centos拨号上网

1.查看装没装拨号软件：

[root@www root]# rpm -qa|grep pppoe

rp-pppoe-3.5-32.1

2.查看adsl-setup命令在哪：

[root@www root]#whereis adsl-setup

adsl-setup: /sbin/adsl-setup /usr/sbin/adsl-setup

/usr/share/man/man8/

也可以在“位置”“搜索”里搜pppoe查看更多信息。

3.设置拨号：

[root@www root]# /sbin/adsl-setup (不知道是不是我的有问题，不能直接adsl-setup,种是找不到命令)

首先，你会看到欢迎信息。

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

your system to make sure the PPPoE client is

然后要求我们输入登陆名。

LOGIN NAME

Enter your Login Name (default root): （这里填宽带连接的用户名）

接着，要求我们选择使用的网络接口。我们这时候，填入我们刚刚设置的那个网卡。对于大多数只有一个网卡的朋友而言，默认eth0就可以了。

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): （eth0）

接下来，询问的是，adsl连接以后，是否持续保持连接。或者是自动的断开，在指定的时间（以秒数计算）内。多数情况下，我们希望手动的打开关闭连接。所以这里选择默认的no。

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)

再下来，就是dns了。我发现很多时候，pppoe都不能够正确获取dns信息。我建议你输入dns地址。这些信息在isp的网站上一般都有公布。

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. (server)

帐号密码是必须，输入两次。密码显示风格和其他的地方一样，不显示在屏幕上。这个，我不知道改怎么填写。太高深的问题了。希望你将你的答案和我分享。：P。

PASSWORD

Please enter your Password: (宽带连接密码)

Please re-enter your Password:

下面的设置，是表示是否允许普通用户启用/关闭 ADSL连接。默认是允许。

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

normal user to start or stop DSL connection (default yes): (yes)

我们看下防火墙选项。这里提供的防火墙可以给你提供基本的安全保护。我不推荐你使用——你最好选择“NONE”选项。无论是什么样的用户使用，我都建议你使用额外的工具来配置防火墙规则（iptables目前看来是一个非常不错的工具）。

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)

Start this connection at boot time

是否在开机时，打开这个连接？

Do you want to start this connection at boot time?** (yes)

所有的配置信息填写完成之后，系统将给出一个报告，完整的显示出你输入的配置信息。如果，你确信你输入的配置信息是正确的，输入yes写入配置文件。输入no放弃配置。

Summary of what you entered **

Ethernet Interface: eth0

User name: root

Activate-on-demand: No

DNS: Do not adjust

Firewalling: NONE

User Control: yes

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

Please enter no or yes (default no):

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.

测试拨号

现在，我们需要测试下我们的拨号是否配置正确了。

输入ADSL-start拨号。一般情况下，我会ping 我的ISP的主WWW服务器。比如

ping

如果不怕麻烦，打开浏览器测试下，也可以。如果一切ok。那么我们就可以结束我们的配置了。

当然，你关闭连接的话，使用命令adsl-stop就可以了。

三步搞定Linux下ADSL拨号上网：

1，准备

拨号软件和USB猫ADSL的驱动（下面附件中）

2，安装

2.1 安装拨号软件，解压后有三个rpm包，

[root@localhost adsl]$ ls *.rpm

[root@localhost adsl]$ rpm -ivh *.rpm

warning: : Header V3 DSA signature: NOKEY,

key ID 4f2a6fd2

########################################### [100%]

1:linux-atm-libs########################################### [ 33%]

2:linux-atm ########################################### [ 67%]

3:linux-atm-libs-devel ########################################### [100%]

