当安装完centos7后要想实现在主机上拨号上网，首先就需要在主机上安装拨号程序，rp-pppoe-3.10-10.el6.i686.rpm，这是光盘上自带的，可以自行搭建本地YUM源仓库进行安装。

首先是安装拨号软件：

[root@ wangdun ~]# yum install rp-pppoe -y

使用pppoe-setup进行交互式配置：

[root@ wangdun ~]# pppoe-setup

-------------------------------------------------------------------------------

Welcome to the PPPoE client setup. First, I will run some checks on

your system to make sure the PPPoE client is installed properly…

#这里请输入宽带账号

LOGIN NAME

Enter your Login Name (default root):wangdun

#这里请指定与modem相连接的网卡名称，我的是eth0。

#有的是多网卡的机器，一定要注意拨号网卡的序号

INTERFACE

Enter the Ethernet interface connected to the PPPoE modem

For Solaris, this is likely to be something like /dev/hme0.

For Linux, it will be ethX, where ‘X’ is a number.

(default eth0):eth0

#是否使用空闲断开？我选择NO，默认也是NO

Do you want the link to come up on demand, or stay up continuously?

If you want it to come up on demand, enter the idle time in seconds

after which the link should be dropped. If you want the link to

stay up permanently, enter ‘no’ (two letters, lower-case.)

NOTE: Demand-activated links do not interact well with dynamic IP

addresses. You may have some problems with demand-activated links.

Enter the demand value (default no): no

#设置DNS服务器地址

DNS

Please enter the IP address of your ISP’s primary DNS server.

If your ISP claims that ‘the server will provide dynamic DNS addresses’,

enter ‘server’ (all lower-case) here.

If you just press enter, I will assume you know what you are

doing and not modify your DNS setup.

#DNS1服务器地址，有个人DNS服务器的推荐填个人的，没有就填公用的。

#个人建议使用DNS服务器：114.114.114.114

Enter the DNS information here:114.114.114.114

#DNS2服务器地址，我没有冗余的DNS服务器，也不想用公共DNS，所以我留空

#个人建议使用DNS服务器：8.8.8.8

Please enter the IP address of your ISP’s secondary DNS server.

If you just press enter, I will assume there is only one DNS server.

Enter the secondary DNS server address here: 8.8.8.8

#这里请输入宽带密码，要注意的是输入的时候并不会显示字符。按顺序输入然后回车即可

PASSWORD

Please enter your Password:

Please re-enter your Password:

#是否允许普通用户打开和关闭DSL连接？

#如果你担心安全问题，请设为no。仅能用root用户连接或断开

USERCTRL

Please enter ‘yes’ (three letters, lower-case.) if you want to allow

normal user to start or stop DSL connection (default yes):yes

#防火墙，我的网络使用iptables控制，这里的防火墙我选择0关闭

FIREWALLING

Please choose the firewall rules to use. Note that these rules are

very basic. You are strongly encouraged to use a more sophisticated

firewall setup; however, these will provide basic security. If you

are running any servers on your machine, you must choose ‘NONE’ and

set up firewalling yourself. Otherwise, the firewall rules will deny

access to all standard servers like Web, e-mail, ftp, etc. If you

are using SSH, the rules will block outgoing SSH connections which

allocate a privileged source port.

The firewall choices are:

0 - NONE: This script will not set any firewall rules. You are responsible

for ensuring the security of your machine. You are STRONGLY

recommended to use some kind of firewall rules.

1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation

2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway

for a LAN

Choose a type of firewall (0-2): 0

#启动系统开机自动连接

#我选择yes

Start this connection at boot time

Do you want to start this connection at boot time?

Please enter no or yes (default no):yes

#确认上面设置的内容

** Summary of what you entered **

Ethernet Interface: eth0

User name: wangdun

Activate-on-demand: No

Primary DNS: 10.1.1.1

Firewalling: NONE

User Control: yes

Accept these settings and adjust configuration files (y/n)?y

Adjusting /etc/sysconfig/network-scripts/ifcfg-ppp0

Adjusting /etc/resolv.conf

(But first backing it up to /etc/resolv.conf.bak)

Adjusting /etc/ppp/chap-secrets and /etc/ppp/pap-secrets

(But first backing it up to /etc/ppp/chap-secrets.bak)

(But first backing it up to /etc/ppp/pap-secrets.bak)

Congratulations, it should be all set up!

Type ‘/sbin/ifup ppp0’ to bring up your xDSL link and ‘/sbin/ifdown ppp0’

to bring it down.

Type ‘/sbin/pppoe-status /etc/sysconfig/network-scripts/ifcfg-ppp0’

to see the link status.

-------------------------------------------------------------------------------

启动 | 状态 | 使用

通过以下命令即可启动：

[root@ wangdun ~]# pppoe-start

通过以下命令查看状态：

[root@wangdun ~]# pppoe-status

成功拨号后即可上网，默认路由就是ppp0接口。

测试可以通过：

[root@wangdun ~]#ping www.plaidc.com