using System;
using System.Runtime.InteropServices;

public struct RASCONN
{
  public int dwSize;
  public IntPtr hrasconn;
  [MarshalAs(UnmanagedType.ByValTStr,SizeConst = 257)]
  public string szEntryName;
  [MarshalAs(UnmanagedType.ByValTStr,SizeConst = 17)]
  public string szDeviceType;
  [MarshalAs(UnmanagedType.ByValTStr,SizeConst = 129)]
  public string szDeviceName;
}

[StructLayout(LayoutKind.Sequential,CharSet = CharSet.Auto)]
public struct Rasstats
{
  public int dwSize;
  public int dwBytesXmited;
  public int dwBytesRcved;
  public int dwFramesXmited;
  public int dwFramesRcved;
  public int dwCrcErr;
  public int dwTimeoutErr;
  public int dwAlignmentErr;
  public int dwHardwareOverrunErr;
  public int dwFramingErr;
  public int dwBufferOverrunErr;
  public int dwCompressionRatioIn;
  public int dwCompressionRatioOut;
  public int dwBps;
  public int dwConnectionDuration;
}

[StructLayout(LayoutKind.Sequential,CharSet = CharSet.Auto)]
public struct RasEntryName
{
  public int dwSize;
  //[MarshalAs(UnmanagedType.ByValTStr,SizeConst=(int)RasFieldSizeConstants.RAS_MaxEntryName + 1)]
  public string szEntryName;
  //#if WINVER5
  // public int dwFlags;
  // [MarshalAs(UnmanagedType.ByValTStr,SizeConst=260+1)]
  // public string szPhonebookPath;
  //#endif
}
public class RAS
{
  [DllImport("Rasapi32.dll",EntryPoint = "RasEnumConnectionsA",SetLastError = true)]

  internal static extern int RasEnumConnections
    (
    ref RASCONN lprasconn,// buffer to receive connections data
    ref int lpcb,// size in bytes of buffer
    ref int lpcConnections // number of connections written to buffer
    );


  [DllImport("rasapi32.dll",CharSet = CharSet.Auto)]
  internal static extern uint RasGetConnectionStatistics(
    IntPtr hRasConn,// handle to the connection
    [In,Out]Rasstats lpStatistics // buffer to receive statistics
    );
  [DllImport("rasapi32.dll",CharSet = CharSet.Auto)]
  public extern static uint RasHangUp(
    IntPtr hrasconn // handle to the RAS connection to hang up
    );

  [DllImport("rasapi32.dll",CharSet = CharSet.Auto)]
  public extern static uint RasEnumEntries(
    string reserved,// reserved,must be NULL
    string lpszPhonebook,// pointer to full path and
    // file name of phone-book file
    [In,Out]RasEntryName[] lprasentryname,// buffer to receive
    // phone-book entries
    ref int lpcb,// size in bytes of buffer
    out int lpcEntries       // number of entries written
    // to buffer
    );

  [DllImport("wininet.dll",CharSet = CharSet.Auto)]
  public extern static int InternetDial(
    IntPtr hwnd,[In]string lpszConnectoid,uint dwFlags,ref int lpdwConnection,uint dwReserved
    );

  public RAS()
  {
  }
}
public enum DEL_CACHE_TYPE //要删除的类型。
{
  File,//表示internet临时文件
  Cookie //表示Cookie
}

public class RASdisplay
{
  [DllImport("wininet.dll",CharSet = CharSet.Auto)]
  public static extern bool DeleteUrlCacheEntry(
    DEL_CACHE_TYPE type
    );
  private string m_duration;
  private string m_ConnectionName;
  private string[] m_ConnectionNames;
  private double m_TX;
  private double m_RX;
  private bool m_connected;
  private IntPtr m_ConnectedRasHandle;

  Rasstats status = new Rasstats();
  public RASdisplay()
  {
    m_connected = true;