装完之后会有

[root@localhost ~]# br2684ctl

usage: br2684ctl [-b] [[-c number] [-e 0|1] [-s sndbuf] [-q qos] [-a

[itf.]]*]*

2.2 安装adsl驱动： 拷贝到/lib/firmware文件夹。

[root@localhost tmp]# cp /lib/firmware

注：如果在后面的操作中拨号不成功，很可能是这里拷贝的驱动不符合机器的实际情况，那就需要从新编译：

[root@localhost tmp]# ./cxacru-fw

[root@localhost tmp]# cp /lib/firmware

3，拨号

[root@localhost ~]# br2684ctl -b -c 0 -a 8.35 (注：这里的8.35是根据USB猫的实际型号来的)

br2684ctl[2930]: Interface "nas0" created sucessfully

br2684ctl[2930]: Communicating over ATM 0.8.35, encapsulation: LLC

br2684ctl[2930]: Interface configured

[root@localhost ~]# ifconfig

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:1759 errors:0 dropped:0 overruns:0 frame.:0

TX packets:1759 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:2706048 (2.5 MiB) TX bytes:2706048 (2.5 MiB)

[root@localhost ~]# ifconfig nas0 up

[root@localhost ~]# adsl-setup

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

your system to make sure the PPPoE client is

LOGIN NAME

Enter your Login Name (default root): *****@adsla

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): nas0

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: server

PASSWORD

Please enter your Password:

Please re-enter your Password:

USERCTRL

Please enter 'yes' (three 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): 1

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: nas0

User name: ******@adsla

Activate-on-demand: No

DNS addresses: Supplied by ISP's server

Firewalling: STANDALONE

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/)

(But first backing it up to /etc/ppp/)

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.

[root@localhost ~]# /sbin/ifup ppp0

[root@localhost ~]# ifconfig

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:1759 errors:0 dropped:0 overruns:0 frame.:0

TX packets:1759 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:2706048 (2.5 MiB) TX bytes:2706048 (2.5 MiB)

nas0 Link encap:Ethernet HWaddr 00:D0:F8:6E:FE:48

inet6 addr: fe80::2d0:f8ff:fe6e:fe48/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:10 errors:0 dropped:0 overruns:0 frame.:0

TX packets:27 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:428 (428.0 b) TX bytes:4987 (4.8 KiB)

ppp0 Link encap:Point-to-Point Protocol

inet addr:221.215.250.49 P-t-P:221.215.250.1 Mask:255.255.255.255

UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1

RX packets:3 errors:0 dropped:0 overruns:0 frame.:0

TX packets:3 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:3

RX bytes:54 (54.0 b) TX bytes:54 (54.0 b)

[root@localhost ~]# ping

PING (59.151.21.100) 56(84) bytes of data.

64 bytes from 59.151.21.100: icmp_seq=1 ttl=237 time=78.4 ms

64 bytes from 59.151.21.100: icmp_seq=2 ttl=237 time=81.8 ms

64 bytes from 59.151.21.100: icmp_seq=3 ttl=237 time=80.5 ms

64 bytes from 59.151.21.100: icmp_seq=4 ttl=237 time=78.8 ms

64 bytes from 59.151.21.100: icmp_seq=5 ttl=237 time=78.7 ms

64 bytes from 59.151.21.100: icmp_seq=6 ttl=237 time=79.7 ms

--- ping statistics ---

6 packets transmitted, 6 received, 0% packet loss, time 5038ms

rtt min/avg/max/mdev = 78.498/79.709/81.835/1.193 ms

[root@localhost ~]# dmesg |grep ATM

ATM dev 0: ADSL line: attempting to activate

ATM dev 0: ADSL line: channel analysis

ATM dev 0: ADSL line: up (2048 kb/s down | 512 kb/s up)

安装完毕，拨号成功，这样平时只要用如下脚本拨号即可：

#! /bin/bash

sudo /usr/sbin/br2684ctl -b -c 0 -a 8.35

sudo /sbin/ifconfig nas0 up

sudo /sbin/ifup ppp0

最近联通adsl设置有变，但具体对linux下驱动还没有多少影响（/temp/adsl1/），主要是修改了PPPOA封装模式（PPP ORER

ATM VCMUX RFC2364）到PPPOE模式(PPP over Ethernet LLCSNAP RFC2516 )。以上均在CentOS 5.X 里测试通过。