh $0'"
fi
net_iface=${VPN_NET_IFACE:-'eth0'}
def_iface="$(route 2>/dev/null | grep '^default' | grep -o '[^ ]*$')"
[ -z "$def_iface" ] && def_iface="$(ip -4 route list 0/0 2>/dev/null | grep -Po '(?<=dev )(\S+)')"
def_iface_state=$(cat "/sys/class/net/$def_iface/operstate" 2>/dev/null)
if [ -n "$def_iface_state" ] && [ "$def_iface_state" != "down" ]; then
if ! grep -qs raspbian /etc/os-release; then
case "$def_iface" in
wl*)
exiterr "Wireless interface '$def_iface' detected. DO NOT run this script on your PC or Mac!"
;;
esac
fi
net_iface="$def_iface"
fi
net_iface_state=$(cat "/sys/class/net/$net_iface/operstate" 2>/dev/null)
if [ -z "$net_iface_state" ] || [ "$net_iface_state" = "down" ] || [ "$net_iface" = "lo" ]; then
printf "Error: Network interface '%s' is not available.\n" "$net_iface" >&2
if [ -z "$VPN_NET_IFACE" ]; then
cat 1>&2 <<EOF
Unable to detect the default network interface. Manually re-run this script with:
sudo VPN_NET_IFACE="your_default_interface_name" sh "$0"
EOF
fi
exit 1
fi
[ -n "$YOUR_IPSEC_PSK" ] && VPN_IPSEC_PSK="$YOUR_IPSEC_PSK"
[ -n "$YOUR_USERNAME" ] && VPN_USER="$YOUR_USERNAME"
[ -n "$YOUR_PASSWORD" ] && VPN_PASSWORD="$YOUR_PASSWORD"
if [ -z "$VPN_IPSEC_PSK" ] && [ -z "$VPN_USER" ] && [ -z "$VPN_PASSWORD" ]; then
bigecho "VPN credentials not set by user. Generating random PSK and password..."
VPN_IPSEC_PSK="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
VPN_USER=vpnuser
VPN_PASSWORD="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
fi
if [ -z "$VPN_IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
exiterr "All VPN credentials must be specified. Edit the script and re-enter them."
fi
if printf '%s' "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" | LC_ALL=C grep -q '[^ -~]\+'; then
exiterr "VPN credentials must not contain non-ASCII characters."
fi
case "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" in
*[\\\"\']*)
exiterr "VPN credentials must not contain these special characters: \\ \" '"
;;
esac
bigecho "VPN setup in progress... Please be patient."
# Create and change to working dir
mkdir -p /opt/src
cd /opt/src || exiterr "Cannot enter /opt/src."
bigecho "Installing packages required for setup..."
yum -y install wget bind-utils openssl \
iproute gawk grep sed net-tools || exiterr2
bigecho "Trying to auto discover IP of this server..."
cat <<'EOF'
In case the script hangs here for more than a few minutes,
press Ctrl-C to abort. Then edit it and manually enter IP.
EOF
# In case auto IP discovery fails, enter server's public IP here.
PUBLIC_IP=${VPN_PUBLIC_IP:-''}
# Try to auto discover IP of this server
[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
# Check IP for correct format
check_ip "$PUBLIC_IP" || PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
check_ip "$PUBLIC_IP" || exiterr "Cannot detect this server's public IP. Edit the script and manually enter it."
bigecho "Adding the EPEL repository..."
epel_url="https://dl.fedoraproject.org/pub/epel/epel-release-latest-$(rpm -E '%{rhel}').noarch.rpm"
yum -y install epel-release || yum -y install "$epel_url" || exiterr2
bigecho "Installing packages required for the VPN..."
yum -y install nss-devel nspr-devel pkgconfig pam-devel \
libcap-ng-devel libselinux-devel curl-devel \
flex bison gcc make ppp xl2tpd || exiterr2
OPT1='--enablerepo=*server-optional*'
OPT2='--enablerepo=*releases-optional*'
if grep -qs "release 6" /etc/redhat-release; then
yum -y remove libevent-devel
yum "$OPT1" "$OPT2" -y install libevent2-devel fipscheck-devel || exiterr2
else
yum -y install systemd-devel iptables-services || exiterr2
yum "$OPT1" "$OPT2" -y install libevent-devel fipscheck-devel || exiterr2
fi
bigecho "Installing Fail2Ban to protect SSH..."
yum -y install fail2ban || exiterr2
bigecho "Compiling and installing Libreswan..."