    RAS lpras = new RAS();
    RASCONN lprasConn = new RASCONN();

    lprasConn.dwSize = Marshal.SizeOf(typeof(RASCONN));
    lprasConn.hrasconn = IntPtr.Zero;

    int lpcb = 0;
    int lpcConnections = 0;
    int nRet = 0;
    lpcb = Marshal.SizeOf(typeof(RASCONN));

    nRet = RAS.RasEnumConnections(ref lprasConn,ref lpcb,ref
      lpcConnections);

    if (nRet != 0)
    {
      m_connected = false;
      return;

    }

    if (lpcConnections > 0)
    {
      //for (int i = 0; i < lpcConnections; i++)

      //{
      Rasstats stats = new Rasstats();

      m_ConnectedRasHandle = lprasConn.hrasconn;
      RAS.RasGetConnectionStatistics(lprasConn.hrasconn,stats);


      m_ConnectionName = lprasConn.szEntryName;

      int Hours = 0;
      int Minutes = 0;
      int Seconds = 0;

      Hours = ((stats.dwConnectionDuration / 1000) / 3600);
      Minutes = ((stats.dwConnectionDuration / 1000) / 60) - (Hours * 60);
      Seconds = ((stats.dwConnectionDuration / 1000)) - (Minutes * 60) - (Hours * 3600);


      m_duration = Hours + " hours " + Minutes + " minutes " + Seconds + " secs";
      m_TX = stats.dwBytesXmited;
      m_RX = stats.dwBytesRcved;
      //}
    }
    else
    {
      m_connected = false;
    }


    int lpNames = 1;
    int entryNameSize = 0;
    int lpSize = 0;
    RasEntryName[] names = null;

    entryNameSize = Marshal.SizeOf(typeof(RasEntryName));
    lpSize = lpNames * entryNameSize;

    names = new RasEntryName[lpNames];
    names[0].dwSize = entryNameSize;

    uint retval = RAS.RasEnumEntries(null,null,names,ref lpSize,out lpNames);

    //if we have more than one connection,we need to do it again
    if (lpNames > 1)
    {
      names = new RasEntryName[lpNames];
      for (int i = 0; i < names.Length; i++)
      {
        names[i].dwSize = entryNameSize;
      }

      retval = RAS.RasEnumEntries(null,out lpNames);

    }
    m_ConnectionNames = new string[names.Length];


    if (lpNames > 0)
    {
      for (int i = 0; i < names.Length; i++)
      {
        m_ConnectionNames[i] = names[i].szEntryName;
      }
    }
  }

  public string Duration
  {
    get
    {
      return m_connected ? m_duration : "";
    }
  }

  public string[] Connections
  {
    get
    {
      return m_ConnectionNames;
    }
  }

  public double BytesTransmitted
  {
    get
    {
      return m_connected ? m_TX : 0;
    }
  }
  public double BytesReceived
  {
    get
    {
      return m_connected ? m_RX : 0;

    }
  }
  public string ConnectionName
  {
    get
    {
      return m_connected ? m_ConnectionName : "";
    }
  }
  public bool IsConnected
  {
    get
    {
      return m_connected;
    }
  }

  public int Connect(string Connection)
  {
    int temp = 0;
    uint INTERNET_AUTO_DIAL_UNATTENDED = 2;
    int retVal = RAS.InternetDial(IntPtr.Zero,Connection,INTERNET_AUTO_DIAL_UNATTENDED,ref temp,0);
    return retVal;
  }
  public void disconnect()
  {
    RAS.RasHangUp(m_ConnectedRasHandle);
  }
}

RASdisplay ras = new RASdisplay();
ras.disconnect();//断开连接
ras.Connect("ADSL");//重新拨号

SSLCertificateFile /path/to/your/certificate.crt
SSLCertificateKeyFile /path/to/your/privatekey.key

SSLCertificateChainFile /path/to/your/CA.crt

sudo service httpd restart

sudo systemctl restart httpd

curl -I https://yourwebsite.com

HTTP/2 200
...
Server: Apache
...
SSL certificate verify ok.

