linux下adsl拔號與共享上網(wǎng) -電腦資料

　　多臺電腦通過ADSL同時上網(wǎng)，如果有路由，那就太簡單了，

linux下adsl拔號與共享上網(wǎng)

　　1、用雙網(wǎng)卡（一個接內(nèi)網(wǎng)，一個接外網(wǎng)）的機器裝代理服務器軟件（windows下有winGet等）來完成，但這種方法要兩塊網(wǎng)卡（浪費）,同時還要裝代理軟件（煩，而且還會被打盜版）。

　　2、通過共享拔號連接來解決，這種方法很簡單且不需要其它的軟件。

　　對于windows下的第二種方法的實現(xiàn)網(wǎng)上有很文章且很簡單，在此不作闡述。

　　下面就我在linux(在centOS4.4,rhel as 4,fc5下測試通過)下如何通過adsl拔號與共享上網(wǎng)作一個簡單的記錄，希望對新手有所幫助。

　　1、拔號上網(wǎng)

　　1.1拔號軟件

　　linux下的拔號軟件很多，但比較好的是rp-pppoe,一般linux系統(tǒng)會自帶拔號軟件，如果你沒裝，請自己到google去找一個來裝上。

　　1.2拔號設置

　　切換為root用戶,只有root才能配置。

　　$ su

　　Password:

　　# /sbin/adsl-setup

　　按提示設置用戶名、密碼、DNS、及其它相關信息，下面是我的參考配置:

　　Welcome to the ADSL client setup. First, I will run some checks on

　　your system to make sure the PPPoE client is installed properly...

　　The following DSL config was found on your system:

　　Device: Name:

　　ppp0 DSLppp0

　　Please 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:

　　LOGIN NAME

　　Enter your Login Name (default xyn0699647):

　　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):

　　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):

　　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:

　　PASSWORD

　　Please enter your Password:

　　Please re-enter your Password:

　　USERCTRL

　　Please enter 'yes' (two letters, lower-case.) if you want to allow

　　normal user to start or stop DSL connection (default 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

　　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):

　　Please enter a number from 0 to 2

　　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

　　Start this connection at boot time

　　Do you want to start this connection at boot time?

　　Please enter no or yes (default no):

　　** Summary of what you entered **

　　Ethernet Interface: eth0

　　User name: xyn0699647

　　Activate-on-demand: No

　　DNS: Do not adjust

　　Firewalling: NONE

　　User Control: yes

　　Accept these settings and adjust configuration files (y/n)? 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/adsl-status /etc/sysconfig/network-scripts/ifcfg-ppp0'

　　to see the link status.

　　1.3拔號連接與斷開

　　輸入 '/sbin/ifup ppp0' 進行拔號連接？？'/sbin/ifdown ppp0'斷開拔號連接，

電腦資料

　　至此，如果一切正常，你就可以正常網(wǎng)上沖浪！

　　2、共享上網(wǎng)

　　通過上面的設置，你只能自己上網(wǎng)，要想其它電腦共享linux的連接上網(wǎng),需要作如下的設置。