SWAN_VER=3.22
swan_file="libreswan-$SWAN_VER.tar.gz"
swan_url1="https://github.com/libreswan/libreswan/archive/v$SWAN_VER.tar.gz"
swan_url2="https://download.libreswan.org/$swan_file"
if ! { wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url2"; }; then
exiterr "Cannot download Libreswan source."
fi
/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
tar xzf "$swan_file" && /bin/rm -f "$swan_file"
cd "libreswan-$SWAN_VER" || exiterr "Cannot enter Libreswan source dir."
[ "$SWAN_VER" = "3.22" ] && sed -i '/^#define LSWBUF_CANARY/s/-2$/((char) -2)/' include/lswlog.h
cat > Makefile.inc.local <<'EOF'
WERROR_CFLAGS =
USE_DNSSEC = false
EOF
NPROCS="$(grep -c ^processor /proc/cpuinfo)"
[ -z "$NPROCS" ] && NPROCS=1
make "-j$((NPROCS+1))" -s base && make -s install-base
# Verify the install and clean up
cd /opt/src || exiterr "Cannot enter /opt/src."
/bin/rm -rf "/opt/src/libreswan-$SWAN_VER"
if ! /usr/local/sbin/ipsec --version 2>/dev/null | grep -qF "$SWAN_VER"; then
exiterr "Libreswan $SWAN_VER failed to build."
fi
bigecho "Creating VPN configuration..."
L2TP_NET=${VPN_L2TP_NET:-'192.168.42.0/24'}
L2TP_LOCAL=${VPN_L2TP_LOCAL:-'192.168.42.1'}
L2TP_POOL=${VPN_L2TP_POOL:-'192.168.42.10-192.168.42.250'}
XAUTH_NET=${VPN_XAUTH_NET:-'192.168.43.0/24'}
XAUTH_POOL=${VPN_XAUTH_POOL:-'192.168.43.10-192.168.43.250'}
DNS_SRV1=${VPN_DNS_SRV1:-'8.8.8.8'}
DNS_SRV2=${VPN_DNS_SRV2:-'8.8.4.4'}
# Create IPsec (Libreswan) config
conf_bk "/etc/ipsec.conf"
cat > /etc/ipsec.conf <<EOF
version 2.0
config setup
virtual-private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!$L2TP_NET,%v4:!$XAUTH_NET
protostack=netkey
interfaces=%defaultroute
uniqueids=no
conn shared
left=%defaultroute
leftid=$PUBLIC_IP
right=%any
encapsulation=yes
authby=secret
pfs=no
rekey=no
keyingtries=5
dpddelay=30
dpdtimeout=120
dpdaction=clear
ike=3des-sha1,3des-sha2,aes-sha1,aes-sha1;modp1024,aes-sha2,aes-sha2;modp1024,aes256-sha2_512
phase2alg=3des-sha1,3des-sha2,aes-sha1,aes-sha2,aes256-sha2_512
sha2-truncbug=yes
conn l2tp-psk
auto=add
leftprotoport=17/1701
rightprotoport=17/%any
type=transport
phase2=esp
also=shared
conn xauth-psk
auto=add
leftsubnet=0.0.0.0/0
rightaddresspool=$XAUTH_POOL
modecfgdns1=$DNS_SRV1
modecfgdns2=$DNS_SRV2
leftxauthserver=yes
rightxauthclient=yes
leftmodecfgserver=yes
rightmodecfgclient=yes
modecfgpull=yes
xauthby=file
ike-frag=yes
ikev2=never
cisco-unity=yes
also=shared
EOF
# Specify IPsec PSK
conf_bk "/etc/ipsec.secrets"
cat > /etc/ipsec.secrets <<EOF
%any %any : PSK "$VPN_IPSEC_PSK"
EOF
# Create xl2tpd config
conf_bk "/etc/xl2tpd/xl2tpd.conf"
cat > /etc/xl2tpd/xl2tpd.conf <<EOF
[global]
port = 1701
[lns default]
ip range = $L2TP_POOL
local ip = $L2TP_LOCAL
require chap = yes
refuse pap = yes
require authentication = yes
name = l2tpd
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes
EOF
# Set xl2tpd options
conf_bk "/etc/ppp/options.xl2tpd"
cat > /etc/ppp/options.xl2tpd <<EOF
+mschap-v2
ipcp-accept-local
ipcp-accept-remote
ms-dns $DNS_SRV1
ms-dns $DNS_SRV2
noccp
auth
mtu 1280
mru 1280
proxyarp
lcp-echo-failure 4
lcp-echo-interval 30
connect-delay 5000
EOF
# Create VPN credentials
conf_bk "/etc/ppp/chap-secrets"
cat > /etc/ppp/chap-secrets <<EOF
"$VPN_USER" l2tpd "$VPN_PASSWORD" *
EOF
conf_bk "/etc/ipsec.d/passwd"
VPN_PASSWORD_ENC=$(openssl passwd -1 "$VPN_PASSWORD")
cat > /etc/ipsec.d/passwd <<EOF
$VPN_USER:$VPN_PASSWORD_ENC:xauth-psk
EOF
bigecho "Updating sysctl settings..."
