记录湖北云计算中心日常工作关于系统运维,虚拟化云计算,数据库,网络安全等各方面问题。
一、安装openvpn

    1.更新软件包
        yum -y update
    2.安装epel扩展源
        yum -y install epel-release
    3.安装openvpn和easy-rsa
        yum -y install gcc gcc-c++ autoconf automake libtool gettext lzo lzo-devel pam-devel
        yum -y install openvpn easy-rsa
    4.复制easy-rsa文件
        [root@localhost ~]# cp -r /usr/share/easy-rsa/ /etc/openvpn/easy-rsa
        [root@localhost ~]# cp /usr/share/doc/openvpn-2.4.7/sample/sample-config-files/server.conf /etc/openvpn
        [root@localhost ~]# cd /etc/openvpn/easy-rsa/
        [root@localhost easy-rsa]# \rm 3 3.0
        [root@localhost easy-rsa]# cd 3.0.6/
        [root@localhost 3.0.6]# find / -type f -name "vars.example" | xargs -i cp {} . && mv vars.example vars

二、生成CA证书

    1.创建一个新的 PKI 和 CA
    [root@localhost 3.0.6]# ./easyrsa init-pki
    2.创建新的CA,不使用密码
    [root@localhost 3.0.6]# ./easyrsa build-ca nopass
     
    ########################### 生成信息 ###########################
     
    Note: using Easy-RSA configuration from: ./vars
    Generating a 2048 bit RSA private key
    ......................+++
    ................................................+++
    writing new private key to '/etc/openvpn/easy-rsa/3.0.6/pki/private/ca.key.pClvaQ1GLD'
    -----
    You are about to be asked to enter information that will be incorporated
    into your certificate request.
    What you are about to enter is what is called a Distinguished Name or a DN.
    There are quite a few fields but you can leave some blank
    For some fields there will be a default value,
    If you enter '.', the field will be left blank.
    -----
    Common Name (eg: your user, host, or server name) [Easy-RSA CA]: 回车
     
    CA creation complete and you may now import and sign cert requests.
    Your new CA certificate file for publishing is at:
    /etc/openvpn/easy-rsa/3.0.6/pki/ca.crt
     
    ########################### 生成信息 ###########################

三、创建服务端证书

    1.创建服务端证书
    [root@localhost 3.0.6]# ./easyrsa gen-req server nopass
     
    ########################### 生成信息 ###########################
     
    Note: using Easy-RSA configuration from: ./vars
    Generating a 2048 bit RSA private key
    ...........................+++
    ..............................................................................+++
    writing new private key to '/etc/openvpn/easy-rsa/3.0.6/pki/private/server.key.wy7Q0fuG6A'
    -----
    You are about to be asked to enter information that will be incorporated
    into your certificate request.
    What you are about to enter is what is called a Distinguished Name or a DN.
    There are quite a few fields but you can leave some blank
    For some fields there will be a default value,
    If you enter '.', the field will be left blank.
    -----
    Common Name (eg: your user, host, or server name) [server]: 回车
     
    Keypair and certificate request completed. Your files are:
    req: /etc/openvpn/easy-rsa/3.0.6/pki/reqs/server.req
    key: /etc/openvpn/easy-rsa/3.0.6/pki/private/server.key
     
    ########################### 生成信息 ###########################
     
    2.签约服务端证书
    [root@localhost 3.0.6]# ./easyrsa sign server server
     
    ########################### 生成信息 ###########################
     
    Note: using Easy-RSA configuration from: ./vars
    You are about to sign the following certificate.
    Please check over the details shown below for accuracy. Note that this request
    has not been cryptographically verified. Please be sure it came from a trusted
    source or that you have verified the request checksum with the sender.
     
