CentOS 7拨号上网（ADSL & PPPoE）

 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 0  bytes 0 (0.0 B)
 7         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 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  dropped 0  overruns 0  frame 0
16         TX packets 2  bytes 110 (110.0 B)
17         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
18 
19 virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
20         inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
21         ether 52:54:00:36:45:23  txqueuelen 0  (Ethernet)
22         RX packets 0  bytes 0 (0.0 B)
23         RX errors 0  dropped 0  overruns 0  frame 0
24         TX packets 0  bytes 0 (0.0 B)
25         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
26 
27 wlp8s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500                 # 无线网卡
28         inet 192.168.0.151  netmask 255.255.255.0  broadcast 192.168.0.255
29         inet6 fe80::4ad2:24ff:fee8:f962  prefixlen 64  scopeid 0x20<link>
30         ether 48:d2:24:e8:f9:62  txqueuelen 1000  (Ethernet)
31         RX packets 20017  bytes 16100210 (15.3 MiB)
32         RX errors 0  dropped 0  overruns 0  frame 0
33         TX packets 18263  bytes 2641746 (2.5 MiB)
34         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

  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 ISP's 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 ISP's 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, lower-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:      8.8.4.4
 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 10.198.1.1/32 scope global ppp0
102        valid_lft forever preferred_lft forever