http://www.cnblogs.com/gotodsp/p/5513945.html

步骤概述：

1、搜寻PPPoE相关软件，本人使用的是rp-pppoe

　　yum search pppoe

2、使用yum安装rp-pppoe

　　yum install rp-pppoe -y

3、开始配置PPPoE连接

　　pppoe-setup

4、输入ISP提供的账户

5、输入以太网卡代号，默认是eth0（注：CentOS 7已不是默认eth0，自行使用ifconfig命令即可找到）

6、配置：若长时间连线，连线会被自动中断（我不干，选no）

7、配置主DNS服务器

8、配置次DNS服务器

9、两次输入账户密码以确认

10、配置普通账户是否有网络连接权限

11、配置防火墙（没有特殊需求选0就OK）

12、配置是否开机自动拨号连接

13、确认刚填写的配置信息

14、连接网络尽情享受吧！

相关命令@ 连接网络：/sbin/ifup ppp0，断开连接：/sbin/ifdown ppp0，查看网络状态：/sbin/pppoe-status

....................................... 这是华丽丽的分割线 .......................................

获取以太网卡代号

 1 [dsp@dsp Desktop]$ ifconfig
 2 enp9s0: flags=4163<UP,broADCAST,RUNNING,MULTICAST>  mtu 1500 # 有线网卡
 3         ether 20:1b:06:3d:22:05  txqueuelen 1000 (Ethernet)  4         RX packets 0  bytes 0 (0.0 B)  5         RX errors 0  dropped 2297  overruns 0  frame 0
 6         TX packets  7         TX errors 0 overruns 0  carrier 0  collisions  8         device interrupt 18  
 9 
10 lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
11         inet 127.0.0.1  netmask 255.0.0.0
12         inet6 ::1  prefixlen 128  scopeid 0x10<host>
13         loop  txqueuelen 0 (Local Loopback) 14         RX packets 2  bytes 110 (110.0 B) 15         RX errors 0  overruns 16         TX packets 17         TX errors 18 
19 virbr0: flags=4099<UP,128);font-size:12px !important;line-height:1.5 !important;">1500
20         inet 192.168.122.1  netmask 255.255.255.0  broadcast 122.255
21         ether 52:54:00:36:45:23  txqueuelen 0 (Ethernet) 22         RX packets 23         RX errors 24         TX packets 25         TX errors 26 
27 wlp8s0: flags=1500 # 无线网卡
28         inet 0.151  netmask 0.255
29         inet6 fe80::4ad2:24ff:fee8:f962  prefixlen 64  scopeid 0x20<link>
30         ether 48:d2:24:e8:f9:62  txqueuelen 31         RX packets 20017  bytes 16100210 (15.3 MiB) 32         RX errors 33         TX packets 18263  bytes 2641746 (2.5 MiB) 34         TX errors 0