    Request subject, to be signed as a server certificate for 3650 days:
     
    subject=
        commonName                = server
     
    Type the word 'yes' to continue, or any other input to abort.
      Confirm request details: yes
    Using configuration from ./openssl-1.0.cnf
    Check that the request matches the signature
    Signature ok
    The Subject Distinguished Name is as follows
    commonName            :ASN.1 12:'server'
    Certificate is to be certified until Apr  7 14:54:08 2028 GMT (3650 days)
     
    Write out database with 1 new entries
    Data Base Updated
     
    Certificate created at: /etc/openvpn/easy-rsa/3.0.6/pki/issued/server.crt
     
    ########################### 生成信息 ###########################
     
    3.创建 Diffie-Hellman
    [root@localhost 3.0.6]# ./easyrsa gen-dh
    ............................................................
    DH parameters of size 2048 created at /etc/openvpn/easy-rsa/3.0.6/pki/dh.pem
     
    4.整理证书
    [root@localhost ~]# cd /etc/openvpn
    [root@localhost openvpn]# cp easy-rsa/3.0.6/pki/dh.pem .        
    [root@localhost openvpn]# cp easy-rsa/3.0.6/pki/ca.crt .
    [root@localhost openvpn]# cp easy-rsa/3.0.6/pki/issued/server.crt .
    [root@localhost openvpn]# cp easy-rsa/3.0.6/pki/private/server.key .

四、创建客户端证书

    1.复制文件
    [root@localhost ~]# cp -r /usr/share/easy-rsa/ /etc/openvpn/client
    [root@localhost ~]# cd /etc/openvpn/client/easy-rsa/
    [root@localhost easy-rsa]# \rm 3 3.0
    [root@localhost easy-rsa]# cd 3.0.6/
    [root@localhost 3.0.6]# find / -type f -name "vars.example" | xargs -i cp {} . && mv vars.example vars
     
    2.生成客户端证书
    [root@localhost 3.0.6]# ./easyrsa init-pki #创建新的pki
     
    ########################### 生成信息 ###########################
     
    Note: using Easy-RSA configuration from: ./vars
     
    init-pki complete; you may now create a CA or requests.
    Your newly created PKI dir is: /etc/openvpn/client/easy-rsa/3.0.6/pki
    [root@localhost 3.0.6]# ./easyrsa gen-req client nopass      #客户证书名,无密码
     
    Note: using Easy-RSA configuration from: ./vars
    Generating a 2048 bit RSA private key
    ....................................................+++
    ............+++
    writing new private key to '/etc/openvpn/client/easy-rsa/3.0.6/pki/private/client.key.FkrLzXH9Bm'
    -----
    You are about to be asked to enter information that will be incorporated
    into your certificate request.
    What you are about to enter is what is called a Distinguished Name or a DN.
    There are quite a few fields but you can leave some blank
    For some fields there will be a default value,
    If you enter '.', the field will be left blank.
    -----
    Common Name (eg: your user, host, or server name) [client]: 回车
     
    Keypair and certificate request completed. Your files are:
    req: /etc/openvpn/client/easy-rsa/3.0.6/pki/reqs/client.req
    key: /etc/openvpn/client/easy-rsa/3.0.6/pki/private/client.key
     
    ########################### 生成信息 ###########################
     
    3.签约客户端证书
    [root@localhost 3.0.6]# cd /etc/openvpn/easy-rsa/3.0.6/
    [root@localhost 3.0.6]# pwd
    /etc/openvpn/easy-rsa/3.0.6
    [root@localhost 3.0.6]# ./easyrsa import-req /etc/openvpn/client/easy-rsa/3.0.6/pki/reqs/client.req client
     
    ########################### 生成信息 ###########################
     
    Note: using Easy-RSA configuration from: ./vars
     
    The request has been successfully imported with a short name of: client
    You may now use this name to perform signing operations on this request.
     
    
    [root@localhost 3.0.6]# ./easyrsa sign client client
     
    Note: using Easy-RSA configuration from: ./vars
     
     
    You are about to sign the following certificate.
    Please check over the details shown below for accuracy. Note that this request
    has not been cryptographically verified. Please be sure it came from a trusted
    source or that you have verified the request checksum with the sender.
     