if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
conf_bk "/etc/sysctl.conf"
if [ "$(getconf LONG_BIT)" = "64" ]; then
SHM_MAX=68719476736
SHM_ALL=4294967296
else
SHM_MAX=4294967295
SHM_ALL=268435456
fi
cat >> /etc/sysctl.conf <<EOF
# Added by hwdsl2 VPN script
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = $SHM_MAX
kernel.shmall = $SHM_ALL
net.ipv4.ip_forward = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.all.rp_filter = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.$net_iface.send_redirects = 0
net.ipv4.conf.$net_iface.rp_filter = 0
net.core.wmem_max = 12582912
net.core.rmem_max = 12582912
net.ipv4.tcp_rmem = 10240 87380 12582912
net.ipv4.tcp_wmem = 10240 87380 12582912
EOF
fi
bigecho "Updating IPTables rules..."
# Check if IPTables rules need updating
ipt_flag=0
IPT_FILE="/etc/sysconfig/iptables"
if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE" \
|| ! iptables -t nat -C POSTROUTING -s "$L2TP_NET" -o "$net_iface" -j MASQUERADE 2>/dev/null \
|| ! iptables -t nat -C POSTROUTING -s "$XAUTH_NET" -o "$net_iface" -m policy --dir out --pol none -j MASQUERADE 2>/dev/null; then
ipt_flag=1
fi
# Add IPTables rules for VPN
if [ "$ipt_flag" = "1" ]; then
service fail2ban stop >/dev/null 2>&1
iptables-save > "$IPT_FILE.old-$SYS_DT"
iptables -I INPUT 1 -p udp --dport 1701 -m policy --dir in --pol none -j DROP
iptables -I INPUT 2 -m conntrack --ctstate INVALID -j DROP
iptables -I INPUT 3 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I INPUT 4 -p udp -m multiport --dports 500,4500 -j ACCEPT
iptables -I INPUT 5 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
iptables -I INPUT 6 -p udp --dport 1701 -j DROP
iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
iptables -I FORWARD 2 -i "$net_iface" -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 3 -i ppp+ -o "$net_iface" -j ACCEPT
iptables -I FORWARD 4 -i ppp+ -o ppp+ -s "$L2TP_NET" -d "$L2TP_NET" -j ACCEPT
iptables -I FORWARD 5 -i "$net_iface" -d "$XAUTH_NET" -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -I FORWARD 6 -s "$XAUTH_NET" -o "$net_iface" -j ACCEPT
# Uncomment if you wish to disallow traffic between VPN clients themselves
# iptables -I FORWARD 2 -i ppp+ -o ppp+ -s "$L2TP_NET" -d "$L2TP_NET" -j DROP
# iptables -I FORWARD 3 -s "$XAUTH_NET" -d "$XAUTH_NET" -j DROP
iptables -A FORWARD -j DROP
iptables -t nat -I POSTROUTING -s "$XAUTH_NET" -o "$net_iface" -m policy --dir out --pol none -j MASQUERADE
iptables -t nat -I POSTROUTING -s "$L2TP_NET" -o "$net_iface" -j MASQUERADE
echo "# Modified by hwdsl2 VPN script" > "$IPT_FILE"
iptables-save >> "$IPT_FILE"
fi
bigecho "Creating basic Fail2Ban rules..."
if [ ! -f /etc/fail2ban/jail.local ] ; then
cat > /etc/fail2ban/jail.local <<'EOF'
[ssh-iptables]
enabled = true
filter = sshd
action = iptables[name=SSH, port=ssh, protocol=tcp]
logpath = /var/log/secure
EOF
fi
bigecho "Enabling services on boot..."
