Linux下pppoe设置

原文地址：http://blog.csdn.net/liangyamin/article/details/7092358
openwrt下有ppp-2.4.5和rp-pppoe-3.11两个包（编译后分别生成pppd和pppoe-server等可执行程序）。
注：生成的pppoe-setup pppoe-start pppoe-stop pppoe-connect等脚本在rp-pppoe-3.11/scripts目录下，
pppoe.conf及pppoe-server-options等文件在rp-pppoe-3.11/configs目录下。
openwrt下未使用pppoe-setup（shell脚本，调用的usr/sbin/pppd）设置拨号上网的账号密码，而是用lib\netifd\proto\ppp.sh(类似pppoe-setup，该shell脚本中也是调的usr/sbin/pppd)。

 在Linux下配置pppoe，一般有以下步骤：

1. 安装pppoe软件。这个不多说，ape-get install pppoe即可。

2. 设置拨号属性：

root@ubuntu:~# pppoe-setup

   详细过程如下：

     用户名：

USER NAME

>>> Enter your PPPoE user name (default test): test

     接口(网卡)：

INTERFACE

>>> Enter the Ethernet interface connected to the DSL 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): eth0

      dns：

>>> Enter the DNS information here:

      密码：

PASSWORD

>>> Please enter your PPPoE password:
>>> Please re-enter your PPPoE password:

      防火墙：

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

   保存设置：

Ethernet Interface: eth0
User name:          test
Activate-on-demand: No
DNS:                Do not adjust
Firewalling:        NONE

>>> Accept these settings and adjust configuration files (y/n)? y

  保存成功了。

Congratulations, it should be all set up!

Type 'pppoe-start' to bring up your PPPoE link and 'pppoe-stop' to bring
it down.  Type 'pppoe-status' to see the link status.

3. 开始拨号

root@ubuntu:~# pppoe-start

到了这一步，如果没有问题的话，应该就可以正常连上pppoe服务器了。

 

 

但在实际操作时，我遇到了以下两个问题：

问题1：

root@ubuntu:~# pppoe-setup
Welcome to the Roaring Penguin PPPoE client setup.  First, I will run
some checks on your system to make sure the PPPoE client is installed
properly...

Oops, I can't execute the program '/usr/local/sbin/pppd'.  You
must install the PPP software suite, version 2.3.10 or later.

   原因：目录/usr/local/sbin/没有pppd文件

   解决方法：

     将/usr/sbin/pppoe-setup脚本里PPPD=/usr/local/sbin/pppd
     改为PPPD=/usr/sbin/pppd，保存修改后即恢复可正常

 

问题2：

root@ubuntu:~# pppoe-status: Link is down (can't read pppoe PID file /var/run/pppoe.conf-pppoe.pid.pppoe)

    尝试运行pppoe-connect，出现和问题一类似的错误

   原因：同问题1所述

   解决方法和问题1中类似：
     将/usr/sbin/pppoe-connect脚本里PPPD=/usr/local/sbin/pppd
     改为PPPD=/usr/sbin/pppd，保存修改后即恢复可正常

总结：

       在配置pppoe时遇到奇怪的问题，很有可能是有相应的脚本的路径设置不当造成。