    Request subject, to be signed as a client certificate for 3650 days:
     
    subject=
        commonName                = client
     
     
    Type the word 'yes' to continue, or any other input to abort.
      Confirm request details: yes
    Using configuration from ./openssl-1.0.cnf
    Check that the request matches the signature
    Signature ok
    The Subject Distinguished Name is as follows
    commonName            :ASN.1 12:'client'
    Certificate is to be certified until Apr  8 01:54:57 2028 GMT (3650 days)
     
    Write out database with 1 new entries
    Data Base Updated
     
    Certificate created at: /etc/openvpn/easy-rsa/3.0.6/pki/issued/client.crt
     
    ########################### 生成信息 ###########################
     
    4.整理证书
    [root@localhost 3.0.6]# cd /etc/openvpn/client
    [root@localhost client]# cp /etc/openvpn/easy-rsa/3.0.6/pki/ca.crt .
    [root@localhost client]# cp /etc/openvpn/easy-rsa/3.0.6/pki/issued/client.crt .
    [root@localhost client]# cp /etc/openvpn/client/pki/private/client.key .

五、配置文件

    1.服务器配置文件
    [root@localhost ~]# vi /etc/openvpn/server.conf
     
    ########################### 配置信息 ###########################
    port 1194
    proto udp
    dev tun
    ca /etc/openvpn/ca.crt
    cert /etc/openvpn/server.crt
    key /etc/openvpn/server.key
    dh /etc/openvpn/dh.pem     
    ifconfig-pool-persist /etc/openvpn/ipp.txt     
    server 10.8.0.0 255.255.255.0
    push "route 10.8.0.0 255.255.255.0"
    push "redirect-gateway def1 bypass-dhcp"
    push "dhcp-option DNS 114.114.114.114"
    push "dhcp-option DNS 8.8.8.8"
    client-to-client
     
    keepalive 20 120
    comp-lzo
     
    user openvpn
    group openvpn
     
    persist-key
    persist-tun
    status      openvpn-status.log
    log-append  openvpn.log
    verb 1
    mute 20
    ########################### 配置信息 ###########################
     

    2.客户端windows7配置文件


  下载客户端软件地址:https://www.techspot.com/downloads/5182-openvpn.html#download_scroll

    [root@localhost ~]# D:\Program Files\OpenVPN\config\cilent.ovpn
     
    ########################### 配置信息 ###########################
    client
    remote 114.55.242.202 1194
    proto udp
    dev tun
    ;comp-lzo
    ca ca.crt
    cert client.crt
    key client.key
    route-delay 2
    route-method exe
    redirect-gateway def1
    dhcp-option DNS 114.114.114.114
    dhcp-option DNS 8.8.8.8
    verb 1
    ########################### 配置信息 ###########################

六、启动OpenVPN和端口转发

    开启端口
      157  iptables -I INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
      159  iptables -A INPUT -p udp -m state --state NEW -m udp --dport 1194 -j ACCEPT
      163  iptables -t nat -A POSTROUTING -s 10.8.0.0/24  -j MASQUERADE
      164  iptables -nL
      165  service iptables save

    5.开启转发
        [root@openvpn ~]# vi /etc/sysctl.conf
        net.ipv4.ip_forward = 1
        [root@openvpn ~]# sysctl -p

七、开机启动

  172  chkconfig iptables on
  173  chkconfig openvpn on
  174  service openvpn start




