pppoeforlinux

1. linux怎樣建立寬頻連接

是ADSL嗎？是的話就是配置PPPOE

首先安裝RP-PPPOE
然後進行ADSL的配置，這里以3.5版的rp-pppoe為例~~~

執行/usr/sbin/adsl-setup

>>> Enter your PPPoE user name: ——此處輸入撥號帳號的用戶名
>>> Enter the Ethernet interface connected to the ADSL modem For Solaris, this is likely to be something like /dev/hme0. For Linux, it will be ethn, where n is a number. (default eth0): ——輸eth0
>>> Enter the demand value (default no): ——輸no
>>> Enter the DNS information here: ——輸入DNS伺服器的IP地址（視當地運營商的DNS伺服器IP而定）
>>> Please enter your PPPoE password: ——輸用戶口令
>>> Choose a type of firewall (0-2): ——輸0
>>> Accept these settings and adjust configuration files (y/n)? ——輸y

2. Linux 系統怎麼用電信寬頻撥號上網

（1）安裝的前提條件

<1>確保安裝了網卡並工作正常

使用命令
#ifconfig eth0
查看網卡狀態

<2>在系統中不要設置默認路由(網關),讓ADSL撥號後自動獲得

如果已經設置了默認路由,使用以下方法刪除:
在文件 /etc/sysconfig/network/ifconfig-eth0 中刪除 GATEWAY= 這一行,然後以root執行:

# service network restart

<3>已經安裝了pppd軟體包

如果存在文件 /usr/sbin/pppd,則說明已經安裝了pppd; 如果未安裝,下載安裝這個軟體包。

（2）安裝PPPOE客戶端軟體

Linux下的PPPOE客戶端軟體比較多,而且大多使用GNU License,我們推薦使用rp-pppoe
這個軟體包。從http://www.roaringpenguin.com/procts/pppoe這個網站上，不僅可以下載
各發布包下的rp-pppoe的二進制軟體包，而且可以下載源代碼軟體包。

我們使用centos下的yum安裝方法,來安裝rp-pppoe軟體包
#yum install rp-pppoe

（3）配置PPPOE客戶端軟體

<1>配置文件

安裝完軟體包後，必須配置PPPOE的配置文件/etc/ppp/pppoe.conf，從而讓ADSL撥號時使用配置文件中的用戶名、密碼等參數。

<2>命令配置
# adsl-setup ← 建立ADSL連接

Welcome to the ADSL 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): ← 填入ADSL連接的用戶名

INTERFACE

Enter the Ethernet interface connected to the ADSL 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): ← 指定網路接入設備，一塊網卡的情況下，一般為默認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，接受默認設置

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: ← 如果知道DNS伺服器的信息在此填入。不知道的情況按回車跳過

PASSWORD

Please 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

USERCTRL

Please enter 'yes' (two letters, lower-case.) if you want to allow
normal user to start or stop DSL connection (default yes): no ← 填入no，不允許一般用戶控制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，不在這里使用防火牆

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，在系統啟動時自動連接ADSL

** Summary of what you entered **

Ethernet Interface: eth0
User name: [email protected]
Activate-on-demand: No
DNS: Do not adjust
Firewalling: NONE
User Control: no
Accept these settings and adjust configuration files (y/n)? y ← 配置信息確認無誤後，鍵入y同意設置
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/adsl-status /etc/sysconfig/network-scripts/ifcfg-ppp0'
to see the link status.

（4）啟動PPPOE客戶端軟體
# adsl-start ← 啟動ADSL連接
# ← 稍等片刻後若啟動成功後出現提示符（無任何提示或Connected意味著連接成功）

如果不成功，請檢查網線、ADSL MODEM等物理設備，並查看 /var/log/messages中的信息
/usr/sbin/adsl-stop 關閉和ISP的連接
/usr/sbin/adsl-status 查看當前連接的狀態

如果想在Linux系統啟動時自動啟動ADSL連接，輸入以下命令
#chkconfig --add adsl
將在當前的運行級下加入ADSL的自啟動腳本

（5）測試
當連接成功後，使用命令 #ifconfig -a 在輸出中應該含有關於 ppp0 的一堆信息，其中還綁定了 IP 地址,說明已經從撥號中獲 得了IP地址。使用命令 #netstat -nr 查看路由表信息，這時的默認路由應該是上面獲得的IP地址。 如果沒有默認路由，我們可以手動增加： #route add default gw 上面獲得的IP地址使用命令#nslookup www.sina.com.cn 如果解析出新浪的IP，說明已經從撥號中正確獲得了DNS伺服器最後，使用命令ping某個域名或IP，如果有響應，表示你已經大功告成了。