if grep -qs "release 6" /etc/redhat-release; then
chkconfig iptables on
chkconfig fail2ban on
else
systemctl --now mask firewalld 2>/dev/null
systemctl enable iptables fail2ban 2>/dev/null
fi
if ! grep -qs "hwdsl2 VPN script" /etc/rc.local; then
if [ -f /etc/rc.local ]; then
conf_bk "/etc/rc.local"
else
echo '#!/bin/sh' > /etc/rc.local
fi
cat >> /etc/rc.local <<'EOF'
# Added by hwdsl2 VPN script
(sleep 15
modprobe -q pppol2tp
service ipsec restart
service xl2tpd restart
echo 1 > /proc/sys/net/ipv4/ip_forward)&
EOF
fi
bigecho "Starting services..."
# Restore SELinux contexts
restorecon /etc/ipsec.d/*db 2>/dev/null
restorecon /usr/local/sbin -Rv 2>/dev/null
restorecon /usr/local/libexec/ipsec -Rv 2>/dev/null
# Reload sysctl.conf
sysctl -e -q -p
# Update file attributes
chmod +x /etc/rc.local
chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets* /etc/ipsec.d/passwd*
# Apply new IPTables rules
iptables-restore < "$IPT_FILE"
# Fix xl2tpd on CentOS 7, if kernel module "l2tp_ppp" is unavailable
if grep -qs "release 7" /etc/redhat-release; then
if ! modprobe -q l2tp_ppp; then
sed -i '/^ExecStartPre/s/^/#/' /usr/lib/systemd/system/xl2tpd.service
systemctl daemon-reload
fi
fi
# Restart services
modprobe -q pppol2tp
service fail2ban restart 2>/dev/null
service ipsec restart 2>/dev/null
service xl2tpd restart 2>/dev/null
cat <<EOF
================================================
IPsec VPN server is now ready for use!
Connect to your new VPN with these details:
Server IP: $PUBLIC_IP
IPsec PSK: $VPN_IPSEC_PSK
Username: $VPN_USER
Password: $VPN_PASSWORD
Write these down. You'll need them to connect!
Important notes: https://git.io/vpnnotes
Setup VPN clients: https://git.io/vpnclients
================================================
EOF
}
## Defer setup until we have the complete script
vpnsetup "$@"
exit 0
5、安装完，会打印Server IP, IPseck PSK, Username, Password信息，我们可以换成自己配置的
//先修改PSK，将PSK后面的字符替换掉
vim /etc/ipsec.secrets
// 修改用户名和密码 ，将用户名和密码修改为自已想要的字符
vim /etc/ppp/chap-secrets
//重启IPsec和xl2tpd服务
systemctl restart ipsec xl2tpd
6、现在可以尝试连接vpn了，连接方法如下：
win10 and win8
右键单击系统托盘中的无线/网络图标。 选择打开网络和共享中心。 点击设置一个新的连接或网络。 选择连接到工作区，然后单击下一步。 单击使用我的Internet连接（VPN）。 Your VPN Server IP在Internet地址栏中输入。 在目的地名称字段中输入任何你喜欢的，然后点击创建。 返回到网络和共享中心。在左侧，点击更改适配器设置。 右键单击新的VPN条目，然后选择“ 属性”。 单击安全选项卡。选择“使用IPsec的第2层隧道协议（L2TP / IPSec）”作为VPN的类型。 点击允许这些协议。一定要选择“挑战握手认证协议（CHAP）”复选框。 点击高级设置按钮。 选择使用预共享密钥进行验证，并输入Your VPN IPsec PSK的关键。 单击确定关闭高级设置。 单击确定以保存VPN连接详细信息。
win7，vista和xp