    1  yum -y install gcc gcc-c++ autoconf automake libtool gettext lzo lzo-devel pam-devel
    2  yum -y install openvpn easy-rsa
    3   cp /usr/share/doc/openvpn-2.3.2/sample/sample-config-files/server.conf /etc/openvpn
    4   cp /usr/share/doc/openvpn-2.4.7/sample/sample-config-files/server.conf /etc/openvpn
    5   cd /etc/openvpn/easy-rsa/2.0/
    6   cd /etc/openvpn/easy-rsa/3
    7  ls
    8  cd easyrsa
    9  cd ..
   10  ls
   11  cd 3.0
   12  ls
   13  cd ..
   14  ls
   15  cd 3.0.6/
   16  ls
   17  cat easyrsa
   18  cd /etc/openvpn/
   19  ls
   20  cd easy-rsa/
   21  ls
   22  cd 3
   23  ls
   24  yum install easy-rsa*
   25  yum list easy-rsa*
   26  ls
   27  find / -type f -name "vars.example" | xargs -i cp {} . && mv vars.example vars
   28  ls
   29  vi vars
   30  ./easyrsa init-pki
   31  pwd
   32  ./easyrsa build-ca nopass
   33  ./easyrsa gen-req server nopass
   34  ./easyrsa sign server server
   35  ./easyrsa gen-dh
   36  cd ..
   37  ls
   38  cd ..
   39  ls
   40  cp easy-rsa/3/pki/dh.pem .
   41  cp easy-rsa/3/pki/ca.crt .
   42  cp easy-rsa/3/pki/issued/server.crt .
   43  cp easy-rsa/3/pki/private/server.key .
   44  cp -r /usr/share/easy-rsa/3/ /etc/openvpn/client
   45  cd /etc/openvpn/client/easyrsa
   46  cd /etc/openvpn/client/
   47  find / -type f -name "vars.example" | xargs -i cp {} . && mv vars.example vars
   48  ./easyrsa init-pki
   49  ./easyrsa gen-req client nopass
   50  cd /etc/openvpn/easy-rsa/3/
   51  pwd
   52  ./easyrsa import-req /etc/openvpn/client/pki/reqs/client.req client
   53  ./easyrsa sign client client
   54  cd /etc/openvpn/client/
   55  cp /etc/openvpn/easy-rsa/3/pki/ca.crt .
   56  cp /etc/openvpn/easy-rsa/3/pki/issued/client.crt .
   57  cp /etc/openvpn/client/pki/private/client.key .
   58  vi ../server.conf

   89  yum -y install gcc gcc-c++ autoconf automake libtool gettext lzo lzo-devel pam-devel
   90  yum -y install openvpn easy-rsa
   91   cp /usr/share/doc/openvpn-2.3.2/sample/sample-config-files/server.conf /etc/openvpn
   92   cp /usr/share/doc/openvpn-2.4.7/sample/sample-config-files/server.conf /etc/openvpn
   93   cd /etc/openvpn/easy-rsa/2.0/
   94   cd /etc/openvpn/easy-rsa/3
   95  ls
   96  cd easyrsa
  103  cd 3.0.6/
  104  ls
  105  cat easyrsa
  106  cd /etc/openvpn/
  107  ls
  108  cd easy-rsa/
  109  ls
  110  cd 3.0.6


  115  find / -type f -name "vars.example" | xargs -i cp {} . && mv vars.example vars
  116  ls
  117  vi vars
  118  ./easyrsa init-pki
  119  pwd
  120  ./easyrsa build-ca nopass
  121  ./easyrsa gen-req server nopass
  122  ./easyrsa sign server server
  123  ./easyrsa gen-dh
  124  cd ..
  125  ls
  126  cd ..
  127  ls
  128  cp easy-rsa/3/pki/dh.pem .
  129  cp easy-rsa/3/pki/ca.crt .
  130  cp easy-rsa/3/pki/issued/server.crt .
  131  cp easy-rsa/3/pki/private/server.key .
  132  cp -r /usr/share/easy-rsa/3/ /etc/openvpn/client
  133  cd /etc/openvpn/client/easyrsa
  134  cd /etc/openvpn/client/
  135  find / -type f -name "vars.example" | xargs -i cp {} . && mv vars.example vars
  136  ./easyrsa init-pki
  137  ./easyrsa gen-req client nopass
  138  cd /etc/openvpn/easy-rsa/3/
  139  pwd
  140  ./easyrsa import-req /etc/openvpn/client/pki/reqs/client.req client
  141  ./easyrsa sign client client
  142  cd /etc/openvpn/client/
  143  cp /etc/openvpn/easy-rsa/3/pki/ca.crt .
  144  cp /etc/openvpn/easy-rsa/3/pki/issued/client.crt .
  145  cp /etc/openvpn/client/pki/private/client.key .


