首先安裝好CentOS6以后要安裝rp-pppoe這個軟件，centos之前的版本所adsl-setup這個命令安裝，到centos6改了。

需要光驅內放好CentOS安裝盤

掛載光盤

#mount /dev/cdrom /media

找出文件路徑

# find /media -name rp-pppoe*

這個文件沒有依賴項，可以直接安裝

#rpm -ivh /media/CentOS_6.0_Final/Packages/rp-pppoe-3.10-8.el6.i686.rpm

安裝好以后可以開始設置ADSL和DNS信息

#pppoe-setup

Welcome to the PPPoE client setup. First, I will run some checks onyour system to make sure the PPPoE client is installed properly...The following DSL config was found on your system:Device: Name:ppp0 DSLppp0Please 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: ppp0LOGIN NAMEEnter your Login Name (default root): 中國電信或者網通給你的ADSL用戶名，注意電信給的有ad打頭INTERFACEEnter the Ethernet interface connected to the PPPoE modemFor Solaris, this is likely to be something like /dev/hme0.For Linux, it will be ethX, where X is a number.(default eth0): eth0← 指定網絡接入設備，一塊網卡的情況下，一般為默認eth0Do 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 secondsafter which the link should be dropped. If you want the link tostay up permanently, enter no (two letters, lower-case.)NOTE: Demand-activated links do not interact well with dynamic IPaddresses. You may have some problems with demand-activated links.Enter the demand value (default no): ← 直接按回車，接受默認設置，詢問的是，adsl連接以后，是否持續保持連接。或者是自動的斷開，在指定的時間（以秒數計算）內。多數情況下，我們希望手動的打開關閉連接。所以這里選擇默認的no。DNSPlease enter the IP address of your ISPs 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 aredoing and not modify your DNS setup.Enter the DNS information here: 202.96.209.5 第一個DNS建議手動設置，不然可能連不上Please enter the IP address of your ISPs 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DNS建議手動設置，不然可能連不上PASSWORDPlease enter your Password: 輸入ADSL的連接密碼Please re-enter your Password: ← 再次確認輸入ADSL的連接密碼USERCTRLPlease enter yes (three letters, lower-case.) if you want to allownormal user to start or stop DSL connection (default yes): yes← 填入no，不允許一般用戶控制PPPoE的連接FIREWALLINGPlease choose the firewall rules to use. Note that these rules arevery basic. You are strongly encouraged to use a more sophisticatedfirewall setup; however, these will provide basic security. If youare running any servers on your machine, you must choose NONE andset up firewalling yourself. Otherwise, the firewall rules will denyaccess to all standard servers like Web, e-mail, ftp, etc. If youare using SSH, the rules will block outgoing SSH connections whichallocate a privileged source port.The firewall choices are:0 - NONE: This script will not set any firewall rules. You are responsiblefor ensuring the security of your machine. You are STRONGLYrecommended to use some kind of firewall rules.1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation2 - MASQUERADE: Appropriate for a machine acting as an Internet gatewayfor a LANChoose a type of firewall (0-2): 0← 輸入0，不在這里使用防火墻Start this connection at boot timeDo you want to start this connection at boot time?Please enter no or yes (default no):yes← 填入yes，在系統啟動時自動連接ADSL 

Accept these settings and adjust configuration files (y/n)? y← 配置信息確認無誤后，鍵入y同意設置** Summary of what you entered **

Ethernet Interface:eth0

User name:

[root@localhost ~]# pppoe-start← 啟動ADSL pppoe連接

[root@localhost ~]# pppoe-status 設置完成后我們看看adsl狀態