CentOS 安裝 PPPoE 網路連線套件 rp-pppoe

由於 NetworkManager 的問題實在很多，也遇到有時候連線失敗的問題，用來一般使用可能還好，作為伺服器的用途的話，穩定性實在令人擔憂，因此還是決定把NetworkManager移除掉，改安裝最原始的文字介面的 rp-pppoe 吧。

為了避免 NetworkManager 和 rp-pppoe 發生衝突，自己是只留一套運作，但是在移除NetworkManager 之前，記得先把 rp-pppoe 安裝好，否則沒網路當然就沒辦法下載套件了。

可以透過yum搜索功能，尋找 pppoe 的相關套件，可以找到 rp-pppoe

# yum search pppoe

# yum install rp-pppoe





安裝好後，先把 NetworkManager 移除掉

# yum erase NetworkManager

移除後開始設定 rp-pppoe，接下來會出現對話式的設定文字介面，照著輸入即可完成設定

# pppoe-setup
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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): xxxxxxxx@ip.hinet.net 
這裡輸入您的連線帳號，若是中華電信的用戶，則會出現 @ 及後面那一段
 ip.hinet.net 或者是 hinet.net（前者是取得固定IP，後者是取得浮動IP）

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
這裡輸入連接到數據機的網路卡介面，因為筆者只有一張網卡，所以預設就行了

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):no
選擇no保持連線

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: 168.95.1.1 請填寫根據您網路廠商提供的 DNS 伺服器位址
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: 168.95.192.2 一般來說會有兩組不同的 DNS

PASSWORD

Please enter your Password: 輸入連線的密碼（在這裡輸入過程不會出現星號）
Please re-enter your Password: 重覆再輸入一次

USERCTRL

Please enter 'yes' (three letters, lower-case.) if you want to allow
normal user to start or stop DSL connection (default yes): no 不要讓一般使用者去控制連線

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 暫時先選0，防火牆的部分由我們手動設定

Start this connection at boot time

Do you want to start this connection at boot time?
Please enter no or yes (default no):yes 開機時自動連線

** Summary of what you entered **

Ethernet Interface: eth0
User name:          xxxxxxxx@ip.hinet.net
Activate-on-demand: No
Primary DNS:        168.95.1.1
Secondary DNS:      168.95.192.2
Firewalling:        NONE
User Control:       no
Accept these settings and adjust configuration files (y/n)? y 核對資料無誤按 y
Adjusting /etc/sysconfig/network-scripts/ifcfg-ppp0
Adjusting /etc/resolv.conf
  (But first backing it up to /etc/resolv.conf.bak)
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.

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這樣就完成了設定！

# /sbin/ifup ppp0 連線
# /sbin/ifdown ppp0 斷線
# /sbin/pppoe-status 檢查目前狀態

如果是以 Minimal 的方式安裝的 CentOS，安裝好後沒有視窗介面，當然也沒有 NetworkManager，只能先利用光碟內或者上網自行下載套件後用隨身碟複製過去安裝了

這裡使用CentOS光碟的範例來說明：

# mount /dev/cdrom /mnt
# cd /mnt/Packages
# rpm -ivh rp-pppoe* ppp* libpcap*

由於rp-pppoe缺少一些相依套件，要順便一起安裝ppp及libpcap

安裝成功後一樣依照上面的設定跑一遍即可，也可以先測試看看重開機是否會自動連線。