  147  service iptables start
  148  service iptables restart
  157   iptables -I INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
  158  iptables -nL
  159  iptables -A INPUT -p udp -m state --state NEW -m udp --dport 1194 -j ACCEPT
  163  iptables -t nat -A POSTROUTING -s 10.8.0.0/24  -j MASQUERADE
  164  iptables -nL
  165  service iptables save
  166  iptables -t nat -nL
 
  167  vi /etc/sysctl.conf
  168  sysctl -p
  169  sysctl -a |grep forward
  170  cd /etc/init.d/
  171  ls
  172  chkconfig iptables on
  173  chkconfig openvpn on
  174  service openvpn start




最后附上服务器端配置文件:


#################################################
# Sample OpenVPN 2.0 config file for            #
# multi-client server.                          #
#                                               #
# This file is for the server side              #
# of a many-clients <-> one-server              #
# OpenVPN configuration.                        #
#                                               #
# OpenVPN also supports                         #
# single-machine <-> single-machine             #
# configurations (See the Examples page         #
# on the web site for more info).               #
#                                               #
# This config should work on Windows            #
# or Linux/BSD systems.  Remember on            #
# Windows to quote pathnames and use            #
# double backslashes, e.g.:                     #
# "C:\\Program Files\\OpenVPN\\config\\foo.key" #
#                                               #
# Comments are preceded with '#' or ';'         #
#################################################

# Which local IP address should OpenVPN
# listen on? (optional)
;local a.b.c.d

# Which TCP/UDP port should OpenVPN listen on?
# If you want to run multiple OpenVPN instances
# on the same machine, use a different port
# number for each one.  You will need to
# open up this port on your firewall.
port 1194

# TCP or UDP server?
;proto tcp
proto udp

# "dev tun" will create a routed IP tunnel,
# "dev tap" will create an ethernet tunnel.
# Use "dev tap0" if you are ethernet bridging
# and have precreated a tap0 virtual interface
# and bridged it with your ethernet interface.
# If you want to control access policies
# over the VPN, you must create firewall
# rules for the the TUN/TAP interface.
# On non-Windows systems, you can give
# an explicit unit number, such as tun0.
# On Windows, use "dev-node" for this.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
;dev tap
dev tun

# Windows needs the TAP-Win32 adapter name
# from the Network Connections panel if you
# have more than one.  On XP SP2 or higher,
# you may need to selectively disable the
# Windows firewall for the TAP adapter.
# Non-Windows systems usually don't need this.
;dev-node MyTap

# SSL/TLS root certificate (ca), certificate
# (cert), and private key (key).  Each client
# and the server must have their own cert and
# key file.  The server and all clients will
# use the same ca file.
#
# See the "easy-rsa" directory for a series
# of scripts for generating RSA certificates
# and private keys.  Remember to use
# a unique Common Name for the server
# and each of the client certificates.
#
# Any X509 key management system can be used.
# OpenVPN can also use a PKCS #12 formatted key file
# (see "pkcs12" directive in man page).
ca /etc/openvpn/ca.crt
cert /etc/openvpn/server.crt
key /etc/openvpn/server.key  # This file should be kept secret

