CentOS6以后要安裝rp-pppoe這個(gè)軟件，centos之前的版本是adsl-setup命令安裝。

（1）查看是否安裝

#rpm -qa|grep rp-pppoe

沒(méi)有內(nèi)容輸出則沒(méi)安裝，若可以聯(lián)網(wǎng)使用# yum install rp-pppoe 

無(wú)法聯(lián)網(wǎng)則：CentOS安裝盤(pán)放入光驅(qū)

掛載光盤(pán)

#mount /dev/cdrom /media

找出文件路徑

# find /media -name 'rp-pppoe*'

這個(gè)文件沒(méi)有依賴(lài)項(xiàng)，可以直接安裝

#rpm -ivh /media/CentOS_6.5_Final/Packages/rp-pppoe-3.10-8.el6.i686.rpm

（2）設(shè)置撥號(hào)

#whereis pppoe-setup

#/sbin/pppoe-setup

或#pppoe-setup

開(kāi)始設(shè)置ADSL和DNS信息：

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

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

The following DSL config was found on your system:

Device:      Name:

ppp0         DSLppp0

Please enter the device if you want to configure the present DSL config

(default ppp0) or enter 'n' if you want to create a new one: ppp0

LOGIN NAME

Enter your Login Name (default root): 中國(guó)電信或者網(wǎng)通給你的ADSL用戶(hù)名，注意電信給的有ad打頭

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← 指定網(wǎng)絡(luò)接入設(shè)備，一塊網(wǎng)卡的情況下，一般為默認(rèn)eth0

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): ← 直接按回車(chē)，接受默認(rèn)設(shè)置，詢(xún)問(wèn)的是，adsl連接以后，是否持續(xù)保持連接。或者是自動(dòng)的斷開(kāi)，在指定的時(shí)間（以秒數(shù)計(jì)算）內(nèi)。多數(shù)情況下，我們希望手動(dòng)的打開(kāi)關(guān)閉連接。所以這里選擇默認(rèn)的no。

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.

Enter the DNS information here: 202.96.209.5 第一個(gè)DNS建議手動(dòng)設(shè)置，不然可能連不上（或Enter the DNS information here: server      //PPPOE撥號(hào)的輸入server即可，即動(dòng)態(tài)獲得DNS）

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: 202.96.209.133 第二個(gè)DNS建議手動(dòng)設(shè)置，不然可能連不上

PASSWORD

Please enter your Password: 輸入ADSL的連接密碼

Please re-enter your Password: ← 再次確認(rèn)輸入ADSL的連接密碼

USERCTRL

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

normal user to start or stop DSL connection (default yes): yes← 填入no，不允許一般用戶(hù)控制PPPoE的連接

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← 輸入0，不在這里使用防火墻

Start this connection at boot time

Do you want to start this connection at boot time?

Please enter no or yes (default no):yes← 填入yes，在系統(tǒng)啟動(dòng)時(shí)自動(dòng)連接ADSL

Accept these settings and adjust configuration files (y/n)? y← 配置信息確認(rèn)無(wú)誤后，鍵入y同意設(shè)置

** Summary of what you entered **

Ethernet Interface:eth0

User name:

[root@localhost ~]# pppoe-start← 啟動(dòng)ADSL pppoe連接（或# ifup ppp0  //啟動(dòng)ppp0接口）

[root@localhost ~]# pppoe-status 設(shè)置完成后我們看看adsl狀態(tài)