我用的是电信 8M 宽带，联网也费了很大劲。将CentOS 6.4网络配置过程记录下来。以下全是以root权限执行的。在命令行中输入su 回车输入root密码就能用root权限了。
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首先将光盘1 放入光驱，启动之后，执行如下命令：
mount /dev/cdrom /mnt
cd /mnt
rpm -ivh ppp* rp-pppo*
安装好了之后 继续往下
[root@localhost ~]# pppoe-setup ---------------这里开始安装PPPOE
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
Enter your Login Name (default root): xy170638010214 ---------------这里键入上网拨号的帐号
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): ---------------这里按回车键（这里的话要注意选对网卡，如果你是通过网线链接电脑上网的，那么你就选择 eth0 ，但是如果你使用无线链接 路由器的 那么选择 wlan0 ，我刚开始没有选对网卡，导致最后执行 adsl-start 的时候 报错提示/usr/sbin/adsl-start: line 217: 4044 Terminated $CONNECT "$@" > /dev/null 2>&1 ,其中 的4044 貌似每次都在变，有的是后是3907 。大家要注意啊。）
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): ---------------这里按回车键
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 areppp
doing and not modify your DNS setup.
Enter the DNS information here: ---------------这里键入 server 也就是自动获得DNS
PASSWORD
Please enter your Password: ---------------这
里键入上网拨号密码
Please re-enter your Password: ---------------这里键入上网拨号密码
USERCTRL
Please enter 'yes' (three letters, lower-case.) if you want to allow
normal user to start or stop DSL connection (default yes): ---------------这里键入 yes
FIREWALLING
Please choose the firewall rules to use. Note that these rules are
very basic. You are strongly encouraged to use a more sophisticated NTHQB198529CFO
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 ---------------这里键入 0
Start this connection at boot time
Do you want to start this connection at boot time?
Please enter no or yes (default no):y ---------------这里键入 y
** Summary of what you entered **
Ethernet Interface: eth0
User name: xy170638010214
Activate-on-demand: No
DNS addresses: Supplied by ISP's server
Firewalling: NONE
User Control: yes
Accept these settings and adjust configuration files (y/n)? y ---------------这里键入 y
Adjusting /etc/sysconfig/network-scripts/ifcfg-ppp0
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.
[root@localhost ~]# pppoe-start ---------------激活PPPOE设备，成功后会自动返回
[root@localhost ~]# （出现这个说明链接成功。不成功会报错的。）
[root@localhost ~]# pppoe-status ---------------查看PPPOE状态
pppoe-status: Link is up and running on interface ppp0
6: ppp0: mtu 1492 qdisc pfifo_fast state UNKNOWN qlen 3
link/ppp
inet 113.14.36.24 peer 113.14.32.1/32 scope global ppp0 ---------------这里有IP分配给你了，可以知道你已经成功登录这个帐号了。我们ping下百度IP看看通了，所以可以上网咯。
[root@localhost ~]# ping 121.14.88.14
PING 121.14.88.14 (121.14.88.14) 56(84) bytes of data.
64 bytes from 121.14.88.14: icmp_seq=1 ttl=54 time=17.7 ms
64 bytes from 121.14.88.14: icmp_seq=2 ttl=54 time=17.7 ms
64 bytes from 121.14.88.14: icmp_seq=3 ttl=54 time=17.6 ms
64 bytes from 121.14.88.14: icmp_seq=4 ttl=54 time=17.7 ms
64 bytes from 121.14.88.14: icmp_seq=5 ttl=54 time=17.7 ms
^C64 bytes from 121.14.88.14: icmp_seq=6 ttl=54 time=17.6 ms
64 bytes from 121.14.88.14: icmp_seq=7 ttl=54 time=17.7 ms
64 bytes from 121.14.88.14: icmp_seq=8 ttl=54 time=17.6 ms
64 bytes from 121.14.88.14: icmp_seq=9 ttl=54 time=17.7 ms
64 bytes from 121.14.88.14: icmp_seq=10 ttl=54 time=17.7 ms
64 bytes from 121.14.88.14: icmp_seq=11 ttl=54 time=17.7 ms
64 bytes from 121.14.88.14: icmp_seq=12 ttl=54 time=17.7 ms
^C64 bytes from 121.14.88.14: icmp_seq=13 ttl=54 time=18.1 ms
64 bytes from 121.14.88.14: icmp_seq=14 ttl=54 time=17.6 ms
64 bytes from 121.14.88.14: icmp_seq=15 ttl=54 time=17.6 ms
^C^X64 bytes from 121.14.88.14: icmp_seq=16 ttl=54 time=17.6 ms
^X^C
--- 121.14.88.14 ping statistics ---
16 packets transmitted, 16 received, 0% packet loss, time 15895ms
rtt min/avg/max/mdev = 17.675/17.744/18.170/0.175 ms
[root@localhost ~]# pppoe-status
pppoe-status: Link is up and running on interface ppp0
6: ppp0: mtu 1492 qdisc pfifo_fast state UNKNOWN qlen 3
link/ppp
inet 113.14.36.24 peer 113.14.32.1/32 scope global ppp0
[root@localhost ~]#
以下是对PPPOE的基本操作
使用:
拨号上网 pppoe-start
段开上网 pppoe-stop
查看状态 pppoe-status