# Diffie hellman parameters.
# Generate your own with:
#   openssl dhparam -out dh2048.pem 2048
dh /etc/openvpn/dh.pem

# Network topology
# Should be subnet (addressing via IP)
# unless Windows clients v2.0.9 and lower have to
# be supported (then net30, i.e. a /30 per client)
# Defaults to net30 (not recommended)
;topology subnet

# Configure server mode and supply a VPN subnet
# for OpenVPN to draw client addresses from.
# The server will take 10.8.0.1 for itself,
# the rest will be made available to clients.
# Each client will be able to reach the server
# on 10.8.0.1. Comment this line out if you are
# ethernet bridging. See the man page for more info.
server 10.8.0.0 255.255.255.0
push "route 10.8.0.0 255.255.255.0"
push "redirect-gateway def1 bypass-dhcp"
push "dhcp-option DNS 114.114.114.114"
push "dhcp-option DNS 8.8.8.8"

# Maintain a record of client <-> virtual IP address
# associations in this file.  If OpenVPN goes down or
# is restarted, reconnecting clients can be assigned
# the same virtual IP address from the pool that was
# previously assigned.
ifconfig-pool-persist /etc/openvpn/ipp.txt

# Configure server mode for ethernet bridging.
# You must first use your OS's bridging capability
# to bridge the TAP interface with the ethernet
# NIC interface.  Then you must manually set the
# IP/netmask on the bridge interface, here we
# assume 10.8.0.4/255.255.255.0.  Finally we
# must set aside an IP range in this subnet
# (start=10.8.0.50 end=10.8.0.100) to allocate
# to connecting clients.  Leave this line commented
# out unless you are ethernet bridging.
;server-bridge 10.8.0.4 255.255.255.0 10.8.0.50 10.8.0.100

# Configure server mode for ethernet bridging
# using a DHCP-proxy, where clients talk
# to the OpenVPN server-side DHCP server
# to receive their IP address allocation
# and DNS server addresses.  You must first use
# your OS's bridging capability to bridge the TAP
# interface with the ethernet NIC interface.
# Note: this mode only works on clients (such as
# Windows), where the client-side TAP adapter is
# bound to a DHCP client.
;server-bridge

# Push routes to the client to allow it
# to reach other private subnets behind
# the server.  Remember that these
# private subnets will also need
# to know to route the OpenVPN client
# address pool (10.8.0.0/255.255.255.0)
# back to the OpenVPN server.
;push "route 192.168.10.0 255.255.255.0"
;push "route 192.168.20.0 255.255.255.0"

# To assign specific IP addresses to specific
# clients or if a connecting client has a private
# subnet behind it that should also have VPN access,
# use the subdirectory "ccd" for client-specific
# configuration files (see man page for more info).

# EXAMPLE: Suppose the client
# having the certificate common name "Thelonious"
# also has a small subnet behind his connecting
# machine, such as 192.168.40.128/255.255.255.248.
# First, uncomment out these lines:
;client-config-dir ccd
;route 192.168.40.128 255.255.255.248
# Then create a file ccd/Thelonious with this line:
#   iroute 192.168.40.128 255.255.255.248
# This will allow Thelonious' private subnet to
# access the VPN.  This example will only work
# if you are routing, not bridging, i.e. you are
# using "dev tun" and "server" directives.

# EXAMPLE: Suppose you want to give
# Thelonious a fixed VPN IP address of 10.9.0.1.
# First uncomment out these lines:
;client-config-dir ccd
;route 10.9.0.0 255.255.255.252
# Then add this line to ccd/Thelonious:
#   ifconfig-push 10.9.0.1 10.9.0.2

# Suppose that you want to enable different
# firewall access policies for different groups
# of clients.  There are two methods:
# (1) Run multiple OpenVPN daemons, one for each
#     group, and firewall the TUN/TAP interface
#     for each group/daemon appropriately.
# (2) (Advanced) Create a script to dynamically
#     modify the firewall in response to access
#     from different clients.  See man
#     page for more info on learn-address script.
;learn-address ./script