点击开始菜单并进入控制面板。 转到网络和Internet部分。 点击网络和共享中心。 点击设置一个新的连接或网络。 选择连接到工作区，然后单击下一步。 单击使用我的Internet连接（VPN）。 Your VPN Server IP在Internet地址栏中输入。 在目的地名称字段中输入任何你喜欢的东西。 检查现在不要连接; 只需设置它，以便以后可以连接复选框。 点击下一步。 Your VPN Username在用户名字段中输入。 Your VPN Password在密码字段中输入。 选中记住此密码复选框。 点击创建，然后关闭。 返回到网络和共享中心。在左侧，点击更改适配器设置。 右键单击新的VPN条目，然后选择“ 属性”。 单击选项选项卡，并取消选中包括Windows登录域。 单击安全选项卡。选择“使用IPsec的第2层隧道协议（L2TP / IPSec）”作为VPN的类型。 点击允许这些协议。一定要选择“挑战握手认证协议（CHAP）”复选框。 点击高级设置按钮。 选择使用预共享密钥进行验证，并输入Your VPN IPsec PSK的关键。 单击确定关闭高级设置。 单击确定以保存VPN连接详细信息。
注意：如果连接不上，需要更改注册表，点击查看详细
在cmd命令行执行 //对于Windows Vista，7，8.x和10 REG ADD HKLM\SYSTEM\CurrentControlSet\Services\PolicyAgent /v AssumeUDPEncapsulationContextOnSendRule /t REG_DWORD /d 0x2 /f //仅适用于Windows XP REG ADD HKLM\SYSTEM\CurrentControlSet\Services\IPSec /v AssumeUDPEncapsulationContextOnSendRule /t REG_DWORD /d 0x2 /f //虽然不常见，但某些Windows系统禁用IPsec加密，导致连接失败。要重新启用它，请运行以下命令并重新启动您的PC REG ADD HKLM\SYSTEM\CurrentControlSet\Services\RasMan\Parameters /v ProhibitIpSec /t REG_DWORD /d 0x0 /f
OS X
打开系统偏好设置并转到网络部分。 点击窗口左下角的+按钮。 从“ 接口”下拉菜单中选择“ VPN ” 。 从“ VPN类型”下拉菜单中选择“ IPSec上的L2TP”。 输入你喜欢的服务名称。 点击创建。 输入Your VPN Server IP的服务器地址。 输入Your VPN Username的帐户名称。 点击认证设置按钮。 在“ 用户验证”部分中，选择“ 密码”单选按钮并进入Your VPN Password。 在“ 机器验证”部分中，选择“ 共享机密”单选按钮并进入Your VPN IPsec PSK。 点击OK。 选中菜单栏中显示VPN状态复选框。 单击“ 高级”按钮，确保选中“ 发送所有通过VPN连接的通信”复选框。 单击“ TCP / IP”选项卡，并确保“ 配置IPv6”部分中的“ 仅限本地链接”。 单击确定关闭高级设置，然后单击应用以保存VPN连接信息。
Android
启动设置应用程序。 点击无线和网络部分中的更多...。 点击VPN。 点击添加VPN配置文件或屏幕右上方的+图标。 在名称字段中输入您喜欢的任何内容。 在类型下拉菜单中选择L2TP / IPSec PSK。 Your VPN Server IP在服务器地址栏中输入。 输入Your VPN IPsec PSK的预共享的IPSec密钥场。 点按保存。 点击新的VPN连接。 Your VPN Username在用户名字段中输入。 Your VPN Password在密码字段中输入。 选中保存帐户信息复选框。 点击连接。
ios
进入设置 - >常规 - > VPN。 点击添加VPN配置...。 点按类型。选择L2TP并返回。 点按“ 说明”，然后输入您喜欢 点击服务器并输入Your VPN Server IP。 点击帐户并输入Your VPN Username。 点击密码并输入Your VPN Password。 点击秘密并进入Your VPN IPsec PSK。 确保发送所有通信开关打开。 点按完成。 滑动VPN开关。
Linux
#####要设置VPN客户端，请首先安装以下软件包#### # Ubuntu & Debian apt-get update apt-get -y install strongswan xl2tpd # CentOS & RHEL yum -y install epel-release yum -y install strongswan xl2tpd # Fedora yum -y install strongswan xl2tpd #####创建VPN变量（用实际值替换）#### VPN_SERVER_IP='your_vpn_server_ip' VPN_IPSEC_PSK='your_ipsec_pre_shared_key' VPN_USER='your_vpn_username' VPN_PASSWORD='your_vpn_password' #####配置strongSwan##### cat > /etc/ipsec.conf <<EOF # ipsec.conf - strongSwan IPsec configuration file # basic configuration config setup # strictcrlpolicy=yes # uniqueids = no # Add connections here. # Sample VPN connections conn %default ikelifetime=60m keylife=20m rekeymargin=3m keyingtries=1 keyexchange=ikev1 authby=secret ike=aes128-sha1-modp1024,3des-sha1-modp1024! esp=aes128-sha1-modp1024,3des-sha1-modp1024! conn myvpn