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由于需要做网站数据的抓取，普通的固定代理会容易被封禁，所以我们就用PPPOE通过动态拨号换不同的IP地址来解决该问题，下面PPPOE设置的整个方法过程：
移除NetworkManager安装rp-pppoe
第一步 搜寻pppoe可以找到pppoe相关套件，我们要使用的是rp-pppoe。
yum search pppoe
第二步 使用yum安装rp-pppoe。
yum install rp-pppoe -y
第三步 移除NetworkManaget。
yum erase NetworkManager
第四步 开始配置PPPoE连线。
root@PppoeServer Test ~ # 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...
LOGIN NAME ＃需要输入在运营商处购买的宽带账号
Enter your Login Name (default root): 680000038162
INTERFACE ＃选择关联网卡，默认为eth0可能由于安装多张网卡而非eth0，这个需要根据自己的实际情况而定
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): em2
Do you want the link to come up on demand, or stay up continuously? ＃拨号类型选择，取决于自己所选套餐，默认为no
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
DNS ＃DNS的配置，如果你知道可以手动输入，如果不知道可以输入Server，让ISP自动分配
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.
Enter the DNS information here: 202.106.0.20
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
PASSWORD ＃宽带的密码
Please enter your Password:
Please re-enter your Password:
USERCTRL ＃ 用户控制，是否允许普通用户控制账号的连接与断开
Please enter ‘yes‘ (three letters, lower-case.) if you want to allow
normal user to start or stop DSL connection (default yes): no
FIREWALLING ＃ 防火墙配置，这里默认0就好
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
Start this connection at boot time
Do you want to start this connection at boot time? ＃ 是否开机启动，这里选择yes
Please enter no or yes (default no):yes
** Summary of what you entered **
Ethernet Interface: em2
User name: 680000038162
Activate-on-demand: No
Primary DNS: 202.106.0.20
Secondary DNS: 8.8.8.8
Firewalling: NONE
User Control: no
Accept these settings and adjust configuration files (y/n)? ＃ 确认上面配置无误后，保存配置到文件
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! ＃ 操作方法，启动、停止宽带的连接
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.
root@PppoeServer Test ~ # ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether f0:1f:af:d6:01:61 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.252/24 brd 192.168.1.255 scope global em1
valid_lft forever preferred_lft forever
3: em2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether f0:1f:af:d6:01:62 brd ff:ff:ff:ff:ff:ff
4: p2p1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether a0:36:9f:94:a4:d8 brd ff:ff:ff:ff:ff:ff
5: p2p2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether a0:36:9f:94:a4:da brd ff:ff:ff:ff:ff:ff
root@PppoeServer Test ~ # ifup ppp0
root@PppoeServer Test ~ # pppoe-status
pppoe-status: Link is up and running on interface ppp0
6: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc pfifo_fast state UNKNOWN qlen 3
link/ppp
inet 114.252.45.64 peer 114.252.32.1/32 scope global ppp0
valid_lft forever preferred_lft forever
root@PppoeServer Test ~ # ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether f0:1f:af:d6:01:61 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.252/24 brd 192.168.1.255 scope global em1
valid_lft forever preferred_lft forever
3: em2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether f0:1f:af:d6:01:62 brd ff:ff:ff:ff:ff:ff
4: p2p1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether a0:36:9f:94:a4:d8 brd ff:ff:ff:ff:ff:ff
5: p2p2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000
link/ether a0:36:9f:94:a4:da brd ff:ff:ff:ff:ff:ff
6: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc pfifo_fast state UNKNOWN qlen 3
link/ppp
inet 114.252.45.64 peer 114.252.32.1/32 scope global ppp0
valid_lft forever preferred_lft forever
上面是整个PPPOE的连接创建过程，后续可以通过ifdown ppp0和pppoe-status来进行停止连接和状态查看。
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原文地址：http://www.cnblogs.com/Ctry/p/5152246.html
