使用yum -y update升级

yum -y update 升级所有包，改变软件设置和系统设置,系统版本内核都升级

yum -y upgrade 升级所有包，不改变软件设置和系统设置，系统版本升级，内核不改变

升级过后安装VPN服务。

wget --no-check-certificate https://raw.githubusercontent.com/teddysun/across/master/l2tp.sh
chmod +x l2tp.sh
./l2tp.sh

ServerIP:139.162.60.187
PSK:test
Username:testuser
Password:testpsw

If you want to modify user settings, please use command(s):
l2tp -a (Add a user)
l2tp -d (Delete a user)
l2tp -l (List all users)
l2tp -m (Modify a user password)

Welcome to visit https://teddysun.com/448.html
Enjoy it!

[[email protected] ~]#

可以看到iptables: Setting chains to policy ACCEPT: security raw nat[FAILED]filter错误

iptables: Setting chains to policy ACCEPT: security raw nat[FAILED]filter
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Unloading modules:                               [  OK  ]
iptables: Applying firewall rules:                         [  OK  ]
Starting pluto IKE daemon for IPsec: Migrating NSS db to sql:/etc/ipsec.d
database already upgraded.
NSS upgrade complete

[[email protected] ~]# nano /etc/init.d/iptables

用nano使用control+w搜索$IPTABLES -t raw -P OUTPUT
在下面添加security代码段
                $IPTABLES -t raw -P PREROUTING $policy \
                    && $IPTABLES -t raw -P OUTPUT $policy \
                    || let ret+=1
                ;;
            security)
               $IPTABLES -t filter -P INPUT $policy \
                   && $IPTABLES -t filter -P OUTPUT $policy \
                   && $IPTABLES -t filter -P FORWARD $policy \
                   || let ret+=1
               ;;
            filter)
                $IPTABLES -t filter -P INPUT $policy \
                    && $IPTABLES -t filter -P OUTPUT $policy \
                    && $IPTABLES -t filter -P FORWARD $policy \

nano使用control+o保存，control+x退出。

重启iptables

[[email protected] ~]# service iptables restart
iptables: Setting chains to policy ACCEPT: security raw nat[ OK ]filter
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]

同时也可以安装PPTP的VPN

wget http://mirrors.linuxeye.com/scripts/vpn_centos.sh
chmod +x ./vpn_centos.sh
./vpn_centos.sh

如下情况已经配置成功。

iptables: Saving firewall rules to /etc/sysconfig/iptables:[  OK  ]
iptables: Setting chains to policy ACCEPT: security raw nat[  OK  ]filter
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Unloading modules:                               [  OK  ]
iptables: Applying firewall rules:                         [  OK  ]
Shutting down pptpd:                                       [FAILED]
Starting pptpd:                                            [  OK  ]
Warning: a pptpd restart does not terminate existing
connections, so new connections may be assigned the same IP
address and cause unexpected results.  Use restart-kill to
destroy existing connections during a restart.

You can now connect to your VPN via your external IP 139.162.xx.xxx
Username: testuser1
Password: testpsw
[[email protected] ~]#

添加用户：vim /etc/ppp/chap-secrets
# Secrets for authentication using CHAP
# client    server    secret    IP addresses
testuser    l2tpd    testpsw       *
testuser1 pptpd testpsw *
~
~
~
~
~
~
~
~
~
~
~
~
~
~
"/etc/ppp/chap-secrets" 4L, 148C

重启l2tp和pptp

[[email protected] ~]# /etc/init.d/xl2tpd restart
Stopping xl2tpd:                                           [  OK  ]
Starting xl2tpd:                                           [  OK  ]
[[email protected] ~]# /etc/init.d/pptpd restart
Shutting down pptpd:                                       [  OK  ]
Starting pptpd:                                            [  OK  ]
Warning: a pptpd restart does not terminate existing
connections, so new connections may be assigned the same IP
address and cause unexpected results.  Use restart-kill to
destroy existing connections during a restart.
[[email protected] ~]#

shadowsocks一键安装脚本，需使用root用户登录，运行以下命令

wget --no-check-certificate https://raw.githubusercontent.com/teddysun/shadowsocks_install/master/shadowsocks-libev.sh
chmod +x shadowsocks-libev.sh
./shadowsocks-libev.sh 2>&1 | tee shadowsocks-libev.log

安装完成后如下

Starting Shadowsocks-libev:                                [  OK  ]
Shadowsocks-libev start success!


Congratulations, Shadowsocks-libev install completed!
Your Server IP:  139.162.xx.xxx
Your Server Port:  8989
Your Password:  testpsw
Your Local IP:  127.0.0.1
Your Local Port:  1080
Your Encryption Method:  aes-256-cfb

Welcome to visit:https://teddysun.com/357.html
Enjoy it!