keyexchange=ikev1 left=%defaultroute auto=add authby=secret type=transport leftprotoport=17/1701 rightprotoport=17/1701 right=$VPN_SERVER_IP EOF cat > /etc/ipsec.secrets <<EOF : PSK "$VPN_IPSEC_PSK" EOF chmod 600 /etc/ipsec.secrets # For CentOS/RHEL & Fedora ONLY mv /etc/strongswan/ipsec.conf /etc/strongswan/ipsec.conf.old 2>/dev/null mv /etc/strongswan/ipsec.secrets /etc/strongswan/ipsec.secrets.old 2>/dev/null ln -s /etc/ipsec.conf /etc/strongswan/ipsec.conf ln -s /etc/ipsec.secrets /etc/strongswan/ipsec.secrets #####Configure xl2tpd##### cat > /etc/xl2tpd/xl2tpd.conf <<EOF [lac myvpn] lns = $VPN_SERVER_IP ppp debug = yes pppoptfile = /etc/ppp/options.l2tpd.client length bit = yes EOF cat > /etc/ppp/options.l2tpd.client <<EOF ipcp-accept-local ipcp-accept-remote refuse-eap require-chap noccp noauth mtu 1280 mru 1280 noipdefault defaultroute usepeerdns connect-delay 5000 name $VPN_USER password $VPN_PASSWORD EOF chmod 600 /etc/ppp/options.l2tpd.client VPN客户端设置现在完成。按照以下步骤进行连接。 注意：每次尝试连接到VPN时都必须重复以下所有步骤 ###创建xl2tpd控制文件：### mkdir -p /var/run/xl2tpd touch /var/run/xl2tpd/l2tp-control ###重新启动服务### service strongswan restart service xl2tpd restart ###启动IPsec连接### # Ubuntu & Debian ipsec up myvpn # CentOS/RHEL & Fedora strongswan up myvpn ###启动L2TP连接### echo "c myvpn" > /var/run/xl2tpd/l2tp-control 运行ifconfig并检查输出。你现在应该看到一个新的界面ppp0 检查您现有的默认路由 ip route 在输出中找到这一行：default via X.X.X.X ...。写下这个网关IP，用于下面的两个命令 从新的默认路由中排除您的VPN服务器的IP（用实际值替换） route add YOUR_VPN_SERVER_IP gw X.X.X.X 如果您的VPN客户端是远程服务器，则还必须从新的默认路由中排除本地PC的公共IP，以防止您的SSH会话被断开（用实际值替换）： route add YOUR_LOCAL_PC_PUBLIC_IP gw X.X.X.X 添加一个新的默认路由，以开始通过VPN服务器路由流量： route add default dev ppp0 VPN连接现在完成。确认您的流量正在正确路由： wget -qO- http://ipv4.icanhazip.com; echo 上述命令应该返回Your VPN Server IP 要通过VPN服务器停止路由流量 route del default dev ppp0 断开连接 # Ubuntu & Debian echo "d myvpn" > /var/run/xl2tpd/l2tp-control ipsec down myvpn # CentOS/RHEL & Fedora echo "d myvpn" > /var/run/xl2tpd/l2tp-control strongswan down myvpn
7、这一个帐户明显不够用了，所以还是要找如何能多人共享方法，经过一阵折腾，终于找到方法了
1. 在 /etc/ppp/chap-secrets 中添加第二个用户，格式为： "username" l2tpd "password" * 2. 执行 openssl passwd -1 "password" 得到一串MD5加密的字符串，如： $1$5NwpneO7$YD82DhVJxCQpQ4zahB1N01 3. 复制这一段字符串到 /etc/ipsec.d/passwd 中，新行如下： username:$1$5NwpneO7$YD82DhVJxCQpQ4zahB1N01:xauth-psk ，红色是手工添加的。 4. systemctl restart ipsec xl2tpd
8、vpn使用的端口，注意开放
(注意是：udp):500， 4500， 1701
9、这个脚本安装vpn的时候会添加很多iptables的规则，然而我并没有用它的规则，因为进入文件/etc/sysconfig/iptables,把里面的内容删除了
，然后自己添加一条规则
iptables -t nat -A POSTROUTING -s 192.168.42.0/24 -o eth0 -j MASQUERADE
如果不添加这条规则，会导致客户端连接vpn 之后无法连接外网，加上后，客户单会通过vpn 服务器连接外网
每天进步一点，加油!