# If enabled, this directive will configure
# all clients to redirect their default
# network gateway through the VPN, causing
# all IP traffic such as web browsing and
# and DNS lookups to go through the VPN
# (The OpenVPN server machine may need to NAT
# or bridge the TUN/TAP interface to the internet
# in order for this to work properly).
;push "redirect-gateway def1 bypass-dhcp"

# Certain Windows-specific network settings
# can be pushed to clients, such as DNS
# or WINS server addresses.  CAVEAT:
# http://openvpn.net/faq.html#dhcpcaveats
# The addresses below refer to the public
# DNS servers provided by opendns.com.
;push "dhcp-option DNS 208.67.222.222"
;push "dhcp-option DNS 208.67.220.220"

# Uncomment this directive to allow different
# clients to be able to "see" each other.
# By default, clients will only see the server.
# To force clients to only see the server, you
# will also need to appropriately firewall the
# server's TUN/TAP interface.
client-to-client

# Uncomment this directive if multiple clients
# might connect with the same certificate/key
# files or common names.  This is recommended
# only for testing purposes.  For production use,
# each client should have its own certificate/key
# pair.
#
# IF YOU HAVE NOT GENERATED INDIVIDUAL
# CERTIFICATE/KEY PAIRS FOR EACH CLIENT,
# EACH HAVING ITS OWN UNIQUE "COMMON NAME",
# UNCOMMENT THIS LINE OUT.
duplicate-cn

# The keepalive directive causes ping-like
# messages to be sent back and forth over
# the link so that each side knows when
# the other side has gone down.
# Ping every 10 seconds, assume that remote
# peer is down if no ping received during
# a 120 second time period.
keepalive 10 120

# For extra security beyond that provided
# by SSL/TLS, create an "HMAC firewall"
# to help block DoS attacks and UDP port flooding.
#
# Generate with:
#   openvpn --genkey --secret ta.key
#
# The server and each client must have
# a copy of this key.
# The second parameter should be '0'
# on the server and '1' on the clients.
#tls-auth ta.key 0 # This file is secret

# Select a cryptographic cipher.
# This config item must be copied to
# the client config file as well.
# Note that v2.4 client/server will automatically
# negotiate AES-256-GCM in TLS mode.
# See also the ncp-cipher option in the manpage
#cipher AES-256-CBC

# Enable compression on the VPN link and push the
# option to the client (v2.4+ only, for earlier
# versions see below)
;compress lz4-v2
;push "compress lz4-v2"

# For compression compatible with older clients use comp-lzo
# If you enable it here, you must also
# enable it in the client config file.
;comp-lzo

# The maximum number of concurrently connected
# clients we want to allow.
;max-clients 100

# It's a good idea to reduce the OpenVPN
# daemon's privileges after initialization.
#
# You can uncomment this out on
# non-Windows systems.
;user nobody
;group nobody

# The persist options will try to avoid
# accessing certain resources on restart
# that may no longer be accessible because
# of the privilege downgrade.
persist-key
persist-tun

# Output a short status file showing
# current connections, truncated
# and rewritten every minute.
status openvpn-status.log

# By default, log messages will go to the syslog (or
# on Windows, if running as a service, they will go to
# the "\Program Files\OpenVPN\log" directory).
# Use log or log-append to override this default.
# "log" will truncate the log file on OpenVPN startup,
# while "log-append" will append to it.  Use one
# or the other (but not both).
;log         openvpn.log
;log-append  openvpn.log

# Set the appropriate level of log
# file verbosity.
#
# 0 is silent, except for fatal errors
# 4 is reasonable for general usage
# 5 and 6 can help to debug connection problems
# 9 is extremely verbose
verb 1

# Silence repeating messages.  At most 20
# sequential messages of the same message
# category will be output to the log.
;mute 20

# Notify the client that when the server restarts so it
# can automatically reconnect.
explicit-exit-notify 1



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