配置rp-pppoe客户端

  1 [root@dsp Desktop]# pppoe-setup   2 Welcome to the PPPoE client setup.  First,I will run some checks on
  3 your system to make sure the PPPoE client is installed properly...
  4 
  5 LOGIN NAME
  6 
  7 Enter your Login Name (default dsp): 12345      　　# 网络服务提供商提供的账户
  8 
  9 INTERFACE
 10 
 11 Enter the Ethernet interface connected to the PPPoE modem
 12 For Solaris,this is likely to be something like /dev/hme0.
 13 For Linux,it will be ethX,where 'X' is a number.
 14 (default eth0): enp9s0                          　　# 选择以太网卡，有线网卡
 15 
 16 Do you want the link to come up on demand,or stay up continuously?
 17 If you want it to come up on demand,enter the idle time in seconds
 18 after which the link should be dropped.  If you want the link to
 19 stay up permanently,enter no' (two letters,lower-case.)
 20 NOTE: Demand-activated links do not interact well with dynamic IP
 21 addresses.  You may have some problems with demand-activated links.
 22 Enter the demand value (default no): no         　　# 输入no，否则若长时间连线，连线会被自动中断
 23 
 24 DNS
 25 
 26 Please enter the IP address of your ISPs primary DNS server.
 27 If your ISP claims that the server will provide dynamic DNS addresses', 28 enter server' (all lower-case) here.
 29 If you just press enter,I will assume you kNow what you are
 30 doing and not modify your DNS setup.
 31 Enter the DNS information here: 8.8.8.8         　　# 主DNS服务器IP，本人使用Google Public DNS
 32 Please enter the IP address of your ISPs secondary DNS server.
 33 If you just press enter,I will assume there is only one DNS server.
 34 Enter the secondary DNS server address here: 8.8.4.4      　　# 二级DNS服务器IP
 35 
 36 PASSWORD　　　　　　　　　　　　　　　　　　　　　　　　　# 账户对应的密码，需两次输入以确认无误
 37 
 38 Please enter your Password: 
 39 Please re-enter your Password: 
 40 
 41 USERCTRL
 42 
 43 Please enter yes' (three letters,255);line-height:1.5 !important;">case.) if you want to allow
 44 normal user to start or stop DSL connection (default yes): yes  # 普通用户是否可以启动停止网络连接
 45 
 46 FIREWALLING
 47 
 48 Please choose the firewall rules to use.  Note that these rules are
 49 very basic.  You are strongly encouraged to use a more sophisticated
 50 firewall setup; however,these will provide basic security.  If you
 51 are running any servers on your machine,you must choose NONE' and
 52 set up firewalling yourself.  Otherwise,the firewall rules will deny
 53 access to all standard servers like Web,e-mail,ftp,etc.  If you
 54 are using SSH,the rules will block outgoing SSH connections which
 55 allocate a privileged source port.
 56 
 57 The firewall choices are:
 58 0 - NONE: This script will not set any firewall rules.  You are responsible
 59           for ensuring the security of your machine.  You are STRONGLY
 60           recommended to use some kind of firewall rules.
 61 1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation
 62 2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway
 63                 for a LAN
 64 Choose a type of firewall (0-2): 0　　　　　　　　　　　　　　　# 选 0 吧
 65 
 66 Start this connection at boot time
 67 
 68 Do you want to start this connection at boot time?
 69 Please enter no or yes (default no):yes　　　　　　　　　　　　# 是否系统启动是就连接网络
 70 
 71 ** Summary of what you entered **　　　　　　　　　　　　　　　
 72 
 73 Ethernet Interface: enp9s0
 74 User name:          12345
 75 Activate-on-demand: No
 76 Primary DNS:        8.8.8.8
 77 Secondary DNS:      4.4
 78 Firewalling:        NONE
 79 User Control:       yes
 80 Accept these settings and adjust configuration files (y/n)? y　　　　# 确认刚才输入的网络配置信息
 81 Adjusting /etc/sysconfig/network-scripts/ifcfg-ppp0
 82 Adjusting /etc/resolv.conf
 83   (But first backing it up to /etc/resolv.conf.bak)
 84 Adjusting /etc/ppp/chap-secrets and /etc/ppp/pap-secrets
 85   (But first backing it up to /etc/ppp/chap-secrets.bak)
 86   (But first backing it up to /etc/ppp/pap-secrets.bak)
 87 
 88 
 89 Congratulations,it should be all set up!
 90 
 91 Type /sbin/ifup ppp0' to bring up your xDSL link and /sbin/ifdown ppp0'　# rp-pppoe的操作命令
 92 to bring it down.
 93 Type /sbin/pppoe-status /etc/sysconfig/network-scripts/ifcfg-ppp0'
 94 to see the link status.
 95 
 96 [root@dsp Desktop]# /sbin/ifup ppp0　　　　　　# 启动网络连接
 97 [root@dsp Desktop]# /sbin/pppoe-status　　　　# 查看网络连接状态
 98 pppoe-status: Link is up and running on interface ppp0
 99 6: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc pfifo_fast state UNKNowN qlen 3
100     link/ppp 
101     inet 10.198.0.17 peer 1.1/32 scope global ppp0
102        valid_lft forever preferred_lft forever